Electric Boilers Explained: Pros, Cons and Cost

If your gas boiler has just packed in and someone's mentioned an electric boiler as an alternative, you're probably wondering whether that's a genuine option or just a way to avoid a gas engineer. It's a fair question, and the answer depends heavily on your home, your electricity tariff and how much hot water your household actually gets through.

Electric boilers heat water using an internal electric element rather than burning gas. No flue, no combustion, no need for a gas supply at all. That makes them a realistic choice for homes off the gas grid, flats where flueing is tricky, or smaller properties with modest heating demand. Here's what you need to weigh up.

How electric boilers actually work

Instead of a burner, an electric boiler uses immersion-style heating elements to warm water as it passes through, or to heat a cylinder directly. There's no flue to run outside, no annual carbon monoxide risk from combustion, and installation is generally simpler because you're not dealing with gas pipework or ventilation rules. Most are compact enough to fit in a cupboard.

They come in combi, system and regular formats, much like gas boilers. If you're not sure which type suits your setup, our combi vs system vs regular boilers guide covers the differences and applies just as well here.

The genuine pros

• No flue or gas connection needed, useful for flats, park homes or off-grid properties
• Near-silent running, no burner noise, no banging noises from kettling
• Lower maintenance, fewer moving parts than a gas combustion system
• 100% efficient at point of use, none of the heat is lost up a flue
• Compact size, easier to squeeze into small utility spaces

The real drawbacks

The big one is running cost. Electricity in the UK typically costs several times more per kWh than gas, so even though electric boilers convert every unit into heat, the fuel itself is more expensive. For a home with high heating demand, that difference adds up fast over a winter. The Energy Saving Trust has useful guidance on comparing running costs by fuel type if you want to model your own numbers.

Electric boilers also tend to suit smaller properties better. Heating a larger house with multiple bathrooms on electric can mean slower reheat times and higher bills than a comparable gas system. If you're already unsure what capacity you need, our what size boiler do I need guide is worth reading before you commit either way.

What they cost to buy and run

Unit and installation costs for electric boilers are often lower than gas, since there's no flue work or gas safety certification involved, typically landing towards the lower end compared with the ranges in our new boiler cost guide. Running costs, though, usually come out higher over a year unless your household uses relatively little hot water or you're on a favourable electricity tariff. It's worth doing the sums both ways rather than assuming either fuel wins outright.

Is an electric boiler right for your home?

If you're off the gas network, in a small flat, or replacing a boiler where flueing is genuinely difficult, electric deserves serious consideration. If you're on mains gas with a family-sized home and typical hot water demand, a gas or hybrid system is usually the cheaper option long term. Either way, check current models against Which? boiler reviews and confirm any installer you use is Gas Safe registered if gas work is involved anywhere in the job.

Not sure which route makes sense for your property? Get a fixed price and we'll talk you through the options honestly, gas or electric, with no pressure either way.