Electric Boilers

When selecting an electric boiler, size is determined by its energy output in kilowatts (kW) rather than physical size. The more kW, the more taps and radiators it can supply.

Electric boilers typically have a much lower power output than gas or oil boilers and generally have a maximum output of 15 kW. As a guideline, you should have 1.5 kW for every radiator in your home. For example, a home with six radiators should get a 9 kW electric boiler. However, many factors such as ceiling height, single or double glazing and insulation can affect this, so it is best to speak to a qualified professional. The Elnur Mattira MAC15 Combi Boiler has a selectable output of 3kW to 15kW, making it ideal for a range of properties.

Electric boilers are connected to the mains electricity to provide central heating and hot water. When hot water is needed, cold water is passed through an electric heating element to warm it, much like a kettle. This heated water is then pumped to radiators or taps as required. An electric combi boiler is a single unit that is usually hung on the wall and combines the functions of a gas combination boiler. This type of electric boiler heats the water on demand and is great for saving space as a water storage tank is not required.

A high quality electric boiler consumes less energy than a gas boiler and is close to 100% efficient, meaning virtually all of the energy it uses is converted into heat. Gas boilers are generally around 90% efficient.

Electric boilers have a much lower energy output than gas boilers, offering a maximum of around 15kW, compared to gas boilers which are available up to 35kW.

Electricity costs for operating an electric boiler can vary depending on its usage and efficiency. Direct debit customers are currently paying around 34.04p per kWh for electricity under the Energy Price Guarantee. To help you estimate the cost of operating an electric boiler, we've used this figure to calculate the cost of heating with an electric boiler via a standard central heating radiator system and assumed the system is used for six hours a day. We've used a margin of efficiency based on the efficiency of your radiators. Remember that a well insulated home, lowering the temperature on the thermostat and turning the heating system off regularly can reduce your costs.

Electric boilers can be considerably more cost-efficient when they are connected to a solar panel system, potentially saving you a lot of money. With a solar battery system, you can even store energy during the day for use with your boiler when you need it. Linking an electric boiler with solar thermal capabilities - such as the MAC15 - can save you up to £80 a year. Additionally, electric boilers running costs can be reduced if energy is exported back to the national grid.

Electric Combi Boilers are a great option for properties with a low to average hot water demand and for homeowners who are looking to reduce their environmental footprint.

Electric combi boilers are the quickest and cheapest type of boiler to install. This efficient heating system heats water on demand, utilising a heating element similar to a kettle to heat cold water. This means you receive hot water on demand rather than having to store it in a bulky water storage tank, saving you space, energy and money.

Supply and install typically £1,500–£3,500 (2026 UK average), depending on model, existing pipework and electrician.

Very low—no annual service required. Descale heating element every 2-5 years in hard water areas. Check pressure and expansion vessel periodically. Lifespan 10-20 years with good care.

Ideal for no-gas properties, flats, small/medium homes, well-insulated builds, or solar-equipped houses.

Electricpoint has been supplying electrical products for many years and is now one of the UK’s largest online electrical wholesalers.

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