Best heat pump installers in the UK: how to choose one (2026)
There is no single best heat pump installer in the UK — the right firm depends on your property, your region and the system you need. What does not change is the checklist. This guide shows you exactly what separates a competent MCS-certified installer from a firm that will leave you with an oversized, expensive system that never quite heats the house.
- MCS certification — the gateway to grant eligibility
- A room-by-room heat loss survey — not a guess from your floor area
- Three itemised quotes — compared line by line, not on headline price
Get 3 Free Heat Pump Quotes
Compare quotes from vetted UK heat pump installers with MCS certification and air source experience.
- ✓ MCS-certified installers only
- ✓ Room-by-room heat loss surveys
- ✓ Free, no-obligation quotes
Why we do not publish a ranked list of installers
Search “best heat pump installers UK” and you will find plenty of numbered lists with star ratings attached. Treat them with caution. Heat pump installation is an intensely local trade: a firm that does excellent work in Devon is irrelevant to a homeowner in Fife, and the national brands subcontract to regional teams whose quality varies enormously from postcode to postcode.
What actually predicts a good outcome is not a brand name. It is whether the installer is properly certified, whether they survey your house before pricing it, and whether their quote is specific enough to hold them to. That is what the rest of this guide covers.
The accreditations that matter
Heat pump work sits across several trades, so more than one badge is relevant.
| Accreditation | What it covers | How important |
|---|---|---|
| MCS (Microgeneration Certification Scheme) | Design, installation and commissioning of renewable heating to a recognised standard | Essential — and required if you want to claim a government grant |
| NICEIC (or equivalent electrical scheme) | The electrical side: supply, isolation, controls, Part P notification | Very important — heat pumps are a significant electrical load |
| OFTEC | Heating installers with a renewables registration; common where an oil boiler is being replaced | Useful, particularly off the gas grid |
| TrustMark | Government-endorsed quality scheme with consumer protection | A helpful additional signal |
| Manufacturer training | Accreditation for the specific brand being fitted | Matters for warranty length and support |
Always verify the MCS number yourself
An installer can say they are “MCS registered” when in fact they are working loosely under someone else's certificate. Ask for the certificate number and check it on the MCS register before you sign anything. If a grant is involved, the certificate must belong to the firm doing your installation.
Grants: what to ask about
A government grant is available in the UK towards the cost of replacing a fossil-fuel boiler with a heat pump, subject to eligibility and to using an MCS-certified installer. Scheme values and rules change, so do not take a salesperson's figure at face value. Instead, ask each installer three things: whether your property qualifies, whether they will handle the application on your behalf, and whether the quoted price is shown before or after the grant is deducted. Quotes that silently mix the two are impossible to compare.
Typical 2026 heat pump installation costs
These are realistic UK market ranges for a fully installed system before any grant is applied. Your figure depends far more on the state of your existing radiators, pipework and hot water storage than on the heat pump itself.
| System | Typical property | 2026 installed cost |
|---|---|---|
| Air source heat pump, 5–8kW | 2–3 bed semi, reasonable insulation | £7,000 – £12,000 |
| Air source heat pump, 8–12kW | 3–4 bed detached | £10,000 – £15,000 |
| Air source heat pump, 12–16kW | Large or poorly insulated home | £13,000 – £20,000 |
| Ground source heat pump (boreholes) | Any size, needs land or drilling access | £20,000 – £35,000 |
| Hot water cylinder replacement | Where the existing cylinder is unsuitable | £1,000 – £2,000 |
| Radiator upsizing | Per radiator, fitted | £150 – £400 |
For a fuller breakdown of what drives these numbers, see our 2026 heat pump installation cost guide.
The single most important test: the heat loss survey
A competent installer will not price your job from a phone call. They will carry out a room-by-room heat loss calculation, measuring each room, noting insulation levels, window types and orientation, and producing a design flow temperature and a radiator schedule. This is the difference between a heat pump that runs efficiently at a low flow temperature and one that is permanently working too hard.
If someone quotes you a kilowatt rating without visiting the property, or sizes the unit from the old boiler's output, that is a red flag rather than efficiency. Boilers are routinely oversized by a large margin; copying that number across guarantees an oversized heat pump, a higher bill and a worse experience.
What a good quote actually contains
- The heat pump make, model and output in kW — not just “air source heat pump”
- The design flow temperature the system is sized around (lower is better for running costs)
- A room-by-room radiator schedule showing which emitters are being changed
- Hot water cylinder size and whether it is being replaced
- Electrical works, including any consumer unit or supply upgrade
- Pipework, buffer or volumiser, and controls
- Estimated seasonal performance, and the assumptions behind it
- Warranty terms for the unit and for the workmanship, stated separately
- Price before grant, grant amount, and price after grant, shown as separate lines
Red flags
- No survey before a fixed price is offered
- A large upfront deposit — a modest deposit is normal, half the job value is not
- Pressure to sign today for a discount that expires
- Vague grant claims with no confirmation that your property qualifies
- No MCS certificate number, or one that belongs to a different company
- Refusal to put the design flow temperature in writing
- Cold-call or doorstep origination rather than a quote you requested
Questions to ask every installer
- What is your MCS certificate number, and is the install carried out by your own team or subcontracted?
- What design flow temperature have you sized the system to, and why?
- How many radiators need changing, and is that included in the price?
- What is the workmanship warranty, and who honours it if you cease trading?
- What happens if the system underperforms in the first winter?
- Can you show me the heat loss calculation for my property?
How to compare three quotes fairly
Line the quotes up on the points above rather than on the total. The cheapest quote is frequently the one that has left the radiator upgrades out, sized the unit optimistically, or assumed your existing cylinder is fine when it is not — costs that will reappear mid-project. A quote that is £2,000 higher but includes six upsized radiators and a new cylinder is usually the cheaper job in reality.
Three quotes is the sweet spot. One gives you no reference point; five wastes everyone's time and rarely changes the decision.
FAQs: choosing a heat pump installer (UK, 2026)
What certification should a heat pump installer have?
MCS certification is the key one, covering design, installation and commissioning to a recognised standard, and it is required if you want to claim a government grant. Alongside it, look for a competent electrical registration such as NICEIC, and manufacturer training for the specific unit being fitted.
How much does heat pump installation cost in the UK in 2026?
A typical air source heat pump installation runs from about 7,000 pounds to 15,000 pounds before any grant, depending on the size of the property and how much radiator and cylinder work is needed. Ground source systems generally run from 20,000 pounds to 35,000 pounds because of the groundworks involved.
Do I need an MCS-certified installer to get a heat pump grant?
Yes. A government grant is available towards the cost of a heat pump, but eligibility depends on the property and the installation being carried out by an MCS-certified installer. Ask the installer to confirm your property qualifies before you commit.
How many heat pump quotes should I get?
Three. Each should follow a room-by-room heat loss survey of your property, and each should state the design flow temperature, the radiators being changed and the price before and after any grant, so you can compare them line by line.
What are the biggest red flags when choosing an installer?
Quoting a fixed price without surveying the property, sizing the heat pump from your old boiler's output, demanding a large upfront deposit, pressuring you to sign the same day, and being unable or unwilling to give you an MCS certificate number you can verify.
Compare MCS-certified installers near you
Tell us about your property and we will match you with vetted heat pump installers who will survey it properly before quoting.