Commercial heat pump lifespan and servicing: what to plan for

What the published figures say

This guide does not set a lifespan for commercial heat pumps. Service life varies by make, duty and upkeep, and no single figure applies to every site. For orientation only, the Fuse Energy commercial heat pump cost guide (updated 8 July 2026) says the system’s lifespan “can be between 15 to 25 years”. That is one installer-published statement, not a standard and not a promise about any unit you might buy. Ask any manufacturer what design life and warranty period they actually stand behind, and get it in writing.

The same guide says annual servicing is typically recommended, with costs starting from around £250 excluding VAT for commercial systems, depending on size, configuration and complexity. Read that as a floor for a small system under a basic visit, not a typical price: larger cascades, ground loops and sites with building management system integration will quote differently. The honest approach is to ask for the service scope first and the price second.

What governs how long a heat pump lasts

Nobody can read a lifespan off a brochure. These are the engineering factors that move it.

• Duty cycle. A unit that runs steadily at part load ages differently from one that short-cycles on and off. An oversized machine starts and stops far more often, which stresses the compressor. The sizing guide explains why cascades of modular units help.
• Water quality. Dirt, sludge and scale in an old heating circuit can block heat exchangers and strainers and reduce flow. Cleaning, flushing and filtration at installation, and checking inhibitor and water condition afterwards, protect the plant.
• The refrigerant circuit. A sealed circuit that stays tight keeps its charge. Slow leaks reduce capacity and efficiency and can damage the compressor if ignored.
• Defrost cycling. Air-source units periodically defrost their outdoor coil in cold, damp weather. Frequent or failed defrosts, often caused by blocked airflow, poor siting or faulty sensors, increase wear and cut output.
• Controls. Poorly set weather compensation, sequencing or setpoints can make a sound machine work harder than it should. Many “failures” are control faults.
• Environment. Coastal salt air and industrial or agricultural pollutants can corrode coils and casings. Ask about coil coatings and the manufacturer’s corrosion warranty if the site is exposed.

Siting and clearances, covered in the air-source heat pump guide, also affect airflow and therefore defrost behaviour.

What a commercial service contract should cover

Ask each installer or maintenance provider to list the scope of a visit rather than quote a generic “annual service”. A sensible checklist includes:

• Refrigerant leak checks. UK F-Gas regulations place duties on equipment operators, and the requirements depend on the refrigerant and the amount of charge. Under the UK F-gas rules, equipment holding 5 tonnes CO2e or more of F-gas (10 tonnes if hermetically sealed) needs leak checks by certified personnel at least every 12 months, rising to every 6 and 3 months from 50 and 500 tonnes CO2e, and a fitted leak-detection system doubles the interval. R290 is not an F-gas, so these checks do not apply to it. Check the current gov.uk F-gas guidance, and ask the contractor to state which obligations apply to your equipment and who keeps the records. Only suitably qualified people may handle refrigerant.
• Water side. Strainers and filters, flow rates, pressures, expansion vessel, inhibitor or water condition, and any buffer or cylinder.
• Air side or ground loop. Coil cleanliness, fan condition and condensate drainage for air-source units; fluid level, pressure and flow for ground-source loops.
• Electrical and safety checks. Terminations, contactors, isolators, protective devices and any soft-start or inverter drive settings.
• Controls and settings. Weather compensation curve, sequencing in a cascade, schedules, setback and any BMS points, with a record of changes.
• Performance review. A check of measured efficiency against what was expected (see below) and a written report of faults, advisories and parts.

Also ask about call-out terms, parts availability, remote monitoring and who is accountable if the unit and the controls come from different suppliers. This site does not set response times or offer service itself; compare written terms from the contractors you contact.

Track SCOP with heat and electricity metering

Seasonal coefficient of performance (SCOP) is the heat delivered divided by the electricity used over a season. The only way to know your real figure is to measure both. Ask for a heat meter on the heat pump’s output and a separate electricity meter or sub-meter on its supply, including pumps and auxiliary heaters if you want a whole-system number.

Compare the measured figure with the rated seasonal figure on the datasheet, remembering that rated values to BS EN 14825 use standard conditions and your flow temperature, weather and controls will differ. A slow decline over several seasons can point to fouled heat exchangers, falling refrigerant charge, an unseen defrost problem or drifting controls, which makes metering a cheap early-warning tool. Feed the figures into the running-cost break-even guide or the calculator to see what a change in SCOP does to your bills.

Warranty questions to ask before you sign

• How long is the warranty on the compressor, the heat exchangers and the controls, and is each covered for parts, labour or both?
• Does the warranty depend on a named servicing regime or on using the manufacturer’s approved service providers?
• What voids it: water quality, missed service visits, third-party control changes?
• Is there a corrosion warranty for coils if the site is coastal or industrial?
• Who holds the warranty if the installer stops trading, and is it backed by the manufacturer?
• If the installation is covered by the Boiler Upgrade Scheme (heat pumps up to 45 kWth for a single unit or up to 70 kWth for a multi-unit system, see the GOV.UK scheme page), what are the MCS-related handover documents and guarantees?

Check any installer’s credentials on public registers such as mcscertified.com before you sign. For hybrid arrangements, where a boiler stays in service, ask how the two are covered separately, as set out in the hybrid retrofit guide.