Cost GuidesUpdated May 2026By TradeMatch Editorial Team·28 March 2026·Updated 12 April 2026·8 min read

How Much Does a New Boiler Cost in 2026?

Replacing a boiler is one of the most common — and most expensive — home maintenance tasks UK homeowners face. Whether your current boiler has broken down or you want a more energy-efficient model, understanding the costs involved is essential for budgeting.

Professional tradesperson completing quality work

Average Boiler Replacement Costs in 2026

The cost of a new boiler in 2026 ranges from £1,500 to £4,500 including installation, depending on the type of boiler, your property size and your location.

Boiler Type	Supply Cost	Installation	Total
Combi Boiler	£600–£1,500	£500–£1,000	£1,100–£2,500
System Boiler	£800–£2,000	£700–£1,500	£1,500–£3,500
Conventional Boiler	£700–£1,800	£800–£1,500	£1,500–£3,300
Back Boiler Replacement	£1,200–£2,500	£1,000–£2,000	£2,200–£4,500

What Affects the Price?

Location is the biggest factor — London prices are typically 20–40% higher than the national average. Other factors include:

- Boiler type and brand — Premium brands like Worcester Bosch and Vaillant cost more but offer longer warranties
- Property size — Larger homes need higher-output boilers
- Flue and pipework — Moving the boiler location or extending the flue adds cost
- System conversion — Switching from conventional to combi requires additional pipework
- Timing — Emergency replacements in winter cost more than planned installations

How to Save Money on a New Boiler

1. Get at least 3 quotes — Prices vary significantly between installers
2. Consider mid-range brands — Ideal and Baxi offer good reliability at lower prices
3. Book in summer — Gas engineers are less busy, so prices and availability are better
4. Check for grants — The Boiler Upgrade Scheme offers up to £7,500 towards heat pumps as an alternative
5. Choose a Gas Safe registered installer — This is a legal requirement and ensures the work is safe and insured

Frequently Asked Questions

How long does it take to install a new boiler?

A straightforward like-for-like boiler swap typically takes 1 day. If you are changing boiler type (e.g., conventional to combi) or relocating the boiler, it can take 2–3 days including pipework modifications.

How long should a boiler last?

A well-maintained boiler should last 10–15 years. If your boiler is over 10 years old and needing frequent repairs, replacing it is usually more cost-effective in the long run, especially with improved energy efficiency.

Do I need to replace my boiler if it breaks down?

Not necessarily. Minor repairs like replacing a thermocouple, fan or pump may cost £100–£400. However, if your boiler is over 12 years old, the cost of repeated repairs often exceeds the cost of replacement.