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Stephen[_2_] Stephen[_2_] is offline
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Default boiler output: how many btu's do I need?

Hello,

When fitting a boiler, how do I work out what output the boiler should
have? I can add up the rating of the radiators to give the power
needed for the central heating but what do I add for the hot water?
Also do I add a fraction to compensate for losses?

Thanks.
Stephen.