Planning to replace your boiler in Tunbridge Wells or the wider Kent area? Understanding the costs involved helps you budget properly and avoid surprises. Here's a realistic breakdown of what new boilers actually cost in 2026, with no marketing fluff.
Typical price ranges for 2026
- Combi boiler (like-for-like swap): £2,200 to £3,500 fitted
- System boiler with hot water cylinder: £2,800 to £4,500 fitted
- Conventional / regular boiler: £2,500 to £4,000 fitted
- Full system conversion (combi from regular): £3,500 to £5,500 fitted
- Electric boiler installation: £1,800 to £3,200 fitted
These are real numbers based on jobs I've quoted across Tunbridge Wells, Tonbridge, and Sevenoaks in the last 12 months. Watch for online calculators that come in much lower: they usually exclude the labour, the flue kit, the system flush, or the controls.
What drives the price?
Three things move the number the most: the brand and output of the boiler, whether you're changing the boiler type or location, and whether the system needs a flush before the new boiler goes in.
- Worcester Bosch and Vaillant typically cost £150 to £400 more than Ideal or Baxi for similar specs
- Moving the boiler to a new location adds £400 to £900 in pipework
- A power flush adds £350 to £550 but extends warranty validity on most brands
- Magnetic system filter (highly recommended): £150 to £200 fitted
- Wireless room thermostat or smart controls: £150 to £400 depending on model
A 10-year manufacturer warranty (standard on most Worcester Bosch and Vaillant installs by accredited engineers) is worth more than a £100 discount up front. Repair bills outside warranty start at £200 and climb fast.
How to get a fair quote
Always insist on a free home survey before any quote. Phone estimates are guesses, and the cheaper they sound the more likely they are to balloon. I quote in writing, fixed-price, after a 20-minute survey at your property. No call-out fee, no obligation.