Answer four quick questions and get a tailored recommendation. Takes under 30 seconds.
How old is your boiler?
What brand is it?
How many breakdowns in the last 12 months?
When was it last serviced?
What's the current problem? (select all that apply)
Already been quoted for a repair? (optional)
How many bedrooms does your property have?
It depends on the age, repair history, and cost of the fix. A common rule of thumb is that if the repair costs more than half the price of a new boiler, replacement usually makes more sense. Boilers over 12 years old with recurring faults are rarely worth investing in further. A newer boiler with a one-off fault is almost always worth repairing.
Most boilers last 10 to 15 years with annual servicing. Without regular maintenance, that can drop to 8 to 10 years. Beyond 15 years, parts become harder to source and efficiency drops significantly - a modern A-rated condensing boiler can cut heating bills compared to an older non-condensing unit.
Key signs include frequent breakdowns, rising energy bills despite normal usage, uneven heating, the boiler taking longer to heat up, visible corrosion or leaks, and error codes appearing repeatedly. If your boiler is pre-2005 and non-condensing, it is also worth replacing on efficiency grounds alone.
Supply and fit for a standard combi boiler replacement in London typically runs £1,800 to £3,200 depending on property size, boiler brand, and whether additional work is needed such as pipework or flue changes. Larger properties or system boilers will be at the higher end. Renzy provides fixed quotes for installations with no hidden costs.
Most boiler repairs in the UK fall between £150 and £600. Common jobs such as replacing a diverter valve, pressure relief valve, or printed circuit board sit in the £200 to £400 range. Emergency call-outs or parts for older boilers can push costs higher. If a repair quote exceeds £500 to £600 and the boiler is over 10 years old, replacement is often the better investment.
This tool uses artificial intelligence to generate a general recommendation based on the information you provide. It is not a professional assessment and does not constitute advice from a qualified engineer. Results may be inaccurate, incomplete, or not applicable to your specific situation.
Always consult a Gas Safe registered engineer before carrying out or authorising any gas or boiler work. It is illegal for anyone who is not Gas Safe registered to work on gas appliances in the UK.
This tool is intended for use in the United Kingdom only. Cost estimates are based on typical London and South East rates and may differ significantly in other regions or for non-standard installations.
Renzy accepts no liability for decisions made based on the output of this tool. If you are experiencing a gas emergency, do not use this tool - call the National Gas Emergency Service on 0800 111 999 immediately.