The short version
- Ask for the service history and Building Regulations certificate
- Check the radiator condition, not just the appliance
- A boiler that's been unused for months needs testing before you rely on it
- Plan a replacement in warm weather rather than mid-winter
What to ask the seller
Paperwork is the cheapest form of due diligence.
- Installation date and the Building Regulations notification
- Service records for the last few years
- Whether the boiler is still under manufacturer warranty
- Any known faults, leaks or radiators that don't heat
- Whether a system filter is fitted
What we check on a first inspection
Combustion performance, gas soundness, system pressure behaviour, water quality, radiator temperature spread and the condition of controls. That gives you a realistic view of whether you've inherited five more years or one.
Planning rather than reacting
If the verdict is 'sound for now', a service and a filter is the sensible spend. If it's 'nearing the end', budget for a replacement and book it for spring or summer when appointments are easier and you're not choosing under pressure.
Common questions
Should I get the boiler checked before completing?+
If access is possible, yes — a specialist inspection is far cheaper than a surprise replacement.
The boiler has been off for months — is that a problem?+
It can be. Seals, pumps and valves can seize. It should be tested rather than just switched on.
Can you service and inspect in one visit?+
Yes, a service with a condition report covers both.
Is no service history a red flag?+
It's a warranty problem and often a system condition problem too. We'd test water quality carefully.
Just moved in?
Book a service and condition report so you know what you've got.