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Hi, I believe it goes up higher as the main heat loss of a ground floor is at the edges hence in new builds its all about an insulation envelope. So the heat loss at -3 at the area of outside parimeter i.e a straight 36m is less than a 13c differance over a full 84sqm. Hence the problem :-)...

Hi All. On the recommendation of a few here I am using the Kermi Heat Loss calculator which I have found to be great once you put in the time and know the building construction but I do have one query. I reside within a first floor apartment with my own ground floor entrance, only two...

Thanks for the tips re over sizing, the boiler is a 24kw combi so is well over sized, as the largest room is also the north facing one and has three windows 20% sounds a good idea. I set the outside design temp to -3 to all for this cold spell becomming a annual event. For those who want to know...

Just one thing, I know you guys get a lot of requests on here for rad sizing, perhaps it is a good idea to as you advised myself to tell people to do a room by room calc using say Kermi and a Boiler sizing, the double book keeping of rad sizing, the fact the boiler sizing and kermi have matched...

Thanks. Getting 9.18 when I remove the 2kw for hot water. So 31345 BTUs. Quite intresting as the Kermi rad cals are within 5% of the boiler sizing calc. Should I be allowing extra for the fact the apartment is on an exposed site with no shelter on any side at all. Completly open to wind and rain...

Thanks for the link, even more confused now :-) Some come out spot on others are a mile off. Maybe I will just over size by 20% and add trvs :-)

Hi. I used the Kermi calculator to work out the following calcs. First Floor Apartment. Attic above, 300mm insulation. Non insulated concrete follow assumed temp of 10c. Non insulated cavity walls. External walls factored into tool. Not factored in is the fact site is very exposed...