Expect 5–7 years on a heat pump as standard, extending to 10 years on parts and compressor when the unit is registered and serviced annually. Solar thermal collectors should carry 10 years and cylinders 5–10. The decisive detail is labour: most manufacturer warranties replace the part but not the engineer's time.
What warranty lengths are normal in 2026?
Warranty is not one number. Every system contains four separate promises — equipment, labour, workmanship and performance — and they expire at different times.
| Component | Typical manufacturer cover | Usual condition |
|---|---|---|
| Heat pump, parts and compressor | 5 – 7 years standard, 7 – 10 with registration | Registration within 60–90 days, annual service |
| Heat pump labour | 1 – 2 years from the installer | Extended plans typically €200–600 per year |
| Flat plate or evacuated tube collector | 10 years | Correct glycol maintenance, no repeated stagnation |
| Enamelled steel cylinder | 5 – 10 years | Documented anode inspection |
| Stainless steel cylinder | 10 – 25 years | Water quality limits, correct earthing |
| Pumps, controllers, expansion vessels | 2 – 5 years | Correct system pressure |
| Installer workmanship | 1 – 2 years, longer under consumer codes | Certified installation |
If a supplier advertises a single headline figure without saying which of those seven rows it applies to, that is the first question to ask.
Where do warranties actually fail?
On labour, almost always. A manufacturer warranty is a promise about a component, not about a visit. If a compressor fails in year six under a ten-year parts warranty, the part arrives free and the invoice for recovering refrigerant, fitting and recommissioning is yours. In practice that is the largest single line in most out-of-warranty repairs, which is why extended plans that include labour are priced separately.
The second failure point is the chain of responsibility. The manufacturer covers the box, the installer covers the pipework, and a leaking joint on a badly supported flow pipe belongs to neither if the installer has closed. Ask whether the workmanship guarantee is insurance-backed — that is the only version that survives an insolvency.
What quietly voids the cover?
- A missed annual service. Most extended cover on heat pumps is conditional on documented servicing. See do heat pumps need annual servicing?
- Neglected glycol. Heat transfer fluid degrades with heat cycling and turns acidic; unreplaced fluid is a standard exclusion on collector warranties. See how often should solar glycol be replaced?
- Uninspected anodes. An enamelled cylinder's warranty depends on a working magnesium anode; the inspection interval is a warranty condition, not advice.
- Repeated stagnation. Collectors are designed to survive stagnation, but a system that stagnates every summer because it is oversized will show it in the fluid and the seals.
- Water quality. Fill-water hardness and chloride limits appear in almost every cylinder warranty and are almost never read.
- Non-certified installation or late registration. Both are avoidable and both are absolute.
What backs the promise besides the paperwork?
Certification, because it is checked by someone other than the seller. A Solar Keymark certificate is valid for five years with annual surveillance of the factory, so it tells you the product is still being made the way it was tested — something no warranty document can. Heat Pump Keymark performs the same role for heat pumps against EN 14511, EN 14825 and EN 16147, and its data feeds national subsidy eligibility lists. On the tank side, EN 12897 covers unvented indirect storage water heaters up to 2,000 litres including the standing-loss test, and DIN 4753 governs enamelling and water-side corrosion protection.
Manufacturing continuity matters as much as the certificate. Solimpeks has been producing collectors in Konya since 2001, and a quarter-century of continuous production is evidence that cannot be written by a marketing department.
What should you check before signing?
Ask for the warranty documents, not the brochure claim, and confirm five things: the length for each of the seven rows above; whether labour is included and for how long; the registration deadline and who does it; the servicing requirement and what evidence is accepted; and whether the workmanship guarantee is insurance-backed. Then file the commissioning record with them — in most disputes the argument is not about the warranty text but about whether the system was commissioned correctly in the first place.
Frequently asked questions
How long should a heat pump warranty be?
Five to seven years on parts and compressor is the market standard in 2026, rising to seven or ten years where the unit is registered promptly and serviced annually. Anything under five years is below par for a European domestic heat pump.
Do solar thermal collectors come with a 10-year warranty?
Reputable flat plate and evacuated tube collectors typically carry ten years, reflecting expected service lives well beyond twenty. Cover is conditional on correct glycol maintenance and on the system not stagnating repeatedly through oversizing.
Does an extended warranty on a heat pump make sense?
It does when it includes labour, because labour is what manufacturer cover excludes. Plans typically run €200–600 per year. Compare that against the realistic cost of one compressor replacement, which is where the value sits.
Is a warranty valid if I install the system myself?
Generally no. Manufacturer warranties on heat pumps and pressurised cylinders require certified installation and commissioning, and every national grant scheme requires it too. Self-installation typically voids the warranty and the subsidy together.