When choosing a Boiler you need to consider:

  • The size
  • The type
  • The construction
  • Energy efficiency
  • The impact it will have on your home and your energy bills
Type of BoilerAboutAdvantagesThings to Consider
Combi BoilerThe UK’s most popular type of boiler. It supplies hot water for your taps and central heating system directly from the boiler unit.
Ideal for smaller homes and homes with one bathroom.
Limitless hot water on demand.
Economical only heats the water you use.
Saves space as no need for a separate cold water tank or hot water cylinder.
Fast installation may be quicker due to fewer parts
The flow of hot water could be reduced if you’re using more than one tap at the same time (depending on your mains water pressure)

You may have to wait a few seconds for the water to heat up.
Conventional BoilerAlso known as regular or heat-only boilers, they send heated water to your radiators and a hot water cylinder.
Good for larger homes, especially those with more than one bathroom.
Can provide hot water to more than one tap at the same time.

Should your boiler breakdown, an electrical immersion heater can be fitted to the hot water cylinder as a back-up.
A larger space is required for a hot water cylinder and a cold water tank which is usually located in the loft.

Because the hot water is limited to the capacity of the cylinder, if it runs out you’ll need to wait until it heats up again.
System BoilersThese work in a similar way to conventional boilers but have some external parts built-in.
There’s no need for a separate feed and expansion tank usually located in the loft.
Suit for larger homes and homeowners who want extra storage space in their loft.
Hot water can be supplied to more than one tap at the same time.
Should your boiler breakdown, an electrical immersion heater can be fitted to the hot water cylinder as a back-up.
To ensure hot water is available for when you need it, you’ll require programmable controls to heat your water in advance.
If you choose a mains-fed hot water cylinder, you won’t require a cold water tank in the loft.