Heating systems and selling your home
Buyers' solicitors commonly ask for the boiler's age, service history and any installation certificates. A boiler without a Benchmark certificate or with no service history can raise questions during a sale — keeping this paperwork together makes the process smoother.
Heating in older and period properties
Older properties often have narrower pipework, no cavity wall insulation, and sometimes a heating system not originally designed for full central heating throughout — all of which affect boiler sizing and radiator choice. A heating engineer working on a period property will usually assess the whole system, not just swap the boiler in isolation.
Combi vs system vs conventional boilers
A combi heats water on demand with no tank or cylinder, suits smaller properties with one bathroom. A system boiler uses a hot water cylinder but no cold water tank, better where several taps might run at once. A conventional (regular) boiler uses both a tank and cylinder, common in older or larger properties, or where mains pressure is poor.
Shared heating systems in flats and conversions
Some converted properties share a communal boiler or heating system rather than each flat having its own — check which applies before booking, since a fault or upgrade on a shared system usually needs freeholder or management company involvement, not just your own arrangement.
Three steps to hiring the right heating engineer
First, confirm Gas Safe registration and ask to see the ID card, which lists exactly what gas work they're qualified for. Second, get a written quote naming the boiler model. Third, ask what the manufacturer's warranty requires (usually an annual service) to keep it valid.
How long should a boiler last, and when to replace vs repair
Most boilers last 10-15 years with regular servicing. As a rough guide, if a repair would cost more than a third of a new boiler's price, or the boiler is over 10-12 years old and parts are getting harder to source, replacement is usually the better long-term value than another repair.
Why Gas Safe registration is a legal requirement
Anyone installing, servicing or repairing a gas appliance or gas pipework in the UK must by law be on the Gas Safe Register, which replaced CORGI in 2009. This covers boilers, gas fires and gas cookers. Using an unregistered engineer for gas work isn't just risky, it's illegal, and any resulting certificate isn't valid.
Oil-fired boilers, what's different
Oil boilers are common in properties off the mains gas network, need an oil storage tank with its own maintenance and safety considerations, and are serviced by OFTEC-registered engineers rather than Gas Safe (which only covers gas). If you're off-grid, confirm your engineer's OFTEC registration specifically.