Heat Pump Servicing: What's Involved and How Often
Heat pumps need annual servicing much as boilers do — for warranty compliance, efficiency and longevity — but the work differs: no combustion checks, and instead a focus on refrigerant circuit performance, airflow, system water quality, controls settings and the cylinder. Typical cost is £100–£180 a year. The efficiency stakes are higher than with a boiler, because a heat pump drifting from its design settings costs you across every kWh it delivers.
What an annual service covers
Outdoor unit: coil and fins cleaned of leaves, dust and debris (airflow is efficiency), fan operation checked, condensate drainage and defrost cycle verified, mountings and clearances inspected. Refrigerant circuit: operating pressures and temperatures checked for signs of leakage or degradation — a heat pump losing refrigerant loses efficiency long before it stops working, which is precisely the failure mode annual checks exist to catch.
System side: water quality and inhibitor (heat pumps care about clean system water just as boilers do), pressure and expansion vessel, filter cleaning, cylinder operation and immersion backup, and — importantly — a review of controls and flow temperature settings against the design. Efficiency drifts when settings get changed, and reverting them is often the most valuable thirty seconds of the visit.
How it differs from boiler servicing
No combustion means no flue-gas analysis, no gas pressure checks and no carbon monoxide dimension for the heat pump itself — a genuine simplification. What replaces it is refrigerant-circuit assessment, which requires specific competence: F-gas qualifications apply to work on sealed refrigerant circuits, so the engineer's credentials differ from a Gas Safe card even though both are annual visits with a certificate at the end.
The other difference is the efficiency focus. A boiler at 88% instead of 90% costs you a little; a heat pump at SCOP 2.8 instead of 3.6 costs you a lot, because everything runs through that multiplier. Good heat pump servicing therefore includes a performance conversation — is it achieving what the design intended, and if not, why — rather than just a cleanliness check.
Costs and warranty
Annual servicing typically runs £100–£180 — comparable to boiler servicing, sometimes slightly more where refrigerant checks are involved. Manufacturer warranties on heat pumps commonly run 5–7 years, extending further on some models through accredited installation, and are conditional on documented annual servicing exactly as boiler warranties are. Keep records; the same claim-time scrutiny applies.
MCS-certified installations also come with commissioning documentation showing the design flow temperatures and settings. Keep that with the service records — it's the reference an engineer needs to tell whether current settings match the design, and it's the paperwork buyers and their surveyors will ask about later.
Keeping efficiency high between services
Owner tasks are light: keep the outdoor unit clear of leaves, snow and vegetation (a foot of clearance is a reasonable habit), don't build storage or fencing that obstructs airflow, check the system pressure occasionally as with any sealed system, and resist boiler-style habits — heat pumps reward steady scheduled running with modest setbacks rather than sharp on/off cycles.
The biggest self-inflicted efficiency loss is turning flow temperatures up. It feels intuitive when a cold snap arrives, and it drops your SCOP for as long as it's left there. If the house isn't holding temperature at design settings, that's a diagnosis question for your installer, not a dial to override permanently — the whole design exists to make the low temperature sufficient.
| Item | Detail |
|---|---|
| Frequency | Annually |
| Typical cost | £100–£180 |
| Outdoor unit | Coil/fins cleaned, fan, defrost, drainage, clearances |
| Refrigerant circuit | Pressures/temperatures checked (F-gas competence) |
| System side | Water quality, inhibitor, filter, pressure, cylinder |
| Settings | Flow temperatures and controls reviewed against design |
Knowing the emergency number before you need it
Save it now: the National Gas Emergency Service on 0800 111 999, free and answered 24 hours. The decision to call should never involve looking anything up — if you smell gas, everyone leaves the property, no electrical switches are touched, and the call is made from outside. Knowing that sequence cold is worth more than any amount of reading in the moment it matters.
Frequently asked questions
Do heat pumps need annual servicing?
Yes — for warranty compliance, efficiency and longevity. The work differs from a boiler service (no combustion checks, refrigerant and airflow instead) but the annual rhythm and the record-keeping are the same.
How much does heat pump servicing cost?
Typically £100–£180 a year, broadly comparable to boiler servicing. Manufacturer warranties generally require it documented, so treat it as part of the ownership cost from day one.
Can any engineer service a heat pump?
Work on sealed refrigerant circuits requires F-gas competence, and manufacturer-specific familiarity helps considerably. Our network routes servicing to appropriately qualified engineers — ask about credentials as you would a Gas Safe card.
What can I do myself between services?
Keep the outdoor unit clear of leaves, snow and vegetation, maintain clearance around it, glance at system pressure occasionally, and leave the flow temperature settings alone — overriding them upward is the commonest self-inflicted efficiency loss.
Where written advice reaches its limit
Guidance like this can tell you what usually causes a symptom, but only an engineer with instruments on your actual appliance can confirm it. If what you're seeing doesn't quite match any pattern described here — or matches several at once — that ambiguity is itself useful information to hand over. Our engineers do this triage daily, and an honest one will tell you on the phone when your problem sounds like a cheap fix, a bigger job, or something that isn't the boiler's fault at all.
Every home with a boiler, fire or heater needs a working alarm: carbon monoxide symptoms, alarm placement and what to do if you suspect it.