Annual servicing is not legally required for a typical domestic heat pump in Europe — hermetically sealed units holding under 10 tonnes CO₂-equivalent of refrigerant are exempt from mandatory leak checks — but almost every manufacturer makes an annual check a warranty condition. The realistic split is a 20-minute owner check each quarter and a professional service every one to two years.
Is an annual heat pump service legally required?
Usually not, and the confusion comes from mixing up refrigerant law with warranty terms. Under the EU F-Gas Regulation (2024/573), equipment holding 5 tonnes CO₂-equivalent or more must be leak-checked by a certified technician — but hermetically sealed equipment labelled as such is exempt below 10 tonnes CO₂-equivalent, and below 3 kg of refrigerant in residential buildings. Nearly every domestic monoblock falls inside those exemptions. A unit running on R290 propane contains no fluorinated gas at all and sits outside the leak-check regime completely, although the updated F-gas certification programmes, which Member States had to adapt by 29 September 2025 under Implementing Regulation (EU) 2024/2215, now cover natural refrigerants.
What is binding is the warranty. Most manufacturers require documented annual maintenance to keep a compressor warranty alive, and that contractual requirement — not the law — is why annual service plans exist.
What does a heat pump service actually include?
| Task | Frequency | Who |
|---|---|---|
| Clear leaves, snow and vegetation; keep clearances free | Quarterly | Owner |
| Check the condensate drain runs and is not icing | Monthly in winter | Owner |
| Check system pressure (typically 1 – 1.5 bar cold) | Quarterly | Owner |
| Read electricity and heat meters; watch the SPF trend | Monthly | Owner |
| Clean the magnetic dirt separator and strainer | Annual | Owner or engineer |
| Check inhibitor concentration and water quality | Every 1 – 2 years | Engineer |
| Check refrigerant pressures, superheat and subcooling | Every 1 – 2 years | Certified engineer |
| Check expansion vessel pre-charge | Every 2 years | Engineer |
| Inspect the DHW cylinder's magnesium anode | Every 2 years | Engineer |
| Review weather curve, cycling and flow rate against data | Annual | Engineer |
The last line is the one that pays for the visit. On a sealed circuit there is rarely anything to find in the refrigerant, but a review of flow temperature, compressor starts and hot water scheduling regularly recovers 10–20% of running cost on systems that were commissioned in a hurry.
What can I do myself?
Most of the value, honestly. Keep 300 mm clear around the outdoor unit and never box it in; sweep snow off the coil and confirm the condensate drain has not frozen into a sheet; check the pressure gauge; and log meter readings monthly so a rising consumption trend shows up before the bill does. Never open the refrigerant circuit, and never top up a system that keeps losing pressure without finding the leak first — falling pressure is a fault report, not a maintenance task. Related routines for a combined system are listed in the solar thermal maintenance checklist.
Is a paid annual service worth the money?
It depends what you are buying. A "safety inspection" modelled on a gas boiler service adds little to a sealed heat pump. A performance service — where the engineer downloads run data, checks starts per hour, verifies the temperature difference across the condenser, tunes the compensation curve and inspects the cylinder anode — routinely pays for itself. When comparing service contracts, ask which of the two you are getting.
Skipping maintenance shortens life in predictable ways: a fouled evaporator forces longer defrosts, untreated water sludges the condenser, and an exhausted magnesium anode quietly ends the cylinder years early. See how long does a heat pump last? and how often should the magnesium anode be replaced?
Frequently asked questions
Is it a legal requirement to service a heat pump every year?
For a typical domestic unit in the EU, no. Hermetically sealed equipment below 10 tonnes CO₂-equivalent, or below 3 kg of refrigerant in a residential building, is exempt from mandatory leak checks. Manufacturer warranty terms, not legislation, are what usually require annual servicing.
How much of a heat pump service can I do myself?
Everything except the refrigerant circuit and the water treatment check. Keeping the evaporator clear, confirming the condensate drain runs, watching system pressure and logging meter readings covers most of the practical risk.
Do R290 propane heat pumps need different servicing?
They fall outside the F-Gas leak-check regime because propane is not a fluorinated gas, but they require a technician trained and certified for flammable refrigerants. Under Implementing Regulation (EU) 2024/2215, national F-gas certification programmes updated by 29 September 2025 cover natural refrigerants.
What happens if I never service my heat pump?
It will keep running, and it will quietly get more expensive. A fouled evaporator lengthens defrosts, untreated water sludges the heat exchanger, and an exhausted cylinder anode ends the tank's life early — while an unserviced unit may also void the compressor warranty.