{"product_id":"oso-aquasustain-260-integrated-heat-pump-cylinder-r290-260l-exhaust-air-mev-dhw-heat-pump","title":"OSO AquaSustain 260 Integrated Heat Pump Cylinder R290 | 260L | Exhaust Air MEV DHW Heat Pump","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-orange #e65100 | Info-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\n ── Feature list ── ,\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 4px 0 4px 22px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\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: 520px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; word-break: break-word; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; white-space: nowrap; }\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.qh-pd .sku { font-family: 'Courier New', monospace; font-size: 12px; background: #e6f4f3;\n  color: #005f55; padding: 2px 6px; border-radius: 3px; font-weight: 700; }\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 ── Dark strip ── ,\n.qh-pd .dark-strip { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.8rem 1.1rem; font-size: 14px; margin-bottom: 1.4rem; line-height: 1.7; }\n.qh-pd .dark-strip strong { color: #7fe8df; }\n\n ── Advantage 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\u003cdiv class=\"badge-row\"\u003e\n\u003cspan class=\"badge b-teal\"\u003eIntegrated Heat Pump Cylinder\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eR290 Refrigerant – GWP 3\u003c\/span\u003e\u003cspan class=\"badge b-amber\"\u003e260 Litres\u003c\/span\u003e\u003cspan class=\"badge b-teal\"\u003eCoP up to 3.55\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eEnergy Rating A+\u003c\/span\u003e\u003cspan class=\"badge b-grey\"\u003eExhaust Air \/ MEV\u003c\/span\u003e\u003cspan class=\"badge b-outline\"\u003eStainless Steel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO AquaSustain 260 (DHP) is a fully integrated domestic hot water heat pump cylinder designed for properties where underfloor mechanical extract ventilation (MEV) is installed, or where external air can be ducted in and out. The heat pump unit sits in the upper section of the cylinder and extracts thermal energy from the incoming air stream, concentrating it to heat the 260-litre stainless steel storage vessel in the lower section. Using R290 (propane) refrigerant — with a Global Warming Potential of just 3 and zero Ozone Depletion Potential — the AquaSustain achieves a Coefficient of Performance of up to 3.55 in warm climates and 3.24 in average conditions, meaning it delivers up to 3.55 kWh of heat for every 1 kWh of electricity consumed. The cylinder reaches up to 60°C on heat pump power alone, with a 1.5 kW auxiliary immersion for boost or backup. A complete G3 Building Regulations kit (24L expansion vessel, inlet control valve, tundish) is supplied factory-fitted, simplifying compliance and reducing installation time.\u003c\/p\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n\u003cli\u003eIntegrated single-footprint design — heat pump and cylinder in one unit, no separate plant room required\u003c\/li\u003e\n\u003cli\u003eR290 (propane) refrigerant: GWP of 3, Ozone Depletion Potential of 0 — future-proof low-carbon solution\u003c\/li\u003e\n\u003cli\u003eCoP up to 3.55 (warm climate) \/ 3.24 (average climate) — delivers over 3× the energy input as useful heat\u003c\/li\u003e\n\u003cli\u003eHeats to 60°C on heat pump alone — no need to use backup immersion for pasteurisation\u003c\/li\u003e\n\u003cli\u003eA+ energy rating — ideal for Building Regulations Part L compliance and SAP calculations\u003c\/li\u003e\n\u003cli\u003eNCM (SAP) identifier 108964 — listed on government energy database\u003c\/li\u003e\n\u003cli\u003e1.5 kW auxiliary immersion heater for backup and boost operation (max 70°C with element)\u003c\/li\u003e\n\u003cli\u003eComplete G3 kit factory-fitted: 24L expansion vessel, inlet control valve, tundish\u003c\/li\u003e\n\u003cli\u003eStainless steel cylinder with ULTRAWELD construction — 5-year manufacturer's warranty\u003c\/li\u003e\n\u003cli\u003eINCOTEC immersion heater — high durability in hard water areas\u003c\/li\u003e\n\u003cli\u003eDesigned to work with MEV (Mechanical Extract Ventilation) systems — draws stale warm air from kitchen\/bathroom\u003c\/li\u003e\n\u003cli\u003eCan also connect to external air supply via 150–200mm duct connections\u003c\/li\u003e\n\u003cli\u003eFully insulated cylinder body to minimise standing heat loss\u003c\/li\u003e\n\u003cli\u003eSuitable for domestic properties in both new build and retrofit installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n\u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eINCOTEC — Hard Water Durability\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eR290 — Ultra-Low GWP Refrigerant\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eECO Insulation\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n\u003cdiv class=\"box-item\"\u003eAquaSustain 260 cylinder with integrated heat pump\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e1.5 kW INCOTEC auxiliary immersion heater\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eP\u0026amp;T safety valve (10 bar \/ 90–95°C)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e24L expansion vessel (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInlet control valve (strainer, PRV, expansion relief)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eAir duct connection fittings (150–160–200mm)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInstallation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003cth\u003eAquaSustain 260\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd\u003e11012315\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\u003eAquaSustain 260 DHP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Volume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H × Ø)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e1907 × 584\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Depth\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e624\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\u003e92\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e352\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Weight\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss (EN 12897)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.90\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption (avg climate)\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e1,255\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption (cold climate)\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e1,576\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption (warm climate)\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e1,143\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eA+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTapping Profile\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOP — Average Climate\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3.24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOP — Warm Climate\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3.55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Heating Efficiency (avg climate)\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e142\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Heating Efficiency (warm climate)\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e147\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax DHW Temperature (HP)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax DHW Temperature (with immersion)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint (default)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e55 (ECO) \/ 60 (AUTO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Range\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e−10 to +40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRefrigerant \/ Charge\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eR290 \/ 150 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRefrigerant GWP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Pump Power Input Range\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e405–500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeating Power Range\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e1,005–1,750\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuxiliary Immersion Power\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e1,500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Power Consumption (HP + element)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e2,000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Power Level\u003c\/td\u003e\n\u003ctd\u003edB(A)\u003c\/td\u003e\n\u003ctd\u003e53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Pressure at 2m (high speed)\u003c\/td\u003e\n\u003ctd\u003edB(A)\u003c\/td\u003e\n\u003ctd\u003e45.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Pressure at 2m (low speed)\u003c\/td\u003e\n\u003ctd\u003edB(A)\u003c\/td\u003e\n\u003ctd\u003e41\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin Air Flow (external supply)\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e215\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin Air Flow (internal\/MEV supply)\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Air Flow — Low Speed\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e370\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Air Flow — High Speed\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e438\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatic Pressure (low speed, external)\u003c\/td\u003e\n\u003ctd\u003ePa\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatic Pressure (high speed, external)\u003c\/td\u003e\n\u003ctd\u003ePa\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDuct Connection Diameter\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e150 \/ 160 \/ 200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV\/Ph\/Hz\u003c\/td\u003e\n\u003ctd\u003e230 \/ 1 \/ 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Connections (in\/out\/recirc)\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003e¾\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Valve Connection\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003e½\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNCM (SAP) Identifier\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e108964\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\u003e24\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\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eF-Gas \u0026amp; Refrigerant:\u003c\/strong\u003e The AquaSustain contains 150 g of R290 refrigerant (propane). Servicing or refrigerant handling must only be carried out by qualified F-Gas certified technicians. The unit is sealed and cannot be recharged in the field by the user.\u003c\/div\u003e\n\u003cdiv class=\"callout callout-blue\"\u003eℹ️ \u003cstrong\u003eMEV Integration:\u003c\/strong\u003e The AquaSustain is classified as an Exhaust Air heat pump. In a property with MEV (Mechanical Extract Ventilation), the heat pump draws warm, stale air from kitchens and bathrooms, extracts its heat energy, and discharges cooler air outside — combining hot water production with whole-house ventilation energy recovery.\u003c\/div\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 Installation must be carried out by a qualified unvented hot water installer holding a current G3 qualification (or equivalent). Electrical connections must comply with BS 7671. Refrigerant circuit must not be altered by non-F-Gas-certified personnel.\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eSurvey and siting:\u003c\/strong\u003e Confirm the installation location can accommodate the unit dimensions (1907 × 584 × 624mm). Allow a minimum of 400mm clearance above the unit. The floor must be capable of supporting the full weight (352 kg when full of water).\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eDuctwork design:\u003c\/strong\u003e Calculate total pressure drop for supply and extract ductwork. OSO recommends insulated ductwork (min. 0.625 m²K\/W). Include all components — flexible connections, anti-insect grids — in pressure drop calculations. Connect using 150mm, 160mm, or 200mm duct adapters.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCold water supply connection:\u003c\/strong\u003e Connect the mains cold water supply to the inlet control valve (supplied). Ensure supply pressure is within system limits. The G3 kit components (strainer, PRV, expansion relief, tundish) are factory-fitted.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHot water outlet connection:\u003c\/strong\u003e Connect the hot water outlet to the distribution pipework. Add a mixing valve if required to limit draw-off temperature.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connection:\u003c\/strong\u003e Wire the unit to a dedicated 230V \/ 13A fused spur. Do not share with other high-load appliances. Connect the immersion heater thermostat wiring as per the wiring diagram in the installation manual.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill and commission:\u003c\/strong\u003e Fill the cylinder with cold water and check all connections for leaks. Bleed any air from the cylinder. Power up the unit and set the operating mode (ECO for heat pump only, AUTO for heat pump + immersion). Allow up to 8 hours for initial heat-up from cold.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHandover:\u003c\/strong\u003e Advise the homeowner not to switch the unit off completely during normal use. The unit manages its own temperature automatically. Provide all documentation including the installation guide and G3 compliance record.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"callout callout-amber\"\u003e💡 \u003cstrong\u003eOperating note:\u003c\/strong\u003e The AquaSustain is designed to trickle-heat water slowly over several hours, not to deliver rapid heat-up. Initial heat-up from cold can take up to 8 hours. The unit should remain energised at all times unless the property is empty for more than 24 hours. It manages its own thermostat automatically.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is a heat pump cylinder and how does it differ from a standard electric cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA standard direct electric cylinder uses an immersion heater to heat water — consuming 1 kWh of electricity to produce 1 kWh of heat. The AquaSustain uses an air-source heat pump to extract heat from air and concentrate it into the water. For every 1 kWh of electricity used, the AquaSustain produces up to 3.55 kWh of useful heat — dramatically reducing running costs and carbon emissions.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the AquaSustain 260 need an MEV (Mechanical Extract Ventilation) system?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eNot necessarily, but it is specifically classified as an Exhaust Air heat pump for MEV installations, where it doubles as a ventilation energy recovery unit. It can also operate by ducting external air directly in and out of the building. Your installer will assess which configuration suits your property.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan the AquaSustain heat water to 60°C using the heat pump alone?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The AquaSustain can reach 60°C on heat pump power alone — sufficient for Legionella prevention without needing the auxiliary immersion heater. The 1.5 kW immersion extends the maximum to 70°C for supplementary use.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is R290 and why is it used?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eR290 is propane, a natural refrigerant with a Global Warming Potential of just 3 (compared to 675+ for R134a or over 2,000 for R410A). It has zero Ozone Depletion Potential. OSO uses R290 to ensure the AquaSustain is as environmentally responsible as possible and future-proof against F-Gas phase-down regulations.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow long does it take to heat a full cylinder from cold?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eIn ECO mode (heat pump only), the 260L cylinder takes approximately 517 minutes (around 8–9 hours) to heat from cold. This is by design — the unit trickle-heats over an extended period rather than delivering rapid heat-up. It should remain switched on at all times during normal occupancy.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the NCM \/ SAP identifier for the AquaSustain 260?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe SAP identifier for the AquaSustain 260 is 108964. This can be used in SAP energy calculations for new build and retrofit projects requiring Part L compliance documentation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat duct sizes does the AquaSustain connect to?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe AquaSustain accepts 150mm, 160mm, or 200mm duct connections for both air intake and air discharge. OSO recommends thermally insulated ductwork (minimum 0.625 m²K\/W) to prevent condensation. All duct runs must be included in pressure drop calculations before installation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat warranty comes with the AquaSustain 260?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe stainless steel cylinder carries a 5-year manufacturer's warranty covering defects in materials and manufacture. Electrical components and valve gear carry a 2-year warranty. Warranty conditions apply — refer to OSO's warranty documentation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan I connect the AquaSustain to a solar PV system?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe auxiliary immersion heater can be controlled externally and is compatible with solar diverter devices. This allows excess solar generation to be used to heat water via the immersion, maximising self-consumption. The heat pump compressor itself operates from grid or PV power independently.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the AquaSustain suitable for retrofit installations?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. Provided sufficient space is available (the 260L unit is 1,907mm tall), it can be installed in existing properties. The unit requires a 230V single-phase supply and ductwork for air supply and exhaust. Your installer will assess duct routing and structural suitability before installation.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63639848616285,"sku":"11012315","price":3200.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotwaterAquaSustainDHP200LitreIntegratedHeatPumpCylinder.webp?v=1769615781","url":"https:\/\/qualityheating.co.uk\/products\/oso-aquasustain-260-integrated-heat-pump-cylinder-r290-260l-exhaust-air-mev-dhw-heat-pump","provider":"AIZO Quality Heating","version":"1.0","type":"link"}