What size of boiler do I need?

The size of boiler you will need will depend on the heat loss from your house. If you have made improvements to your house, such as double glazing, cavity wall insulation, draught proofing and loft insulation, the size of boiler you now need may be smaller than the one it is replacing. An estimate of heat loss must be carried out by your installer before a new boiler is selected.

It is important that the correct sized boiler is selected for your home. A boiler that is too small will not have sufficient output to meet the heating demand of your property and a boiler which is too big will not be as efficient compared to a boiler with the appropriate heating output.

Your installing engineer will be able to advise on what size boiler is needed for your home – find local G1 oil boiler installers here.

The range of oil-fired boilers supplied by Grant UK include internal and external boilers ranging in heating output from 15kW up to 70kW. This means there is a Grant Vortex Oil Boiler that could suit your home, such as:

Vortex Pro Internal white cased boilers available in three heating output sizes to suit smaller homes, larger properties and those with higher heating demand. Vortex Eco Internal models also available.

Vortex Pro External boilers designed for outdoor installation when space inside the home is limited, including heat only models. Vortex Eco External models also available.

Vortex Pro Internal combis and External combi boilers providing a combination oil boiler solution in heating outputs from 21kW up to 36kW. Also includes the slimline combi internal boiler which is just 515mm wide.

Vortex Wall Hung boiler models ranging in heating output from 16kW up to 21kW with internal white cased wall hung oil boilers and powder coated external wall hung boiler models available, ideal for homes where floor space is limited.

Vortex Boiler House red powder coated oil-fired boilers which are designed for installations where a white-cased utility boiler is not suitable. The Vortex Boiler House boilers are available in heating outputs from 15kW up to 70kW so can suit smaller and larger homes.