26 May 2026

9 min read

Electric Boiler vs Gas Boiler UK: Which Is Right for Your Home?

Pipe Assassin Plumbing heating guide — side-by-side modern electric boiler and gas combi boiler in a UK utility room

The UK gas grid is closing. New-build gas connections are being restricted in city centres, the Future Homes Standard prohibits gas boilers in most new builds from 2025, and replacement gas boilers will be banned in new installations from the mid-2030s. If you're replacing a boiler today, the question is increasingly: gas one more time, or jump to electric?

The Honest Running-Cost Comparison

At April 2026 price cap rates, mains gas costs roughly 7p per kWh and electricity costs roughly 25p per kWh. On the face of it, electricity is 3.5x more expensive.

But that comparison is misleading. Three factors close the gap dramatically:

Efficiency: Electric boilers are 99-100% efficient. A modern condensing gas combi is 90-94% — and falls further as it ages and scales up.
Standing charges: A gas connection carries a daily standing charge (~30p/day in 2026, ~£110/year) plus a typical £80-£150 annual gas-safety check. Drop the gas supply entirely and that's £200+/year reclaimed.
Time-of-use tariffs: Economy 7 and similar overnight tariffs offer electricity at 8-12p/kWh during off-peak hours. A heat-leaking unvented cylinder charged overnight delivers most of the next day's hot water at off-peak prices.

Where Electric Boilers Win Outright

Flats and apartments with no gas supply or restrictive gas freeholder rules
Off-grid rural properties currently on oil or LPG — electric is cheaper
Holiday lets, second homes and low-use properties
Any property with solar PV — diversion to the cylinder is free hot water
New builds where a gas connection adds £1-2k to the build cost

Where Gas Still Has a Short-Term Edge

Large, poorly-insulated homes with high heating demand and no solar — pure running cost on a hard cold winter still favours gas
Properties with existing gas combi infrastructure that has 10+ years left — replace like-for-like, defer the switch

Install Cost — What to Expect

Electric boiler only (no cylinder change): £1,450-£2,800 supply and fit, depending on output (4-12 kW) and brand (Hyco, Heatrae Sadia, Elnur, EHC)
Electric boiler + new unvented cylinder: £2,800-£4,500 supply, fit and G3 commission
Like-for-like gas combi: £2,200-£3,500 typical

The electric install is usually faster (no flue, no gas pipework) which keeps labour down. The unit itself is cheaper than a gas combi. Where electric installs get expensive is when the existing consumer unit can't carry the load and an upgrade is required.

Ninja Tip

If you're going electric, pair it with a solar PV diverter on day one. A £350 Eddi or iBoost will pay for itself in 2-3 years on a typical 4kW solar install — and 100% of your summer hot water becomes free.

What Pipe Assassin Won't Do

We are electric-boiler-only specialists. We don't fit gas boilers, we aren't Gas Safe registered, and we don't pretend otherwise. If your honest answer is "gas one more time", we'll tell you to get a Gas Safe engineer and we won't lose any sleep over it.

If your answer is electric — or you're not sure and want a genuine, unbiased conversation — we're your people. G3 certified, WRAS approved, fully insured.

Pipe Assassin — 24/7 Emergency Plumbers

07956 645 527

Rapid 24/7 response. G3 certified. Insured to £5m.

See area-specific install pricing for Enfield, Hertfordshire and Essex.

Frequently Asked Questions

Is an electric boiler cheaper to run than a gas boiler in the UK?

Per kWh, electricity costs more than gas. But electric boilers are 99-100% efficient (vs 90-94% for a modern gas combi), have no annual gas-safety charge, and pair with solar PV diversion and Economy 7 tariffs that drop the effective cost dramatically. For flats, holiday lets and off-grid homes, total cost of ownership is often lower.

Can I replace my gas combi with an electric boiler?

Yes. The gas supply is capped, the new electric unit (and unvented cylinder where required) is fitted, and the system is commissioned to G3. Pipe Assassin handles like-for-like swaps in a single day in most cases.

Do electric boilers work with solar panels?

Yes — and this is where they shine. With a solar PV diverter (Eddi, iBoost or similar), surplus solar generation that would otherwise be exported at a low rate is diverted to heat the cylinder, effectively giving you free hot water during daylight hours.

How long does an electric boiler last in the UK?

A well-installed electric boiler typically lasts 15-20 years, often longer than a gas combi (10-15 years). Fewer moving parts, no combustion residue and no gas-valve assembly all reduce wear. The cylinder it feeds normally outlasts the boiler itself.

Can I run a whole house on an electric boiler?

Yes, with the right sizing. Most UK 3-4 bed homes run comfortably on a 12-15 kW electric boiler paired with a 180-210 litre unvented cylinder. Larger homes scale up to 22 kW. Check your incoming supply — homes still on a single-phase 60A supply may need an upgrade for larger units.

Are electric boilers worse for the environment than gas?

It depends on the grid. As the UK grid decarbonises (renewables now supply over 50% of generation in many months), electric heating's carbon footprint falls every year. Gas is fixed at its combustion emissions. For homes with solar PV, electric is dramatically lower-carbon today.

Need Help Right Now?

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