Electric Boiler Costs UK: Installation and Running Costs

The Centre for Sustainable Energy puts electric boiler installation at £3,000 to £6,000. That is a useful planning range, but the bigger question is what happens after installation. In our worked example, a home needing 12,000 kWh of heat a year spends £3,000 on electricity at an illustrative tariff of 25p/kWh.

An electric boiler can solve an awkward heating problem: no gas connection, nowhere for a flue, or a small home where keeping the existing radiators matters. It can also be an expensive way to heat a draughty house. Before buying one, compare the full installation quote and annual energy use with the alternatives.

How much does an electric boiler cost to install?

The Centre for Sustainable Energy’s installation benchmark is £3,000 to £6,000. Its advice was reviewed in June 2026. Treat this as a budgeting reference, not a fixed quote: the page does not itemise VAT, electrical upgrades or the equipment included in every installation.

A named installer gives a more specific example. Advanced Heating & Plumbing, covering Watford and surrounding areas, advertises £1,500 to £3,000 plus VAT for an installation including the boiler, fitting and commissioning. It requires a survey, and unforeseen work can cost extra. That is one company’s offer, not a UK average.

The difference is why you should compare written scopes of work. A replacement using suitable existing pipework and electrics is a different job from putting central heating into a home that has neither.

For the wider comparison with gas and oil, see our guide to new boiler installation costs. Here, the focus is direct electric boilers that heat water for radiators or wet underfloor heating.

What pushes electric boiler installation costs up?

The expensive part may be adapting your home, rather than buying the boiler. Ask the installer to separate the appliance from electrical work, hot-water storage and changes to the heating system. That makes a cheaper quote easier to assess: you can see whether it leaves out something you will still need.

Electrical supply and other large appliances

An installer needs to assess the boiler alongside the rest of the home’s electrical load. Mention an electric shower, EV charger or other large appliance at the survey. Do not buy a higher-output model before the installer has confirmed that your supply can support it and priced any required work.

Hot water, cylinders and cupboard space

Ask how the proposed system will supply your taps and showers. A heating-only flow boiler and a package with hot-water storage are different purchases. Check cylinder space, usable hot-water capacity and recovery time. The word “combi” alone does not tell you whether the system will meet your household’s demand.

Pipework, radiators and the old heating system

Existing radiators may be reusable, but their condition and output still need checking. Ask whether the quote includes flushing, controls, removal of the old appliance and making good afterwards. If you are replacing gas heating, the gas work must be handled by an appropriately registered engineer.

How much does an electric boiler cost to run?

Start with the amount of heat your home needs over a year. A direct electric boiler turns electricity into heat; it does not multiply the heat delivered in the way a heat pump can. Energy Saving Trust explains why that makes ordinary electric heating expensive to run, despite its high efficiency at the point of use.

The following is a calculation, not a forecast of your bill. We assume electricity at 25p/kWh, gas at 7p/kWh, an electric boiler delivering one unit of heat per unit of electricity, a gas boiler at 90% efficiency and a heat pump with a seasonal performance factor of 3. These are illustrative inputs, not current price-cap rates or guaranteed efficiencies.

Figures are rounded to the nearest pound. They exclude standing charges, installation, maintenance and distribution or storage losses. Heat demand includes whichever heating and hot-water loads you put into the calculation. The rows are scenarios, not estimates for particular bedroom counts.

For the middle row, the electric calculation is 12,000 × £0.25 = £3,000. The heat-pump calculation is 12,000 ÷ 3 × £0.25 = £1,000. Using the same heat demand makes the comparison useful. Comparing two unrelated households’ bills does not.

If you are using an old gas bill as a starting point, its kWh figure is fuel purchased, not useful heat delivered. Cooking, boiler efficiency and any change in comfort or occupancy affect the estimate. Ask your installer for an annual heat-demand estimate and check how they reached it.

What does that mean per month or per hour?

Our £3,000 annual example averages £250 a month, but consumption will be much heavier in winter. A 9kW boiler drawing its full rated power for one hour uses 9kWh, costing £2.25 at the assumed tariff. It will not necessarily draw full power for every hour the heating is enabled.

You can explore different inputs with our boiler running-cost calculator. Use the unit rate on your own bill. Ofgem’s published rates vary by region and payment method; the headline household price cap is not a maximum heating bill.

Will a cheaper electricity tariff solve the running-cost problem?

A lower unit rate helps, but a cheap overnight rate is useful only for electricity you can actually use overnight. A flow boiler serving radiators on a cold evening cannot retrospectively buy that electricity at the previous night’s price. Check when the system draws power before choosing a tariff.

A system designed to store heat can shift some consumption to cheaper hours. It needs enough storage, suitable controls and an assessment of heat losses. Heating a domestic hot-water cylinder overnight does not automatically store enough energy to heat the whole home the next day.

For a simple sensitivity check, our 12,000kWh example costs £2,400 at 20p/kWh, £3,000 at 25p and £3,600 at 30p. Those are assumed flat rates. With a two-rate tariff, calculate daytime and overnight consumption separately, then add the standing charge.

Should you choose an electric boiler or a heat pump?

Get a heat-pump assessment before committing to direct electric heating if you have a substantial annual heat demand. Energy Saving Trust identifies heat pumps as an option with lower long-term running costs. Whether a heat pump is worth the cost depends on the property, installation design and the price of the complete system.

An electric boiler deserves consideration where heat demand is low, existing radiators can stay and a heat pump is impractical. It is harder to justify on running costs alone in a home that needs a lot of heat. In that situation, paying less upfront can leave you with the more expensive system to live with.

Compare air-source heat-pump installation costs after any grant you qualify for. The Boiler Upgrade Scheme in England and Wales offers £7,500 towards an eligible air-to-water heat pump. It does not fund an ordinary resistance electric boiler. Check eligibility before treating a grant as part of your budget.

If your home loses heat quickly, compare the cost of reducing that demand too. Our home insulation cost guide explains the main options. Insulation and heating controls matter whichever appliance supplies the heat.

What should an electric boiler quote include?

A useful quote gives you a complete installation price and enough detail to estimate the bill afterwards. Ask each installer to price the same job, with the same hot-water requirement. If one proposal is much cheaper, find the difference in its scope before assuming you have found better value.

• System design: the heat-loss assessment, exact boiler model and output, plus the proposed hot-water arrangement.
• Electrical work: the supply assessment, circuit and control work, and responsibility for any network upgrade.
• Plumbing: cylinder, pipework, radiators, flushing and anything to be reused.
• Handover: commissioning, controls demonstration, certification where required and warranty registration.
• Total price: VAT, removal, disposal, making good and every exclusion.
• Ongoing costs: expected annual energy use, tariff assumptions and servicing needed to keep the warranty valid.

Our advice is to settle the annual running-cost estimate before choosing the model. If the bill looks comfortable and the installation solves a real constraint in your home, an electric boiler may be a sensible purchase. If the numbers only work with an unrealistically cheap tariff, keep looking.

How we researched this guide

We checked CSE’s published installation benchmark, a named installer’s advertised scope and price, Energy Saving Trust’s heating advice and government grant guidance on 8 September 2026. The running-cost table is our own calculation with every input stated. We have not surveyed installers nationwide or tested boilers in homes.

Last checked: 8 September 2026. Installation prices depend on the survey. Illustrative energy rates are not a current tariff offer.

Laura Bennet

Home Energy & Sustainability Editor

Laura leads coverage on home energy, heating, and sustainable living. With over 12 years in the UK energy sector, she writes about boilers, solar panels, insulation, and eco-friendly upgrades that reduce household costs.

Reviewed by

Tom Reynolds

Business Energy Specialist