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@skinny
Has anyone used heat punk for calculations? I'm using it but I feel it's overestimating the heat loss, 80w/m2, which actually sits well with the heat geek cheet sheet. Either we are about 9000, and 4000 more in attic. We have 22mm pipe and 15mm off to rads, all rads are bit and double/tripe, so really wouldn't need to change anything inside.
It seems the heat punk calculations don't work for my radiators. Çooking up the w/M2 for my radiators v what heat punk days at a certain temperature there is a discrepancy. This would make sense as running my boiler now at 50 C it's well above the room temperature actual than heat punk calculats.
The complication is I don't need to heat attic all the time, so getting a pump that runs everything would mean it's running at a lower % of overall capacity if the attic isn't being heated.