Based on what I have been reading from you expert CC folk that seems to be the case. However I only saw mention of 20-25% oversizing of rads and mine is closer to 30% now I have recalculated the radiator sizes required.
These are the numbers:
Required Output Total = 5954W
Required Output + 30% = 7740W
Radiator Output Total = 7807W
Having cavity insulation and the required 280mm+ loft insulation dropped the overall number by more than 1.5kW Good for the efficiency but now hard to find a boiler to modulate that low, perhaps.....
This is turning into a fine balancing act imo I'll stick to wireless and networks, much easier to figure out
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