Whole house boiler sizing

Use this sizing wizard to get the replacement boiler for your house that runs most efficiently, has lower running costs and produces lower carbon emissions. This method should be used for gas, oil and LPG boilers up to 25Kw.

Assess the dwelling shape

Rectangular dwelling use calculator alone	Extensions and loft conversions use calculator and add on radiator sizes in section 7	Non-rectangular dwellings divide into sections and repeat calculations

Section 1 of 7: Take the internal measurements (in metres) of the overall dwelling.

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* Denotes a mandatory field

Length:	*
Width:	*
Room height:	*
Number of floors:	*

Continue to Section 2