The Biasi Pro-Electric 25kW Three Phase Electric Combi Boiler (BIPROELEC25C) is the highest-output combi in the Pro-Electric range: a wall-mounted, flueless electric combi for larger homes with higher hot water demand. It runs from a 400V three-phase supply drawing 36A and is a direct replacement for a gas combi, using the same pipework and radiators.
Biasi's suitability chart rates the 25kW combi for radiators, taps, showers and baths, and the listing quotes 12 litres per minute of hot water. Power modulates from 2kW to 25kW, and it has an integrated pump and 6-litre expansion vessel with a touchscreen control panel.
25kW
Max Output
2-25kW
Power Modulation
12 L/min
Hot Water Flow
36A
Full-Load Current
40A
Recommended Breaker
3 Years
Warranty
Fittings Pack Sold Separately
The Biasi Combi Fittings Pack (Ei1124503) is optional and not included with this boiler. Add it to your order if you need the fittings.
Three Phase Supply Required
This boiler needs a 400V three-phase (3N~) supply and is not compatible with standard single-phase domestic wiring. Confirm a three-phase supply is available before ordering.
Electrical Supply Check Before You Order
This model draws 36A at full load on a 400V three-phase supply and Biasi recommend a 40A breaker with 3 x 6mm² cable. Biasi require a voltage and load test calculation to confirm the breaker size and that the property supply can carry the load before installation.
Three Phase, Lower Current
Spreading the load across three phases keeps the draw to 36A, with a 40A breaker and 3 x 6mm² cable.
Multi-Outlet Hot Water
Rated by Biasi for taps, showers and baths, with 12 L/min quoted on the listing.
2-25kW Modulation
Output modulates from 2kW to 25kW, close to 100% efficient with no combustion losses.
No Flue, Fit Anywhere
No flue, no gas and no condensate drain, so it can be sited wherever the supply reaches.
Direct Gas Combi Replacement
The same ¾" heating and ½" hot water connections as a gas combi reuse existing pipework.
Integrated Pump and 6L Vessel
A 6-litre expansion vessel, circulating pump and touchscreen controls are factory-fitted.
Technical Specification
Identity
Manufacturer
Biasi
Model / MPN
Pro-Electric 25kW Combi, BIPROELEC25C
Boiler Type
Wall-mounted electric combi (heating and hot water)
Fittings Pack (optional)
Ei1124503 - sold separately
Electrical
Supply
Three phase 400V, 50Hz
Current at Full Load
36A
Recommended Breaker
40A
Recommended Cable
3 x 6mm²
IP Rating
IPX4
Performance
Max Output
25kW
Power Modulation
2kW to 25kW
Hot Water Flow
Up to 12 litres/min
Max / Min Heating Pressure
2.5 bar / 0.5 bar
Flow Temperature
30-80°C
Connections and Size
Heating Connections
¾" male
Hot Water Connections
½" male
PRV Connection
15mm
Dimensions
630 x 380 x 230mm (H x W x D)
Warranty and Standards
Warranty
3 years, registered within 45 days
Standards
BS EN 12828, BS EN 12831, BS EN 14336, BS 7671
Warranty and Installation Requirements
The 3-year Biasi warranty is only valid if the boiler is installed by a competent, registered installer, a Part P electrical certificate is issued immediately after the live connection, the guarantee is registered within 45 days of purchase, the appliance is serviced annually by a registered electrician, and a magnetic filter is fitted to the heating return. Biasi state they accept no responsibility for failures where these terms are not met.
Frequently Asked Questions
Is the fittings pack included?
No. The Biasi Combi Fittings Pack (Ei1124503) is optional and sold separately.
Why does it need a three-phase supply?
At 25kW the boiler is wired for 400V three-phase, which keeps the current to 36A rather than the very high draw a single-phase unit of this output would need.
Can it fill a bath?
Biasi's suitability chart rates the 25kW combi for baths as well as taps, showers and radiators, unlike the single-phase 12kW and 14kW combis.
What breaker and cable do I need?
Biasi recommend a 40A breaker and 3 x 6mm² cable, and a voltage and load test calculation is required before installation.
Is a filling loop required?
Sources conflict on this point, so confirm with Biasi or your system designer how the system should be filled and pressurised.
