{"product_id":"oso-optima-ogc300-combined-heat-pump-cylinder-buffer-tank-225l-dhw-65l-buffer","title":"OSO Optima OGC300 Combined Heat Pump Cylinder \u0026 Buffer Tank | 225L DHW + 65L Buffer","description":"\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn #e65100 | Blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.25rem; }\n.qh-pd .badge { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 4px;\n  padding: 3px 10px; letter-spacing: 0.05em; text-transform: uppercase; }\n.qh-pd .b-teal    { background: #008377; color: #fff; }\n.qh-pd .b-dark    { background: #005f55; color: #fff; }\n.qh-pd .b-amber   { background: #f4a921; color: #1a1a1a; }\n.qh-pd .b-grey    { background: #555;    color: #fff; }\n.qh-pd .b-blue    { background: #1565c0; color: #fff; }\n.qh-pd .b-outline { background: transparent; color: #008377; border: 1.5px solid #008377; }\n\n ── Section label ── ,\n.qh-pd .section-label {\n  font-size: 10.5px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;\n  color: #008377; margin-bottom: 0.55rem; margin-top: 1.7rem;\n  padding-bottom: 4px; border-bottom: 2px solid #008377; }\n\n ── Intro text ── ,\n.qh-pd .prod-desc { font-size: 15.5px; color: #2a2a2a; margin-bottom: 1.4rem; line-height: 1.8; }\n.qh-pd .prod-desc strong { color: #005f55; }\n\n ── Feature list ── ,\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 5px 0 5px 22px; position: relative; font-size: 15px; line-height: 1.65; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n Bold hook styling — inherits from inline \u003cstrong\u003e ,\n.qh-pd .feat-list li strong { color: #005f55; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 420px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n\n ── Split spec table (DHW vs Buffer) ── ,\n.qh-pd .spec-table thead th.col-dhw  { background: #007a6e; }\n.qh-pd .spec-table thead th.col-buf  { background: #3a7c73; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Benefit strip (4-column) ── ,\n.qh-pd .benefit-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(145px,1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .benefit-card { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.75rem 0.9rem; font-size: 13px; line-height: 1.5; }\n.qh-pd .benefit-card .bc-title { font-weight: 800; font-size: 13.5px; color: #7fe8df;\n  margin-bottom: 0.25rem; text-transform: uppercase; letter-spacing: 0.04em; }\n\n ── Adv pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\n\u003c!-- BADGES --\u003e\n\u003cdiv class=\"badge-row\"\u003e\n  \u003cspan class=\"badge b-teal\"\u003eHeat Pump Cylinder\u003c\/span\u003e\n  \u003cspan class=\"badge b-dark\"\u003e225L DHW + 65L Buffer\u003c\/span\u003e\n  \u003cspan class=\"badge b-amber\"\u003eSingle Footprint\u003c\/span\u003e\n  \u003cspan class=\"badge b-teal\"\u003eEnergy Rating A\/A\u003c\/span\u003e\n  \u003cspan class=\"badge b-blue\"\u003e36.5 kW Coil Output\u003c\/span\u003e\n  \u003cspan class=\"badge b-grey\"\u003eUp to 15 kW Heat Pump\u003c\/span\u003e\n  \u003cspan class=\"badge b-outline\"\u003e10-Year Warranty\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003c!-- INTRO --\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO Optima OGC300 is a unique \u003cstrong\u003ecombined domestic hot water cylinder and buffer\/volumiser tank in a single footprint\u003c\/strong\u003e, purpose-built for air source and ground source heat pump installations. Rather than requiring a separate cylinder and buffer tank with linking pipework between them, the OGC300 integrates a \u003cstrong\u003e225-litre DHW cylinder (upper section)\u003c\/strong\u003e and a \u003cstrong\u003e65-litre buffer\/volumiser vessel (lower section)\u003c\/strong\u003e within a single insulated stainless steel casing, 595mm in diameter and 1,776mm tall. This dramatically reduces the space, pipework, and labour required compared to a conventional two-tank heat pump system. The buffer pre-heats the DHW cylinder continuously, which keeps the heat pump's Coefficient of Performance (COP) high by maintaining a steady load. When domestic hot water is called for, the heat pump reaches the required temperature faster because the cylinder is never fully cold — reducing the time the property is deprived of space heating during DHW mode. The OGC300 can serve heat pumps up to 15 kW output, supports a 36.5 kW rated coil, and is backed by a \u003cstrong\u003e10-year cylinder warranty\u003c\/strong\u003e. A 2.8 kW INCOTEC backup immersion heater — connectable to solar PV — provides supplementary DHW heating when required.\u003c\/p\u003e\n\n\u003c!-- 4-CARD BENEFIT STRIP --\u003e\n\u003cdiv class=\"section-label\"\u003eThe Four Key Advantages\u003c\/div\u003e\n\u003cdiv class=\"benefit-strip\"\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eSpace Saving\u003c\/div\u003e\n    One unit replaces a separate cylinder and buffer tank — halving the footprint and eliminating inter-tank pipework.\n  \u003c\/div\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eCost Saving\u003c\/div\u003e\n    Lower installation cost than buying two separate tanks, less labour, fewer fittings, and simpler pipework routing.\n  \u003c\/div\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eHigher Efficiency\u003c\/div\u003e\n    Buffer pre-heating keeps the heat pump COP high and reduces heat loss from exposed inter-tank pipework.\n  \u003c\/div\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eGreater Comfort\u003c\/div\u003e\n    Pre-warmed DHW cylinder means shorter DHW-mode cycles — less time without space heating, faster hot water delivery.\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- KEY FEATURES --\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle-footprint, two-tank design\u003c\/strong\u003e — 225L DHW cylinder and 65L buffer\/volumiser in one 595mm diameter unit, eliminating a separate buffer tank and all the pipework between them\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePre-heating keeps COP high\u003c\/strong\u003e — the buffer continuously pre-warms the DHW cylinder, maintaining a steady heat pump load, avoiding cold-start efficiency losses and preserving the optimal Coefficient of Performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShorter DHW-mode cycles\u003c\/strong\u003e — because the cylinder is never fully cold, the heat pump reaches the required DHW temperature faster, reducing the time the property goes without space heating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with heat pumps up to 15 kW\u003c\/strong\u003e — suitable for the majority of domestic ASHP and GSHP systems currently installed in the UK\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e36.5 kW rated heating coil\u003c\/strong\u003e — high-capacity primary coil for fast heat-up and recovery (19-minute heat-up from 10°C; 13-minute 70% recovery time)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e355-litre effective hot water capacity at 40°C\u003c\/strong\u003e — significantly more usable hot water than the nominal 225L cylinder volume, thanks to OSO's high-temperature stratification\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual A energy ratings\u003c\/strong\u003e — both DHW cylinder (upper) and buffer (lower) achieve ErP A class, supporting Building Regulations compliance and SAP calculations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2.8 kW INCOTEC backup immersion heater\u003c\/strong\u003e — provides DHW boost or backup when the heat pump is in maintenance, service, or defrost mode; connectable to solar PV for maximum self-consumption\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSolar PV ready\u003c\/strong\u003e — immersion heater position allows 100% of the DHW cylinder to be heated from solar PV or mains, maximising renewable self-consumption\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNANOPUR + VIP insulation\u003c\/strong\u003e — combination of PUR foam and Vacuum Insulation Panels (VIP) for exceptional standby heat retention, achieving just 45W \/ 1.08 kWh per day (DHW) and 20W \/ 0.74 kWh per day (buffer)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eULTRAWELD stainless steel construction\u003c\/strong\u003e — laser-welded Duplex stainless steel cylinder resists corrosion in all water conditions; 10-year cylinder warranty\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eS-DESIGN hidden connections\u003c\/strong\u003e — all pipework connections are concealed, keeping the plant room installation clean and professional\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated G3 Building Regulations kit\u003c\/strong\u003e — 18L expansion vessel, inlet control valve (strainer, PRV, expansion relief), and tundish all factory-fitted, simplifying compliance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeparate pressure circuits\u003c\/strong\u003e — upper DHW cylinder rated to 10 bar; lower buffer circuit rated to 2.5 bar (0.20 MPa), correctly matched to heat pump system pressures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature sensor slots\u003c\/strong\u003e — two sensor pockets (6mm and 8mm) pre-fitted for heat pump controller compatibility, supporting most ASHP and GSHP control systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTARIFF-READY immersion\u003c\/strong\u003e — backup immersion heater can be connected to off-peak electricity tariffs for cost-effective DHW top-up\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- TECHNOLOGY PILLS --\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n  \u003cspan class=\"adv-pill\"\u003eS-DESIGN — All Connections Hidden\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eNANOPUR + VIP — Premium Insulation\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eINCOTEC — Hard Water Durability\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eTARIFF-READY — Solar \u0026amp; Off-Peak Compatible\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003c!-- WHAT'S INCLUDED --\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n  \u003cdiv class=\"box-item\"\u003eOGC300 combined cylinder\/buffer unit\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003e2.8 kW INCOTEC immersion heater (factory-fitted)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eT\u0026amp;P safety valve — 7 bar \/ 90–95°C (factory-fitted)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003e18L expansion vessel (factory-fitted)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eG3 inlet group kit (strainer, PRV, expansion relief)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eSafety cut-out — upper and lower circuits\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eTemperature sensor pockets × 2 (6mm \u0026amp; 8mm)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eAdjustable feet (factory-fitted, 0–40mm range)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eStrain relievers × 2\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eInstallation \u0026amp; commissioning manual\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eService \u0026amp; commissioning logbook\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- HOW IT WORKS --\u003e\n\u003cdiv class=\"section-label\"\u003eHow the OGC300 Works with a Heat Pump\u003c\/div\u003e\n\u003cdiv class=\"callout callout-teal\"\u003e\n  ℹ️ \u003cstrong\u003eTwo vessels, one system:\u003c\/strong\u003e The lower 65L buffer acts as the heat pump's primary thermal store — absorbing heat from the pump and smoothing out cycling. The upper 225L DHW vessel is pre-warmed by the buffer through its internal coil, so it's never starting from cold when the household calls for hot water. When the heat pump switches into DHW mode via its three-way valve, the cylinder reaches temperature quickly — and space heating resumes sooner.\n\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHeat pump runs in space heating mode:\u003c\/strong\u003e Heat is circulated through the lower buffer vessel, maintaining it at heat pump flow temperature. The buffer is slowly pre-heating the DHW cylinder via the internal coil.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eDHW demand is triggered\u003c\/strong\u003e (by timer or temperature drop): The heat pump's three-way valve diverts flow into dedicated DHW mode, now heating the pre-warmed DHW cylinder via the primary coil. Because the cylinder is already partially warm, this cycle is significantly shorter than with a cold cylinder.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eDHW cylinder reaches setpoint:\u003c\/strong\u003e The heat pump returns to space heating mode. The shorter DHW cycle means less time the property goes without space heating — improving comfort, particularly in colder weather.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eBackup immersion provides top-up or boost:\u003c\/strong\u003e If the heat pump cannot meet DHW demand (e.g. during defrost, maintenance, or extreme cold), the 2.8 kW INCOTEC immersion heater activates to maintain DHW temperature. This can also be triggered by solar PV export for maximum self-consumption.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCOP remains high throughout:\u003c\/strong\u003e Because the buffer always provides a heat pump load, the heat pump avoids short-cycling and operates at larger, more efficient run cycles — maintaining peak COP rather than degrading through frequent starts and stops.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003c!-- TECHNICAL SPECIFICATIONS --\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\n  \u003ctr\u003e\n    \u003cth\u003eSpecification\u003c\/th\u003e\n    \u003cth\u003eUnit\u003c\/th\u003e\n    \u003cth class=\"col-dhw\"\u003eDHW Cylinder (Upper)\u003c\/th\u003e\n    \u003cth class=\"col-buf\"\u003eBuffer \/ Volumiser (Lower)\u003c\/th\u003e\n  \u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n  \u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e11003523\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eOGC300 — Optima\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e225\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eEffective Capacity at 40°C\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e355 (combined)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e595\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eOverall Height\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e1,776\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWeight (full \/ net)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e355\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eEnergy Rating (ErP)\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eA\u003c\/td\u003e\n\u003ctd\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.08\u003c\/td\u003e\n\u003ctd\u003e0.74\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint (immersion)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e40–70 (adjustable)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSafety Thermostat Cut-out\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMax Operating Temperature\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMax Design Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eT\u0026amp;P Valve Rating\u003c\/td\u003e\n\u003ctd\u003ebar \/ °C\u003c\/td\u003e\n\u003ctd\u003e7 \/ 90–95\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePrimary Coil Power Output\u003c\/td\u003e\n\u003ctd\u003ekW\u003c\/td\u003e\n\u003ctd\u003e36.5\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePrimary Coil Surface Area\u003c\/td\u003e\n\u003ctd\u003em²\u003c\/td\u003e\n\u003ctd\u003e2.6\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePrimary Flow Rate (design)\u003c\/td\u003e\n\u003ctd\u003eL\/h\u003c\/td\u003e\n\u003ctd\u003e900\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eHeat-up Time from 10°C (coil)\u003c\/td\u003e\n\u003ctd\u003emin\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eRecovery Time to 70% (coil)\u003c\/td\u003e\n\u003ctd\u003emin\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBackup Immersion Power\u003c\/td\u003e\n\u003ctd\u003ekW\u003c\/td\u003e\n\u003ctd\u003e2.8 @ 230V \/ 3.0 @ 240V\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eImmersion Heater Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eIncoloy 825 (INCOTEC)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV \/ Hz\u003c\/td\u003e\n\u003ctd\u003e220–240 VAC \/ 50 Hz\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eIP Classification\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eIP21\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eInsulation Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003ePUR + Vacuum Insulation Panels (VIP)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eInsulation Thickness (average)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eExpansion Vessel (supplied)\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBuffer Connections\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eG 1\" female (upper \u0026amp; lower)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDHW Cold Water Inlet\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ¾\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDHW Hot Water Outlet\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ¾\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCoil Connections (upper \u0026amp; lower)\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ¾\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eImmersion Heater Connection\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG 1¼\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eT\u0026amp;P Valve Connection\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ½\" female (factory-fitted)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTemperature Sensor Pockets\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e2 × (6mm and 8mm compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAdjustable Feet Range\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e0–40 (factory-fitted)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMin Servicing Clearance (front)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e400\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMin Servicing Clearance (above)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e150\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eKIWA Watertec — Building \u0026amp; Water Regulations approved\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eUKCA Marking\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eQuality \/ Environmental\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eISO 9001 \/ ISO 14001 \/ ISO 45001\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eComponents Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003c!-- INSTALLATION CALLOUT --\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eQualified installer required:\u003c\/strong\u003e The OGC300 is an unvented hot water cylinder. Installation of the DHW section must be carried out by a G3-qualified unvented hot water installer. Heat pump connections must be carried out by a competent heat pump engineer. All electrical work must comply with BS 7671 and IET Wiring Regulations (minimum 16A dedicated supply, 20A double-pole isolation switch with 3mm contact separation). Mains cable must be rated to 90°C continuously.\u003c\/div\u003e\n\n\u003col class=\"steps\"\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eSiting and floor preparation:\u003c\/strong\u003e Position the OGC300 on a solid, level floor capable of supporting 355 kg (full weight). Allow 400mm clearance in front of the junction box covers and 150mm above the top of the unit. Unscrew the adjustable feet a minimum of 15mm from the base before levelling.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill the upper DHW cylinder first:\u003c\/strong\u003e Open the furthest hot water outlet and the mains cold supply stop cock. Allow water to flow until air is purged from the upper cylinder, then close taps and check all connections for leaks. The upper cylinder must be filled with water before the power is switched on.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect the heat pump primary circuit:\u003c\/strong\u003e Connect the heat pump flow and return to the coil connections (E and F — G¾\" female). Connect the buffer tank connections (C and D — G1\" female) to the heat pump heating circuit as applicable. Fit a drain cock at the lowest point of the buffer circuit (not supplied). Fill and bleed the buffer\/heating circuit in accordance with the heat pump manufacturer's instructions.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eInstall temperature sensors:\u003c\/strong\u003e Fit 6mm or 8mm heat pump temperature sensors into the sensor pockets as required by your heat pump controller. Pull out the sensor bracket, insert the sensor, and refit ensuring full contact with the inner stainless steel wall surface.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect DHW cold water inlet and hot water outlet:\u003c\/strong\u003e Connect mains cold water supply to connection H (G¾\" female). Connect hot water outlet to connection K (G¾\" female). A mixing valve (not supplied) is strongly recommended to prevent scalding at draw-off points — maximum stored temperature is 70°C.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect T\u0026amp;P valve discharge and tundish:\u003c\/strong\u003e Connect the T\u0026amp;P valve discharge to a tundish and discharge pipe in accordance with Building Regulations Part G. Ensure a continuous fall to drain and a clear, visible discharge point. Discharge pipe must be metal rated to the relevant temperature.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connections:\u003c\/strong\u003e Wire the 2.8 kW immersion heater to a dedicated 16A+ supply with a 20A double-pole isolation switch (3mm separation). Mains cable must withstand 90°C. Fit strain relievers (supplied) to both junction box cable entries. Do not switch on power until both vessels are filled with water.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCommission and test:\u003c\/strong\u003e Verify all pipe connections for tightness and leaks. Test T\u0026amp;P valve by turning the knob counter-clockwise and confirming free flow to drain. Adjust immersion thermostat (40–70°C, minimum 60°C for Legionella prevention). Complete the G3 commissioning logbook (supplied) and hand all documentation to the customer.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cdiv class=\"callout callout-amber\"\u003e💡 \u003cstrong\u003eMixer valve recommendation:\u003c\/strong\u003e The OGC300 stores DHW at up to 70°C. A thermostatic mixing valve (TMV) preset to a maximum of 60°C at draw-off is strongly recommended to prevent scalding risk, particularly where children or elderly users are present. This is a requirement under Part G of the Building Regulations for most domestic installations.\u003c\/div\u003e\n\n\u003cdiv class=\"callout callout-blue\"\u003eℹ️ \u003cstrong\u003eAnnual servicing:\u003c\/strong\u003e The OGC300 requires annual inspection and maintenance by a competent person to validate the 10-year cylinder warranty. This includes testing both safety valves, checking and recharging the expansion vessel (target 3 bar pre-charge), cleaning the line strainer, and recording service in the commissioning logbook. The immersion heater element must be removed for inspection after 5 years, then every 3 years thereafter — particularly important in hard water areas.\u003c\/div\u003e\n\n\u003c!-- FAQ --\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat is the difference between the DHW cylinder, the buffer, and the coil in the OGC300?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe OGC300 contains three distinct but connected elements. The \u003cstrong\u003eupper 225L DHW cylinder\u003c\/strong\u003e stores potable domestic hot water for showers, baths, and taps. The \u003cstrong\u003elower 65L buffer\/volumiser\u003c\/strong\u003e is a closed heating circuit vessel — it stores heat pump flow water (non-potable) and acts as a thermal flywheel, smoothing heat pump cycling. The \u003cstrong\u003e36.5 kW internal coil\u003c\/strong\u003e transfers heat from the heat pump's primary circuit into the DHW cylinder — it is a heat exchanger, not a separate vessel. The three work together so that buffer heat continuously pre-warms the DHW cylinder through the coil.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhy does combining the cylinder and buffer in one unit improve efficiency?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eTwo reasons. First, \u003cstrong\u003eheat loss is reduced\u003c\/strong\u003e — in a conventional two-tank system, the pipework between the cylinder and buffer loses heat to the surrounding air (even if well lagged), whereas the OGC300 encapsulates both tanks within the same foam-insulated casing. Second, \u003cstrong\u003eCOP is maintained\u003c\/strong\u003e — because the buffer always provides a steady load to the heat pump, the heat pump runs in longer, more efficient cycles rather than short-cycling, which degrades efficiency. The OGC300 achieves both A-class ErP ratings for DHW and buffer.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eDoes the OGC300 work with both air source and ground source heat pumps?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eYes. The OGC300 is compatible with any heat pump — ASHP (air source) or GSHP (ground source) — up to 15 kW output that uses a three-way valve to switch between space heating and DHW modes. This covers the vast majority of domestic heat pump installations in the UK. Check your heat pump's flow rate and connection sizes against the OGC300's coil connections (G¾\" female, 900 L\/h design flow rate).\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eHow much usable hot water does the OGC300 actually provide?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe nominal DHW cylinder volume is 225L, but the effective usable hot water capacity at 40°C draw-off temperature is \u003cstrong\u003e355 litres\u003c\/strong\u003e. This is because the cylinder stores water at up to 70°C — when blended down to 40°C comfort temperature, the volume of usable water is significantly greater than the nominal 225L. OSO rates this as sufficient for approximately 5.5 persons, making the OGC300 appropriate for larger family homes.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat is the maximum heat pump capacity the OGC300 can work with?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe OGC300 is designed for heat pumps up to \u003cstrong\u003e15 kW output\u003c\/strong\u003e. The primary heating coil has a rated power output of 36.5 kW at the design flow rate of 900 L\/h, which comfortably accommodates the thermal output of domestic heat pumps in this range. For heat pumps larger than 15 kW, consult OSO for an appropriate commercial cylinder specification.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eCan I connect solar PV to the OGC300?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eYes. The 2.8 kW backup immersion heater can be connected to a solar PV diverter device, allowing excess solar generation to heat the DHW cylinder instead of being exported to the grid. The immersion heater position within the OGC300 is designed so that it can heat \u003cstrong\u003e100% of the DHW cylinder volume\u003c\/strong\u003e when operating from solar or mains — maximising self-consumption and reducing running costs.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat are the two separate pressure ratings, and why do they differ?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe \u003cstrong\u003eupper DHW cylinder is rated to 10 bar\u003c\/strong\u003e — a standard mains-pressure unvented rating for potable hot water systems. The \u003cstrong\u003elower buffer circuit is rated to 2.5 bar\u003c\/strong\u003e — appropriate for a closed heating system connected to a heat pump, where operating pressures are typically 1–2 bar. These are physically separate circuits with no direct water connection, so the pressure difference is not a problem. Never attempt to connect mains water pressure to the buffer circuit.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eHow does the OGC300 compare to installing a separate cylinder and buffer tank?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eA conventional setup requires a DHW cylinder, a separate buffer tank, interconnecting pipework (and lagging), fittings for two G3 kits, and installation time for both units plus the pipework between them. The OGC300 eliminates all of this — single delivery, single installation footprint, single set of pipework connections, and one G3 kit included in the price. OSO reports significant reductions in both material cost and installation time. The combined insulation of both tanks within one casing also means less heat loss than two separately insulated tanks.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat warranty comes with the OGC300?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe stainless steel cylinder carries a \u003cstrong\u003e10-year warranty\u003c\/strong\u003e against defects in materials and manufacture — provided the cylinder is serviced annually by a competent person and the service logbook (supplied) is updated at each service visit. Electrical components and valve gear carry a 2-year warranty. Warranty conditions include correct installation by a professional, use with compliant mains water (chloride \u0026lt;250 mg\/L, conductivity \u0026lt;750 µS\/cm at 25°C, pH 6.0–9.5), and hard water protection (max 10°dH hardness — a water softener is recommended above this).\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eDoes the OGC300 come with Building Regulations compliance documentation?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eYes. The OGC300 is approved to Building Regulations and Water Regulations by \u003cstrong\u003eKIWA Watertec Ltd\u003c\/strong\u003e, the relevant UK notified body for unvented hot water systems. It carries UKCA marking and is supplied with a G3 inlet group kit (strainer, PRV, expansion relief, tundish) and an 18L expansion vessel, all factory-fitted. The supplied commissioning logbook, when completed by the G3-qualified installer, serves as the compliance record for Part G3 of the Building Regulations.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63640041947485,"sku":"OGC300","price":1795.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOOptimaOGC300HeatPumpCylinderwithBufferTank.webp?v=1772168082","url":"https:\/\/qualityheating.co.uk\/products\/oso-optima-ogc300-combined-heat-pump-cylinder-buffer-tank-225l-dhw-65l-buffer","provider":"AIZO Quality Heating","version":"1.0","type":"link"}