526 Fleet Ln

St Helens, WA9 2NB

Mon-Fri 08.00-17:00

Sat and Sun CLOSED

Mon-Fri 08.00-17:00

Sat and Sun CLOSED

526 Fleet Ln

St Helens, WA9 2NB

Boilers

Combination (Combi) Boilers

What are they?

  • Combi boilers provide heating and hot water from one unit, typically wall hung.
  • The most popular type of boiler in the UK.
  • Heat exchanger instantly heats on-demand via combustion (of gas or oil).

Pros?

  • Highly energy efficient. 
  • Compact in size, so they don’t require much space within the home.
  • Hot water on demand.

Con’s?

  • Water flow is reduced when there are two or more outlets in use.
  • If the mains water pressure is low, the boiler should not be fitted
  • Larger properties with multiple bathrooms cause problems for combis.
Combination (Combi) boilers​

Heat Only (Regular) Boilers

What are they?

  • Provide both heat and hot water with the use of an additional hot water cylinder and cold water tank
  • Pumps and valves are external from the boiler (usually found in airing cupboards due to open pipework)
  • Gravity-fed cold water directly into the boiler from the tank, usually in the attic/loft.

Pros?

  • Greater flow rate so works better in bigger properties with more bathrooms.
  • Suitable for older heating systems as they do not require high pressure from the mains.
  • Due to the simplicity of their parts, they are considered more reliable than combi boilers.

Con’s?

  • Potential to drag air into the system due to the open vents, potentially causing corrosion.
  • The hot water cylinder may take a while to heat up, so hot water isn’t instantly available from cold.
  • Requires more space than a combi boiler as it needs a cylinder and tank.

System Boilers

What are they?

  • Similar to heat only in that hot water is supplied from a cylinder (typically unvented).
  • Pumps are within the boiler, and the system is pressurised.
  • Water is supplied to the boiler via the mains.

Pros?

  • There is a greater flow rate than a regular boiler, so it works better in bigger properties with more bathrooms.
  • Less chance for air to be dragged into the system. 
  • More flexibility in install location due to the pump being internal.

Con’s?

  • They are unable to be fitted in low-pressure mains water areas.
  • Properties with older heating systems may not be ideal due to higher pressure.
  • Requires more space than a combi boiler as it needs a cylinder.