{"product_id":"strom-18kw-electric-combi-boiler-three-phase","title":"Strom 18kW Electric Combi Boiler Three Phase Instant Hot Water \u0026 Heating SBTP18C","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003eSBTP18C\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eStrom\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003e18 kW\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003eElectric Combi\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eThree Phase\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eInstant Hot Water\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eStrom 18kW Electric Combi Boiler – Three Phase (SBTP18C)\u003c\/strong\u003e — High-output electric combi boiler delivering central heating \u0026amp; instant hot water up to 9 l\/min | 18 kW output on 400 V three-phase | Touchscreen controls \u0026amp; LED display | Integrated pump \u0026amp; expansion vessel | No flue, no carbon monoxide risk | Near-silent operation | Solar-compatible \u0026amp; underfloor heating ready | 5-year warranty (registration required) | Ideal for larger homes, multiple bathrooms or high-demand properties\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ Flue-free, emission-free heating \u0026amp; hot water – perfect for larger homes or off-grid properties with three-phase supply\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eRuns on standard three-phase 400 V supply (32 A breaker per phase, 6 mm² cable recommended). No gas supply or flue needed — zero CO risk. High DHW flow rate suits properties with 2–4 bathrooms or high simultaneous demand. Compatible with solar PV diverters \u0026amp; Economy 10 tariffs for maximum savings.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe Strom 18kW Electric Combi Boiler (SBTP18C) is a powerful, all-electric combi unit that provides reliable central heating and instant domestic hot water without the need for a separate cylinder, hot water tank or gas connection. With 18 kW output on three-phase 400 V, it delivers up to 9 litres per minute of hot water at a 30 °C rise — ideal for larger family homes, properties with multiple bathrooms, high-flow showers or demanding simultaneous usage.\u003c\/p\u003e\n\n  \u003cp\u003eFeaturing advanced touchscreen digital controls with LED display, high-efficiency serpentine heating elements, integrated circulation pump and expansion vessel, the boiler operates near-silently (15 dB sound pressure level) thanks to minimal moving parts. No flue or chimney required — completely emission-free and carbon monoxide safe. Fully compatible with solar PV systems (via diverter), underfloor heating, and smart tariffs (Economy 10), it offers a modern, low-maintenance, future-proof heating solution for homes transitioning away from gas or oil, especially those already equipped with three-phase supply.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the Strom 18kW Electric Combi Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInstant Hot Water \u0026amp; Heating in One Unit\u003c\/strong\u003e — Combi design eliminates need for hot water cylinder — saves space \u0026amp; installation costs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFlue-Free \u0026amp; Zero Emissions\u003c\/strong\u003e — No gas, no flue, no CO risk — safe for any property, including new-builds or urban retrofits.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNear-Silent Operation\u003c\/strong\u003e — Only 15 dB — quieter than a whisper — ideal for installation near living areas or bedrooms.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTouchscreen Controls\u003c\/strong\u003e — Intuitive digital interface for precise temperature adjustment, scheduling \u0026amp; status monitoring.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntegrated Pump \u0026amp; Vessel\u003c\/strong\u003e — All-in-one system — simplifies plumbing \u0026amp; reduces external components.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSolar \u0026amp; Economy Tariff Ready\u003c\/strong\u003e — Pair with PV diverter or Economy 10 for significantly reduced running costs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e5-Year Warranty\u003c\/strong\u003e — Register online for full coverage — long-term peace of mind.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003e18 kW Output\u003c\/strong\u003ePowerful three-phase performance — suits larger homes \u0026amp; high DHW demand.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eInstant DHW Flow\u003c\/strong\u003eUp to 9 l\/min at 30 °C rise — fast filling baths \u0026amp; powerful showers.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eTouchscreen \u0026amp; LED Display\u003c\/strong\u003eModern digital controls for precise temperature \u0026amp; timer adjustments.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eIntegrated Pump \u0026amp; Expansion Vessel\u003c\/strong\u003eCompact all-in-one design — fewer external parts \u0026amp; easier install.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eNo Flue or CO Risk\u003c\/strong\u003eEmission-free electric operation — safe for any property.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eNear-Silent Running\u003c\/strong\u003eOnly 15 dB — suitable for quiet environments.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eSolar PV Compatible\u003c\/strong\u003eUse with diverter to heat water for free using surplus solar.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMPN \/ SKU\u003c\/td\u003e\n\u003ctd\u003eSBTP18C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEAN\u003c\/td\u003e\n\u003ctd\u003e5060797570044\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePower Output\u003c\/td\u003e\n\u003ctd\u003e18 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e400 V AC, Three Phase\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCurrent Draw\u003c\/td\u003e\n\u003ctd\u003e26 A per phase\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRecommended Breaker\u003c\/td\u003e\n\u003ctd\u003e32 A per phase\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRecommended Cable Size\u003c\/td\u003e\n\u003ctd\u003e6 mm² per phase\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeating Pressure Range\u003c\/td\u003e\n\u003ctd\u003e0.5 – 1.5 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax DHW Pressure\u003c\/td\u003e\n\u003ctd\u003e6.0 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Flow Temperature\u003c\/td\u003e\n\u003ctd\u003e80 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDHW Flow Rate @ 30 °C Rise\u003c\/td\u003e\n\u003ctd\u003e9 l\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003eHeating: 3\/4\" Male, PRV: 1\/2\" Female\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions (H × W × D)\u003c\/td\u003e\n\u003ctd\u003e700 × 425 × 260 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSound Pressure Level\u003c\/td\u003e\n\u003ctd\u003e15 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eErP Rating (Heating \/ DHW)\u003c\/td\u003e\n\u003ctd\u003eD \/ A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years (registration required)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × Strom 18kW Electric Combi Boiler (SBTP18C)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Wall fixings \u0026amp; mounting guide\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Installation \u0026amp; user manual\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Installation by qualified electrician\/plumber per BS 7671 \u0026amp; building regulations. Recommended 32 A breaker per phase \u0026amp; 6 mm² cable. Compatible with solar PV diverters, Economy 10 tariffs, underfloor heating \u0026amp; most UK domestic systems. Register online for full 5-year warranty. No flue or gas supply required — zero CO risk.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes it need a flue or gas connection?\u003c\/strong\u003e\n    No — 100% electric operation. No flue, no gas supply, no carbon monoxide risk — safe for any property.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat size property is this suitable for?\u003c\/strong\u003e\n    Ideal for larger homes or properties with 2–4 bathrooms and high hot water demand (9 l\/min @ 30 °C rise). For very large properties consider multiple units or higher-output models.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan it work with solar panels?\u003c\/strong\u003e\n    Yes — pair with a solar diverter to heat water using surplus PV generation — significantly reduces running costs.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow quiet is the boiler?\u003c\/strong\u003e\n    Extremely quiet — only 15 dB sound pressure level — suitable for installation near living areas or bedrooms.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat electrical supply is needed?\u003c\/strong\u003e\n    Three-phase 400 V, 26 A per phase draw. Requires 32 A breaker per phase \u0026amp; minimum 6 mm² cable — consult electrician for load check.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs there a warranty?\u003c\/strong\u003e\n    Yes — 5 years manufacturer warranty (registration required on Strom website). Covers manufacturing defects.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan it supply underfloor heating?\u003c\/strong\u003e\n    Yes — fully compatible with underfloor systems (max flow temp 80 °C). Low running costs when paired with Economy tariffs.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWho installs it?\u003c\/strong\u003e\n    Qualified electrician \u0026amp; plumber per BS 7671 \u0026amp; building regulations. Full electrical \u0026amp; plumbing checks required before use.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Strom","offers":[{"title":"Default Title","offer_id":63454854971741,"sku":"SBTP18C","price":1370.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/StromSinglePhaseElectricBoiler_8d9c8ca4-3eac-432d-a59c-7974dd468386.png?v=1751972861","url":"https:\/\/qualityheating.co.uk\/products\/strom-18kw-electric-combi-boiler-three-phase","provider":"AIZO Quality Heating","version":"1.0","type":"link"}