Boiler Buying Guide
Everything you need to know before buying a new boiler
Types of Boilers
There are three main types of boiler. The right one for you depends on your property size and hot water needs.
Combi Boiler
Heats water on demand without a tank. Most popular choice in the UK.
✓ Pros
- • No hot water tank needed
- • Compact size
- • Instant hot water
- • Energy efficient
✗ Cons
- • Flow rate may drop with multiple taps
- • Not ideal for homes with many bathrooms
Best for: Smaller homes with 1-2 bathrooms
System Boiler
Works with a hot water cylinder to store heated water for later use.
✓ Pros
- • Constant hot water pressure
- • Better for multiple bathrooms
- • Compatible with solar thermal
✗ Cons
- • Requires a hot water cylinder
- • Takes up more space
Best for: Larger homes with 2+ bathrooms
Conventional Boiler
Traditional system with cold water tank and hot water cylinder.
✓ Pros
- • Ideal for high hot water demand
- • Works with older heating systems
- • Good water pressure
✗ Cons
- • Requires most space
- • Less energy efficient
Best for: Large homes or older properties
What Size Boiler Do I Need?
The right boiler size depends on your property and hot water demand.
| Bedrooms | Bathrooms | Output (kW) | Recommended Type |
|---|---|---|---|
| 1-2 | 1 | 24-27 | Combi |
| 2-3 | 1-2 | 28-32 | Combi |
| 3-4 | 2 | 32-35 | Combi or System |
| 4+ | 2+ | 35+ | System |
How Much Does a New Boiler Cost?
A fully installed boiler typically costs between £1,800 and £3,500.
Budget
£1,800 - £2,200
5-7 year warranty
Mid-Range
£2,200 - £2,800
8-10 year warranty
Premium
£2,800 - £3,500
10-12 year warranty