HeatPumpHow to Choose a Heat Pump Installer
Your heat pump is only as good as its installation. A well-designed, properly installed system will keep your home comfortable for 20+ years. A poorly installed one will underperform, cost more to run, and cause endless frustration. Here's how to find an installer you can trust.
MCS Certification: Non-Negotiable
MCS (Microgeneration Certification Scheme) is the industry standard for renewable energy installations in the UK. You need an MCS-certified installer for two critical reasons:
- BUS grant eligibility: Only MCS-certified installers can apply for the £7,500 Boiler Upgrade Scheme grant on your behalf. No MCS certification = no grant.
- Quality assurance: MCS certification requires installers to meet standards for system design, installation quality, and consumer protection. They're audited regularly.
You can search for MCS-certified installers at mcscertified.com. Enter your postcode and it will show registered installers in your area.
TrustMark Registration
TrustMark is the government-endorsed quality scheme for tradespeople. MCS-certified heat pump installers should also be TrustMark registered. TrustMark provides an additional layer of consumer protection, including access to a dispute resolution service and financial protection if the installer goes out of business.
What to Ask Potential Installers
When requesting quotes, ask these questions:
| Question | Good Answer | Red Flag |
|---|---|---|
| Will you do a heat loss calculation? | "Yes, room by room" | "Not needed" or "We'll estimate" |
| Can I see references? | "Here are 3–5 recent customers" | Evasive or refuses |
| What warranty do you offer? | "5–10 years on parts and labour" | Vague or manufacturer warranty only |
| Will you do a home survey? | "Yes, before quoting" | "We can quote from photos" |
| Which brands do you install? | Multiple brands, recommends based on your needs | Only installs one brand regardless |
| What's the system design? | Specific HP model, cylinder size, radiator plan | Vague or "we'll decide on the day" |
Getting Quotes: The 3-Quote Rule
Always get at least 3 quotes from different MCS-certified installers. This isn't just about finding the cheapest price — it's about comparing system designs. You'll often find that different installers recommend different heat pump sizes, cylinder capacities, or radiator upgrades. The variation tells you a lot about each installer's approach and competence.
Be wary of:
- The cheapest quote by far: May indicate an undersized system, cheaper components, or corners being cut on pipework and controls
- The most expensive by far: May include unnecessary upgrades or premium components that don't justify the cost
- Quotes that arrive without a home visit: A proper quote requires a physical survey of your property
What a Good Quote Includes
A thorough quote should contain:
- Room-by-room heat loss calculation — the foundation of the system design
- Specific heat pump make and model — with output capacity (kW)
- Hot water cylinder — brand, capacity, and whether it includes an immersion heater
- Radiator upgrades — which rooms need new or larger radiators, and which are fine
- Pipework and plumbing — any changes to the existing system
- Electrical work — new circuit, consumer unit upgrade if needed
- Controls — thermostat, zone controls, smart controls
- MCS noise assessment (MCS 020) — confirming compliance with noise limits
- Warranty details — duration, what's covered, parts and labour
- Total price — broken down into components, with and without the BUS grant
- Estimated annual running costs — based on your home's heat demand
Red Flags: Walk Away If...
- No MCS certification — you lose the £7,500 grant and quality assurance
- Pressure to sign today — "this price is only valid until Friday" is a sales tactic, not an installation practice
- No home survey — quoting without visiting your property means the system won't be designed for your home
- No heat loss calculation — this is the most important step in system design. Without it, the heat pump may be wrong-sized
- Refusing to provide references — reputable installers are happy to connect you with previous customers
- Unclear warranty terms — "we'll sort it if anything goes wrong" is not a warranty
- Demanding large upfront deposits — 10–20% deposit is normal. 50%+ before work starts is a concern
Typical Installation Timeline
| Stage | Duration | What Happens |
|---|---|---|
| Home survey | 1–2 hours | Installer visits, measures rooms, checks insulation, assesses pipework |
| System design | 1–2 weeks | Heat loss calculation, system specification, quote preparation |
| Quote review | 1–2 weeks | You compare quotes, ask questions, make a decision |
| Scheduling | 2–8 weeks | Wait for installation slot (busy periods: autumn/winter) |
| Installation | 2–5 days | Outdoor unit, indoor components, pipework, electrical, commissioning |
| MCS registration + BUS | 1–2 weeks | Installer registers the system and applies for the grant |
Total from first enquiry to a working heat pump: 6–16 weeks. Plan ahead, especially if you want to install before winter. The busiest period for installers is September to November.
After Installation: What to Expect
Your installer should provide:
- A full handover showing you how to operate the system and controls
- MCS certificate and documentation
- Warranty documentation
- Annual servicing schedule (recommended: once per year, £100–£200)
- Confirmation the BUS grant application has been submitted
Related Guides
Frequently Asked Questions
What is MCS certification and why does it matter?
MCS (Microgeneration Certification Scheme) is the quality standard for renewable energy installations in the UK. Only MCS-certified installers can apply for the £7,500 BUS grant on your behalf. MCS certification means the installer meets standards for design, installation, and consumer protection.
How many quotes should I get for a heat pump?
Get at least 3 quotes from different MCS-certified installers. This lets you compare system designs, not just prices. A significantly cheaper quote may mean a smaller system or corners being cut. A significantly more expensive quote may include unnecessary extras.
What should a good heat pump quote include?
A proper quote should include: a room-by-room heat loss calculation, the specific heat pump make and model, hot water cylinder specification, any radiator upgrades needed, pipework and electrical work, MCS certification details, warranty terms (at least 5 years), and the total cost with and without the BUS grant.
How long does a heat pump installation take?
A typical air source heat pump installation takes 2–5 days. The timeline is: home survey (1–2 weeks before), system design (1 week), installation (2–5 days), MCS registration and BUS grant application (1–2 weeks after). Total from first contact to working system: 4–8 weeks.
What are red flags when choosing a heat pump installer?
Watch out for: no MCS certification, pressure to sign immediately, no home survey or heat loss calculation, unwillingness to provide references, vague warranty terms, quotes that seem too cheap (may mean undersized system), and installers who push a single brand regardless of your needs.