Heat pump cost calculator
See what a heat pump really costs your home
Answer five quick questions and get an honest estimate in seconds — system size, install cost, the government grant, and your cost after it's deducted. No jargon, no contact details needed to see your figures.
- Free & instant
- £7,500 grant included
- MCS-certified installers
Estimate your heat pump cost
Figures verified June 2026 · re-checked at each update
Your indicative estimate
Estimated cost after the grant£—
System size
~— kW
Install cost before grant
£—
Boiler Upgrade Scheme grant
£—
Running cost vs now
—
This is an indicative estimate. Your grant is deducted by the installer from the invoice before you pay — you don't claim it back. A fixed price needs a free MCS heat-loss survey of your home.
Get your detailed breakdown and a fixed quote
A local MCS-certified installer will send a full breakdown and arrange a free heat-loss survey. No obligation.
- MCS-certified installer
- Grant handled for you
- 0% VAT
- No obligation
Thanks — your breakdown is on its way
A local MCS-certified installer will be in touch shortly to confirm your figures and arrange a free heat-loss survey. Nothing to pay, no obligation.
What drives the cost of a heat pump
A heat pump is sized to your home's heat loss, and that size is the single biggest factor in the price. A small flat needs a 4–5 kW unit; a large detached house might need 14 kW. The calculator above estimates this from your property type, bedrooms and insulation — a rough stand-in for the proper heat-loss survey an installer carries out before quoting.
Beyond size, a few things move the number:
- Insulation. A well-insulated home needs a smaller, cheaper system and runs it for less. A draughty home needs more.
- Radiators. Heat pumps run cooler than gas boilers, so some rooms need larger radiators. Many homes need a few changed, not all.
- Hot water cylinder. Most installs include a new cylinder, which is built into the ranges shown.
- Your current heating. This decides your grant amount and how much you stand to save on running costs.
The grant, in brief
The Boiler Upgrade Scheme takes a fixed amount straight off your installation invoice. You don't claim anything back or wait for a cheque.
Standard grant
For air source or ground source heat pumps replacing mains gas or electric heating in England & Wales.
Off-grid uplift
A higher amount for off-gas-grid homes on oil or LPG, available 21 Jul 2026 – 31 Mar 2027.
VAT on installation
Heat pump installations currently carry zero VAT — a saving already reflected in installer pricing.
Read the full eligibility rules on our Boiler Upgrade Scheme page.
Common questions
How much does a heat pump cost in the UK?
Most air source heat pump installations cost roughly £9,000 to £19,000 before the grant, depending on the size of system your home needs. The £7,500 Boiler Upgrade Scheme grant is deducted by the installer before you pay, bringing the typical net cost down to around £2,000 to £12,000. The calculator gives you a range for your specific property.
What is the Boiler Upgrade Scheme grant?
It's a government grant of £7,500 toward an air source or ground source heat pump in England and Wales, with a temporary £9,000 amount for off-gas-grid oil and LPG homes. Your MCS-certified installer applies for it and takes it off your invoice, so you never handle the paperwork or pay it upfront.
Will a heat pump save me money on my bills?
It depends on what you heat with now. Replacing oil, LPG or direct electric heating usually cuts running costs noticeably. Against mains gas, running costs are often close to neutral — the main reasons to switch from gas are the grant, comfort and lower carbon, not big bill savings. We won't pretend otherwise.
Is my home suitable for a heat pump?
Most homes are, including older and terraced properties. Good insulation helps, and some homes need larger radiators. The only way to know for certain is a free MCS heat-loss survey, which the installer carries out before giving you a fixed price.
Are these estimates accurate?
They're a well-grounded starting point based on real installer pricing, but they're indicative. Your exact price depends on your home's measured heat loss, your existing pipework and radiators, and where the unit goes. A free heat-loss survey turns the estimate into a fixed quote.