Why Boiler Size Matters
Boiler "size" doesn't refer to physical dimensions — it refers to the heat output, measured in kilowatts (kW). An undersized boiler will struggle to heat your home adequately, especially in cold weather. An oversized boiler cycles on and off too frequently, which reduces efficiency and increases wear.
Getting the right size boiler is one of the most important decisions in a new installation — and it should always be calculated properly, not guessed.
How Boiler Size Is Calculated
A proper boiler sizing calculation (heat loss calculation) takes into account:
General Guidelines (Combi Boilers)
These are rough guides — not a substitute for a proper heat loss survey:
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Why We Always Survey First
At Halo Heating, we never quote a boiler size without visiting the property first. We carry out a proper heat loss assessment to ensure the boiler we recommend is the right one — not just a common size. This is the professional standard, and it protects you from the problems of an incorrectly sized system.
To book a free no-obligation survey, call 01483 676108.
Need Professional Help?
Our Gas Safe registered engineers cover Surrey and surrounding areas. Call for a free quote or to book an engineer.
Call 01483 676108