thescruff wrote on Aug 21st, 2018, 5:08pm:Big-all post misses the point of underfloor heating which should be designed to run at a constant low-temperature I.E. 42c give or take, any addition radiators or hot water should be zoned separately or combi plus 2 or more heating zones.
Any questions please ask
the point i am clumsily trying to make is
underfloor has a greater heat up time so needs to be fully specked and the thermal efficiency off the room is very crutial as is things like open doors and heating off other areas in the house as the heat up time can be hours unlike a radiator for the same situation that can be perhaps half an hour to 40 mins
in general a radiator will give out perhaps 3 or 4 times the heat off an underfloor matt
if the heat input is say 500w an hour and the heat loss is say 350 an hour your heat gain is 150w an hour so quite slow heating up
where as a radiator for the same situation may be 900w which is less than twice the output but because the heat loss is 350w the gain is 550w or nearing 4 times the heating rate off the underfloor at least at first when you most need it
and as the heat rises the heating rate improves for a radiator compared to underfloor
indeed if your heating is off for around half the day it may take 2 to 4 hours to get to the level you want dependant on situation
continuos in this situation means on day and night