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- 1 Feb 2005
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Planning on putting an entirely new system into an old house that has never had one before.
My professional advice so far has been to go for a combi but the house is pretty big and its going to need a fair few rads. like 14-16. over 3 high ceilinged floors.
I have done several different heat loss calcs and get an answer of between 24kw at the lowest and 34kw at the highest. My best guess is that we need 30plus.
So my questions are:-
Is a combi going to cope OK with this? (Probably looking at a condensing one like a Baxi 133HE plus or a Vaillant Ecomax 835e)
I am particularly worried about the pump having to work over 10m of head and 30kws worth of radiators but surely a 35kw boiler will have a pump designed to cope with 35kw of rads?!?!?
Also should I steer clear of a condensing while I still can? As I say it's a big house and we are expecting a biggish bill so the extra effciency would more than pay for a short (10year) life but will we really get the higher efficiency and will it last 10 years?
Thanks
My professional advice so far has been to go for a combi but the house is pretty big and its going to need a fair few rads. like 14-16. over 3 high ceilinged floors.
I have done several different heat loss calcs and get an answer of between 24kw at the lowest and 34kw at the highest. My best guess is that we need 30plus.
So my questions are:-
Is a combi going to cope OK with this? (Probably looking at a condensing one like a Baxi 133HE plus or a Vaillant Ecomax 835e)
I am particularly worried about the pump having to work over 10m of head and 30kws worth of radiators but surely a 35kw boiler will have a pump designed to cope with 35kw of rads?!?!?
Also should I steer clear of a condensing while I still can? As I say it's a big house and we are expecting a biggish bill so the extra effciency would more than pay for a short (10year) life but will we really get the higher efficiency and will it last 10 years?
Thanks