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Combi boiler installation

Combi Boilers

Combi (combination) boilers are the most popular choice for UK homes. They provide both central heating and hot water on demand, without the need for a separate water tank or cylinder. This makes them incredibly compact and efficient.

Perfect for homes with 1-2 bathrooms where hot water demand is moderate. Modern combi boilers achieve efficiency ratings of up to 93%, significantly reducing your energy bills compared to older systems.

Key Features

  • Compact wall-mounted design, no tanks required
  • Instant hot water on demand
  • High efficiency up to 93%
  • Available in outputs from 24kW to 40kW
  • Ideal for flats and smaller homes

System Boilers

System boilers are ideal for homes with multiple bathrooms that need a constant supply of hot water at high pressure. They work alongside a separate hot water cylinder to store water, ensuring everyone in your household can use hot water simultaneously without pressure drops.

These boilers are perfect for medium to larger properties and offer the reliability of a traditional system with the efficiency of a modern design. Many models can be combined with smart controls for enhanced comfort and energy savings.

Key Features

  • Consistent hot water pressure for multiple outlets
  • Suitable for homes with 2+ bathrooms
  • No cold water tank needed (requires hot water cylinder)
  • Outputs available from 15kW to 40kW
  • Energy efficient with smart control compatibility
Central heating system
Heat only boiler system

Heat Only Boilers

Heat only boilers (also known as regular or conventional boilers) are the traditional choice, working with separate cold water and hot water cylinders. They are ideal for homes that already have this system in place or require very high hot water demands.

If your property already has a conventional heating system with tanks in the loft, a heat only boiler can often be installed as a direct replacement without requiring significant changes to your pipework.

Key Features

  • Works with existing tank systems
  • High output options for larger homes
  • Cost-effective solution for the right property
  • Outputs available up to 40kW
  • Reliable performance for high-demand homes
Boiler Sizing

Choosing the Right Output

The size (output) of your boiler depends on your home's size, number of radiators, and hot water requirements.

Boiler Output Suitable For Radiators
24kW Small homes, 1-2 bedrooms, 1 bathroom Up to 10 radiators
30kW Medium homes, 3-4 bedrooms, 1-2 bathrooms Up to 15 radiators
35kW Larger homes, 4+ bedrooms, 2+ bathrooms Up to 20 radiators
40kW Large homes, multiple bathrooms, high demand 20+ radiators

Not sure which boiler is right for your home? Our experts will assess your property and recommend the perfect boiler during a free home survey.

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