The Strom 14.4kW Electric Combi Boiler (single-phase, model SBSP15C) is the range-topping single-phase combi in Strom's electric boiler line-up, combining central heating and instant hot water in one compact, flue-free unit. Running on a standard single-phase 230V supply, it delivers up to 7 litres per minute of hot water at a 30°C temperature rise, suiting larger family homes or properties with higher simultaneous demand where a three-phase supply isn't available.
Built around Strom's patented serpentine heat exchanger for fast, even heat transfer, the SBSP15C pairs touchscreen digital controls with LED display with an integrated pump and expansion vessel, running at near-silent 15dB with zero carbon monoxide emissions at the point of use. It's a future-proof, low-maintenance option for homes moving away from gas or oil, particularly where a single-phase supply is all that's available.
14.4 kW
Heat Output
7 L/min
DHW Flow @ 30°C Rise
230V 1PH
Power Supply
62 A
Rated Current
15 dB
Sound Pressure
5 Yr
Warranty*
Qualified Electrician & Plumber Required
Installation must be carried out by a qualified electrician and plumber in accordance with BS 7671 wiring regulations and current building regulations. An electrical installation certificate and Part P certificate are legally required for the new circuit, and are also a condition of the manufacturer's warranty.
Check Supply Capacity Before Buying
This model draws 62A on a single-phase supply, requiring a 63A breaker and 10mm² cable. On an older consumer unit with a 60A or 80A main fuse, adding this load may exceed total available capacity — an electrician should check the property's supply and available ways before ordering. Actual delivered hot water flow also depends on incoming mains water pressure.
Correct Sizing Matters
A proper heat loss calculation should be carried out before purchase. Electric boilers are 100% efficient at the point of use, so replacing an older gas or oil boiler like-for-like will typically oversize the new unit, which Part L 2022 of the Building Regulations advises against.
Combi Design, No Cylinder Needed
Heating and instant hot water from one compact unit, removing the need for a separate hot water cylinder and freeing up airing cupboard or plant room space.
Patented Serpentine Heat Exchanger
Heat spreads evenly across the whole element surface rather than at a single hotspot, improving heat-up speed and reducing limescale-related performance loss over time.
Near-Silent 15dB Operation
With minimal moving parts, the boiler runs quietly enough to be installed close to living areas or bedrooms without disturbance.
Touchscreen & LED Display
Intuitive touchscreen digital controls give precise temperature adjustment, scheduling and live system status.
Integrated Pump & Expansion Vessel
The circulation pump and expansion vessel are built in, simplifying installation and reducing the number of separate parts to source and fit.
Highest Output in the Single-Phase Range
At 14.4kW, this is the largest single-phase combi Strom offer, giving the most hot water flow available without needing a three-phase supply.
General
Model / MPN
SBSP15C
EAN
5060438331973 / 5060797570029
Boiler Type
Electric Combi Boiler (heating & instant hot water)
Heating Output
14.4 kW
Heating Element
Patented multi-strand serpentine heat exchanger
Sound Pressure Level
15 dB (near-silent operation)
Electrical Supply
Phase
Single-phase
Voltage
230V AC
Current Draw
62 A
Minimum Recommended Breaker
63 A
Minimum Recommended Cable Size
10mm²
Heating & Hot Water Circuit
Max. Heating Pressure
1.5 bar
Min. Heating Pressure
0.5 bar
Max. DHW Pressure
6.0 bar
DHW Flow Rate (30°C Rise)
7 litres/minute
Max. Flow Temperature
80°C
Heating Connection
3/4" Male
PRV Connection
1/2" Female
Physical & Compliance
Dimensions (H x W x D)
700 x 425 x 260mm
Weight
20 kg
Mounting
Wall-mounted, integrated bracket, upright position only
ErP Rating (Heating / DHW)
D / A
Compatible With
Solar PV diverters, underfloor heating, Economy 10 tariffs
Does this boiler need a flue or gas connection?
No. The SBSP15C is 100% electric with no flue, no gas supply and no carbon monoxide risk, making it safe to install in almost any property, including new-builds and urban retrofits.
Does my consumer unit need upgrading for this model?
It depends on existing capacity. This boiler needs a 63A breaker on a dedicated circuit, which can exceed an older 60A or 80A main fuse's total available supply. An electrician should always check the consumer unit rating, available ways, and total load before installation.
What size property is this suitable for?
Ideal for larger homes or properties with higher hot water demand (7 l/min at 30°C rise) than the 11kW model. For very large properties, three-phase models or multiple units should be considered.
Can it work with solar panels?
Yes, when paired with a solar PV diverter it can use surplus solar generation to help heat water, reducing running costs alongside compatible time-of-use electricity tariffs.
How quiet is the boiler in operation?
Very quiet: Strom quote a 15dB sound pressure level, making it suitable for installation near living areas or bedrooms.
Can it also run underfloor heating?
Yes, the boiler's maximum flow temperature of 80°C is compatible with underfloor heating systems, which typically run at lower flow temperatures than radiators for efficient operation.
Who can install this boiler?
Installation must be carried out by a qualified electrician and plumber in accordance with BS 7671 and current UK building regulations, with full electrical and plumbing checks completed before use.
