got new job in a big house with three floors, house has three boilers, myson marathon and cylinder supplying basement rads and basement hw, gw flexi 30hx supplying heat to ground and 1st floor and another gw 15hx supplying hw to cylinder supplying ground and 1st floor, obviously customer wants to scrap the lovely old marathon etc to make room for work in the basement, so needs a supply new supply of dhw and heat for the basement, hw is not going to be a problem, but what is troubling me is getting enough heat out of the gw 30kw counting up all the rads its currently supplying 17.7kw of radiators and I want to get another 11.6kw out of it, the pump is a grundi 15.50, the primaries are 28mm, would I be right in thinking you cant get much more than 20kw out of this set up ? and hence I'd need to go up to 35mm?
bigger pipes ?
- Thread starter moroswon
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