SBTP18C
Strom
18 kW
Electric Combi
Three Phase
Instant Hot Water
Strom 18kW Electric Combi Boiler – Three Phase (SBTP18C) — High-output electric combi boiler delivering central heating & instant hot water up to 9 l/min | 18 kW output on 400 V three-phase | Touchscreen controls & LED display | Integrated pump & expansion vessel | No flue, no carbon monoxide risk | Near-silent operation | Solar-compatible & underfloor heating ready | 5-year warranty (registration required) | Ideal for larger homes, multiple bathrooms or high-demand properties
✅ Flue-free, emission-free heating & hot water – perfect for larger homes or off-grid properties with three-phase supply
Runs 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 & Economy 10 tariffs for maximum savings.
The 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.
Featuring 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.
What Makes the Strom 18kW Electric Combi Special?
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Instant Hot Water & Heating in One Unit — Combi design eliminates need for hot water cylinder — saves space & installation costs.
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Flue-Free & Zero Emissions — No gas, no flue, no CO risk — safe for any property, including new-builds or urban retrofits.
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Near-Silent Operation — Only 15 dB — quieter than a whisper — ideal for installation near living areas or bedrooms.
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Touchscreen Controls — Intuitive digital interface for precise temperature adjustment, scheduling & status monitoring.
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Integrated Pump & Vessel — All-in-one system — simplifies plumbing & reduces external components.
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Solar & Economy Tariff Ready — Pair with PV diverter or Economy 10 for significantly reduced running costs.
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5-Year Warranty — Register online for full coverage — long-term peace of mind.
Key Features
18 kW OutputPowerful three-phase performance — suits larger homes & high DHW demand.
Instant DHW FlowUp to 9 l/min at 30 °C rise — fast filling baths & powerful showers.
Touchscreen & LED DisplayModern digital controls for precise temperature & timer adjustments.
Integrated Pump & Expansion VesselCompact all-in-one design — fewer external parts & easier install.
No Flue or CO RiskEmission-free electric operation — safe for any property.
Near-Silent RunningOnly 15 dB — suitable for quiet environments.
Solar PV CompatibleUse with diverter to heat water for free using surplus solar.
Technical Specifications
| Specification |
Value |
| MPN / SKU |
SBTP18C |
| EAN |
5060797570044 |
| Power Output |
18 kW |
| Power Supply |
400 V AC, Three Phase |
| Current Draw |
26 A per phase |
| Recommended Breaker |
32 A per phase |
| Recommended Cable Size |
6 mm² per phase |
| Heating Pressure Range |
0.5 – 1.5 bar |
| Max DHW Pressure |
6.0 bar |
| Max Flow Temperature |
80 °C |
| DHW Flow Rate @ 30 °C Rise |
9 l/min |
| Connections |
Heating: 3/4" Male, PRV: 1/2" Female |
| Dimensions (H × W × D) |
700 × 425 × 260 mm |
| Weight |
20 kg |
| Sound Pressure Level |
15 dB |
| ErP Rating (Heating / DHW) |
D / A |
| Warranty |
5 years (registration required) |
What's in the Box
✔ 1 × Strom 18kW Electric Combi Boiler (SBTP18C)
✔ Wall fixings & mounting guide
✔ Installation & user manual
✅ Installation by qualified electrician/plumber per BS 7671 & building regulations. Recommended 32 A breaker per phase & 6 mm² cable. Compatible with solar PV diverters, Economy 10 tariffs, underfloor heating & most UK domestic systems. Register online for full 5-year warranty. No flue or gas supply required — zero CO risk.
Frequently Asked Questions
Does it need a flue or gas connection?
No — 100% electric operation. No flue, no gas supply, no carbon monoxide risk — safe for any property.
What size property is this suitable for?
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.
Can it work with solar panels?
Yes — pair with a solar diverter to heat water using surplus PV generation — significantly reduces running costs.
How quiet is the boiler?
Extremely quiet — only 15 dB sound pressure level — suitable for installation near living areas or bedrooms.
What electrical supply is needed?
Three-phase 400 V, 26 A per phase draw. Requires 32 A breaker per phase & minimum 6 mm² cable — consult electrician for load check.
Is there a warranty?
Yes — 5 years manufacturer warranty (registration required on Strom website). Covers manufacturing defects.
Can it supply underfloor heating?
Yes — fully compatible with underfloor systems (max flow temp 80 °C). Low running costs when paired with Economy tariffs.
Who installs it?
Qualified electrician & plumber per BS 7671 & building regulations. Full electrical & plumbing checks required before use.
