Do electric boilers need special wiring?

Yes, most electric boilers need dedicated wiring because they use a high amount of electrical power. They can’t be connected like a standard plug-in appliance. Even smaller electric boilers usually need their own electrical circuit from the consumer unit, with the correct cable size and protective device.

Smaller output electrical boilers with an output of up to 15 kW can be powered by a single-phase / 240-volt supply. 

Larger electric boilers may require heavier cabling, a higher-rated supply, or a three-phase electrical connection. The requirement depends on the boiler output and the electrical capacity of the property.

Before installation, a qualified electrician should verify the incoming electrical supply, main fuse, consumer unit, earthing, bonding, cable routes, and the total load already being used in the building. You should also consider other high-power appliances, such as electric showers, ovens, EV chargers, immersion heaters, and heat pumps and their amp consumption on the electrical system.

Correct wiring is essential. Poor or undersized wiring can cause tripping, overheating, poor performance, or unsafe operation.

For more detailed information on our electric boilers, please see the following webpage – Central heating with an electric boiler