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Default Boiler sizing from heatloss calculations

Hi,

I've done the heatloss calculations on my house and came out with a
figure of 8.4kW. What factor would I need to multiply this figure
with to get the boiler size? I am assuming that I will need to allow
7kW for the DHW.

Is there any disadvantages in oversizing a modern (modulating)
condensing boiler (ignoring the slight difference in purchase costs).

FYI: I plan to get a heatbank like the McDonald Thermflow.

Cheers, W

 
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