New or replacement boilers are rarely sized correctly. Oversized boilers cost more to buy and generally operate less efficiently resulting in higher running costs and increased emissions .
Boilers should be sized to suit the house they a re going to be heating.
The whole house sizing method is aimed at typical dwelling types found in the UK and Ireland as indicated by the U-values and other factors used. Where the dwelling is untypical, then a more detailed procedure should be used. The method should only be used for gas, oil and LPG boilers up to 25 kW and should not be used for combination boilers or solid fuel heating systems.
You can use this useful tool to work out the size of boiler you will probably need.
According to this - we will need one around 25 to 30KwH.
Boiler Calculator
Assumptions
a design internal temperature of 21°C (included in location factor).
an allowance of 10% for intermittent heating (included in the location factor).
an allowance of 5% for pipe losses (included in the location factor).
a ventilation rate of 0.7 air changes per hour (included in the 0.25 ventilation factor).
an allowance of 2 kW for heating hot water.
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