Free, no-obligation comparison
Compare new boiler quotes from UK heating businesses and understand what is included before committing. A fair comparison covers the boiler, controls, system work, warranties and compliance—not just the appliance price.
Request and compare quotesTypical UK costs
Energy Saving Trust gives an average of about £3,500 for replacing a G-rated gas boiler with an A-rated boiler and thermostatic radiator valves in Great Britain. A simple like-for-like swap can cost less; conversions, cylinders, long flues and upgrades can cost more.
Prices are indicative, not a quotation. A survey and written scope are needed for an accurate price.
Options to compare
- Combi boilers
- System boilers with a hot-water cylinder
- Regular or heat-only boilers
- Like-for-like replacement or system conversion
What affects the price?
- Boiler type, output and manufacturer
- Relocation, flue and condensate route
- Cylinder, pumps, valves or radiator upgrades
- System cleaning requirements
- Controls, filters, access and disposal
What should be included in the quote?
- Boiler model, output and warranty registration
- Flue, filter, controls and condensate work
- System clean, inhibitor and commissioning
- Building Regulations notification and documents
- Old-boiler removal, VAT and payment schedule
Installer checks
Gas and LPG boiler work must be carried out by a Gas Safe registered engineer. Verify the engineer and registered work categories on the Gas Safe Register. For oil, check OFTEC registration where relevant.
Timelines and warranties
A straightforward replacement often takes one day; relocation or conversion may take two to four days. Manufacturer warranties commonly depend on commissioning, registration and servicing, so confirm every condition.
How Get Free Quote works
- Tell us about the project. Share property and service details needed to understand the enquiry.
- Review suitable options. We research relevant providers and help organise comparable information.
- Compare written quotations. Check price, scope, credentials, exclusions, timescale and warranty.
- Choose whether to proceed. There is no obligation to accept a quote.
Personal information may be shared with relevant providers as described in our Privacy Policy.
Useful guidance
Considering lower-carbon heating? Read our air source heat pump guide.
Frequently asked questions
Which boiler size do I need?
Output should be calculated from the property, hot-water demand and system design. More kilowatts is not automatically better.
Should a quote include system cleaning?
It should state the cleaning method, inhibitor and filter. Ask why a powerflush is or is not recommended.
Is the longest warranty best?
Not always. Compare exclusions, servicing requirements, parts availability and support.