i built an extension and upgraded my main house heating by installing all underfloor heating. And I am in a process of replacing my old boiler combi(Worcester 28cdi, see pic) to new Worcester 8000 style 35kw system boiler and 250L Megaflo unvented cylinder. there is only one small radiator in the main family bathroom in the whole system. The rest are all underfloor heating, both upstairs and downstairs. there are there manifolds in the house; one for the main house upstairs, one for the main house downstairs and one for the extension (for both floors down stairs and up stairs). Each of these manifolds consists of 6 zones , see pic for one of them.
I have been inviting local gas engineers for quote to replace the old system with new one and I am getting very confused and conflict messages as to weather a low loss header needs to be fitted into the new system. some say you need it, other say you do not need it, because although you have 3 manifolds (i.e. 3 plumbs), but all underfloor heating which they will run on low heat and hence the demand on the boiler will not be as high.
any advise please whether I need a low loss header or not and why.
I have been inviting local gas engineers for quote to replace the old system with new one and I am getting very confused and conflict messages as to weather a low loss header needs to be fitted into the new system. some say you need it, other say you do not need it, because although you have 3 manifolds (i.e. 3 plumbs), but all underfloor heating which they will run on low heat and hence the demand on the boiler will not be as high.
any advise please whether I need a low loss header or not and why.