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personally if i was that concerned about heat loss , kilowatts , energy efficiency,warm air agitating cold air molecules i would be thinking get a grip and move to oz !!
 
Many years ago a guy designed a plastic tube with a fan in that circulated the warm (high up ) air down the tube and around peoples feet. Cant remember what it was called , im sure it won some sort of award
 
Comin back to radiators, they are efficient in their application but never or not in a church
 
In warehouses you get de-stratification fans which is probably similar to what you're on about Toddy, although I dont think they would be any good in a church as they can be quite noisy.
 
Our church installed IR heaters which seem to be the best. Trouble is they don't heat your feet. Ideally, UFH would be best.

The church in a neighbouring village had its system installed by a local guy who put all the pipework and radiators under the pews, so it is actually very comfotable for all except for the vicar!
 
as i say, most chuches if not all churches i have worked on have a combination of rads and coils on a large one pipe system, thay work fine

to improve the heat up time and the issue of possibel stratification the easiest way would be to instakk fan covector, these can be high level and simply blow the warm air down.

i would if designing combine rads and fan convectors
 
Thanks quality, a man that understands.Rads in a tight environment work as good as they can.With the big spaces however, we have another problem, condensation.Temperature differences within a space of more than 5C starts the condensation problem, hot and cold spots.Water running down certain areas and its normally in the area where heat source meets the cold penetration.I say penetration because if there is not enough heat in the area the cold starts to penetrate in.Heat is automatically attracted to cold.This debate is still going on because everyone of you guys have good knowledge in this area but we don`t have the perfect solution.
 

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