In 2026, the average electric boiler installation cost in the UK ranges from £2,500 up to £6,000. This is because replacing a gas boiler with an electric one often requires a few important changes such as unit upgrades, pipework adjustments, and sometimes a switch to 3-phase power. However, if this isn’t what you’d planned for, an alternative option is installing independent electric radiators, which need no plumbing and can be fitted in a single day.
To provide some reassurance, if you’ve just been quoted £5,000, £6,000, or more for an electric boiler installation, you haven’t been ripped off — but you have been quoted for a bigger job than you probably expected. All in the name of improving your home’s energy efficiency! This is why the cost to replace a gas boiler with an electric boiler can feel higher than expected, especially when electrical upgrades and existing pipework are included.
The good news: there’s a reason that quote is what it is, but there is another electric heating solution you could install, without the need to go anywhere near a gas boiler-shaped replacement. Here’s where every pound of your quote actually goes.
So, how much does an electric boiler cost to install once the unit, labour and electrical upgrades are all included?
The true cost of installing an electric boiler in 2026
Here’s the part most installers won’t explain in the quote itself: an electric boiler isn’t a like-for-like swap with your gas boiler. It’s three separate jobs wrapped up in one invoice:
- The electric boiler unit: Costing around £1,000–£3,000 (and likely the amount you were expecting). The price of an electric boiler scales with the kW output. For example, a compact unit for a flat sits at the bottom of that range, whereas a larger electric boiler for a home with two or more bathrooms sits at the top of the scale.
- The hidden electrical upgrade: £1,800–£3,000+. This is likely what the rest of the quote covers, and when it comes to electrics and your home efficiency, it’s worth knowing why.
Standard UK homes run on a single-phase electricity supply. That’s fine for a gas boiler, which only uses electricity to run its controls and pump. A large electric boiler over 14kW needs electricity to do the actual job of heating your water, which means it draws far more current — often more than a standard single-phase supply can handle safely.
Past that threshold, your installer has to apply to your local Distribution Network Operator (DNO) for a 3-phase power upgrade. That’s a separate job, billed separately, and the single biggest reason why electric boiler quotes can creep past £4,000.
- Labour: For electric boiler installation, you need both a plumber and an electrician. Swapping a gas boiler for another gas boiler is usually a one-person job. Whereas for an electric boiler, a certified electrician handles the consumer unit and wiring, and then the plumber flushes and adapts your existing wet central heating pipework, which was designed around a gas system.
So if your boiler quote came in at £5,000+, the need for two trades people, a unit, and possibly a grid upgrade are all considered into the final job.
Electric radiators vs electric boilers
When comparing electric radiators vs an electric boiler, the biggest difference is that radiators do not rely on shared pipework or a wet central heating system. They heat rooms independently, which can make installation simpler and less disruptive than replacing a gas boiler with an electric boiler.
| Comparison point | Electric Boiler | Electric Radiators |
|---|---|---|
| Installation time | 3–5 days (plumbing, electrical work, DNO sign-off if 3-phase is needed) | 1 day installation — simple spur connection per radiator, no plumbing required |
| Hidden costs | 3-phase power upgrades, consumer unit changes, powerflushing old pipework | None — each radiator is individually wired, no shared pipe network |
| Maintenance | Few moving internal parts, though an annual service is best | Zero moving parts, no annual service required |
| Disruption | Water shut off, walls and floors accessed for pipework | Room-by-room: other rooms stay usable throughout |
With electric radiators, you’re able to upgrade your home in just one day as they’re wired independently rather than plumbed into a shared network. There’s nothing that requires an installer to upgrade the supply.
Plus, since Fischer’s radiators are individually controlled via a smart wireless thermostat, you’ll only heat rooms you’re actually using rather than wasting previous energy warming spaces that aren’t occupied.
Electric running costs: the 2026 reality
When it comes to upgrading your home to electric heating solutions, it’s only natural to think “will an electric home be more expensive to run?”.
With the July 2026 energy price cap increasing by 13%, electricity stands at 26.11p/kWh, so cost is naturally a key consideration for any property owner. However, the impact of heating your home on your energy bills is influenced by much more than fuel price alone. It’s how much usable heat the system actually delivers to a room per unit of electricity you’ve bought.
The hidden heat loss of wet heating systems
An electric boiler still has to push electrically heated water through your home’s existing wet heating system to reach every radiator. In an older property, the pipe run is unlikely to be well insulated, so heat can be lost in transit through floors, walls, and into spaces you were never trying to heat — all before it reaches the room it’s required.
The difference with Fischer 40mm HeatCore
The difference with Fischer’s electric radiators is the use of 40mm ceramic HeatCore — a thermal mass that stores heat directly inside the room it’s heating, and then radiates it to reach every corner.
There’s no pipe run between where the heat is generated and where it’s needed, bypassing the heat loss of a wet system entirely. So there’s no heat being wasted passing through a pump cycling water around, and nothing hidden in the walls quietly losing you money. The heat is made and stored exactly where you’re going to feel it.
Electric Boiler vs Electric Radiator FAQs
Is it cheaper to install electric radiators or an electric boiler?
Installing electric radiators can be cheaper than installing an electric boiler. Energy efficient radiators bypass the plumbing modifications, powerflushing, and potential 3-phase electrical upgrades that drive up electric boiler installation costs. Because each radiator is wired independently, there’s no shared pipe network to upgrade.
What are the disadvantages of an electric boiler?
Beyond the installation cost, there may be disadvantages installing electric boilers due to capacity — most struggle to supply enough hot water quickly for larger homes with multiple bathrooms. Unless you’re also upgrading to electric radiators, they also still depend on a home’s existing wet radiator pipework to heat your home, as well as provide hot water. So old, poorly insulated pipes can waste energy before it ever reaches a room.
Can I replace my gas boiler with an electric boiler easily?
Electric boilers are easy to install but may require some additional work to ensure your home can fully benefit from an energy efficient system. While an electric boiler can often fit into a similar space compared to a gas boiler, the electrical requirements are very different. For example, large homes may need more than a 14kW boiler, and therefore require full 3-phase power supply to handle the load safely.
Book a free home survey and avoid changing your plumbing
Avoid the hassle of changing your pipework to upgrade your home. Book a free home survey today and find out how Fischer can upgrade your heating in just one day — no pipework, no powerflushing, and no 3-phase upgrade required. Check out the full range of Fischer’s electric heating products to see what’s right for your property.