Every guide and calculator
Find help by what's wrong, not by fault code. If your boiler is showing a code, use the code finder instead.
Nothing matches that. Try fewer words, or look up a fault code.
Fix a problem
No hot water? Check these first
Checks for combis and tank systems, and when to call an engineer.
No heating? Work through these checks
Settings, thermostat, power, gas and pressure, in order.
Radiators cold in places
Cold at the top, the bottom, or one radiator: what each means.
Boiler keeps locking out or won't light
What to check before you reset, and how many resets to allow.
What's that noise from your boiler
Gurgling, kettling, banging or humming: what each noise means.
Boiler display blank
The power checks to do, including your fuse box.
Boiler leaking water
Where the water's coming from and what it means.
Boiler pressure too low, too high or dropping
What your gauge should read, by brand, and how to top up.
Cold weather
Frozen condensate pipe
How to thaw it safely, and which code each brand shows.
When to turn the heating on
What starting later saves, with this winter's figures.
Worcester Bosch: turn the heating on
Greenstar 2000, 4000, 8000, i and CDi, from the manuals.
Glow-worm: turn the heating on
Step by step for each model, from the user manual.
Vokera: turn the heating on
Step by step for each model, from the user manual.
Oil heating
Heating oil prices per litre
The latest survey averages, and a quote checker.
Oil tank rules: distances, base and bunding
Where a tank can go, and whether yours needs a bund.
Oil boiler locked out
How to reset Grant and Worcester Bosch oil boilers, and when to stop.
Leaking oil tank
What to do straight away, and who to call.
Calculators
Radiator size calculator
The BTU and watts a room needs, and what radiator to buy.
What size boiler do I need?
The kW manufacturers recommend for your home.
Pressure checker
Match your gauge to your brand's guidance.
Heating oil quote checker
Turn any quote into pence per litre.
Oil tank bund checker
Whether your tank needs a bund.