R
ringi
So as to get the best condensing when running heating, the flow temperature from the boiler needs to be set as low as possible, by installing radiators that are sized for 50c => 30c (often called oversized.) However the DHW tank must be heated to above 60c, so needs a flow temperature from the boiler of 70c.
Yet most system boiler I have seen only allows one flow temperature to be set, does this not make it impossible to operate a system so it condenses most of the time while running the radiators?
Also combi are about with a modulation range of as such as 10:1 but system boilers seem to have a much lower modulation range, how come?
(I am staring to consider the heating options for a property I brought at auction last week; it will have 5 bedrooms, ideally each on its own zone, as I will be letting it “room by room”. However it has solid walls, so the peak heating demand will be high.)
Yet most system boiler I have seen only allows one flow temperature to be set, does this not make it impossible to operate a system so it condenses most of the time while running the radiators?
Also combi are about with a modulation range of as such as 10:1 but system boilers seem to have a much lower modulation range, how come?
(I am staring to consider the heating options for a property I brought at auction last week; it will have 5 bedrooms, ideally each on its own zone, as I will be letting it “room by room”. However it has solid walls, so the peak heating demand will be high.)