Frozen condensate pipes in winter
A frozen condensate pipe (the small plastic pipe draining from a condensing boiler, often outside) is one of the most common winter boiler breakdowns — it causes the boiler to shut down as a safety measure. Pouring warm (not boiling) water over the pipe to thaw it, if safely accessible, sometimes fixes this without a call-out.
Common heating engineer jobs
Heating engineers install, service and repair boilers and central heating systems: annual boiler services, fault diagnosis, radiator installation and balancing, powerflushing, and full system replacements. Many also work on unvented hot water cylinders and, increasingly, heat pumps and other low-carbon heating.
Gas fires and stoves — same Gas Safe rule applies
Installing or servicing a gas fire, gas stove, or gas oven/hob is gas work under the same legal framework as a boiler — it must be done by a Gas Safe registered engineer qualified in that specific appliance category, not just any gas-qualified engineer, since categories are appliance-specific.
What affects the cost
Cost depends on the type of system (combi vs system vs conventional), whether it's a straightforward swap or a full system change, boiler brand and output size, and property access. Moving a boiler's location, rather than replacing it in place, adds cost because of the extra pipework, flue routing and making good involved.
Gas safety duties for landlords
Landlords must have a valid Gas Safety Certificate (CP12) renewed every 12 months for any gas appliance in a rented property, and provide a copy to tenants. It's a legal requirement, and letting agents/insurers routinely check for it — failing to have one can invalidate insurance and result in prosecution.
When to replace vs keep existing radiators
Radiators themselves rarely need replacing unless damaged, corroded, or you're changing the property's heat demand (e.g. adding a heat pump, which often needs larger radiators to run at a lower temperature). A power flush can often extend a radiator's working life significantly cheaper than replacement.
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.
Air source heat pumps, what to know
A heat pump extracts heat from outside air even in cold weather, and typically runs at a lower flow temperature than a gas boiler, which usually means larger radiators or underfloor heating for the same comfort level. Installation is a bigger job than a boiler swap and government grant schemes (like the Boiler Upgrade Scheme) can offset some of the cost.