Hi all
Need some advice regarding the new condensing boilers, and sizing. I understand about the requirement that the return flow temperature is important to get the boiler to condense and this is why you need to size the rads more carefully these days but using the whole house calculator I am between the Worcester 18 & 24 RI in required watts. It states I need 20Kw but if I increase the roof insulation it falls to 18Kw and maxing the insulation down even lower to 16 Kw and this is with a 3kw water input. In the old days I would have just used the 24Kw and job done but new technology and higher efficiency boilers makes me ask !!!!
Now is it better to run an 18Kw condensing boiler at the high end of its output or run the 24Kw boiler turned down ? I will be increasing the loft insulation and adding extra wall insulation on some of the walls when I board them out internally.
As an overview, does an 18Kw boiler sound right for a detached three bed, one bathroom bungalow in the cold north ?
all the best & thanks Roy
Need some advice regarding the new condensing boilers, and sizing. I understand about the requirement that the return flow temperature is important to get the boiler to condense and this is why you need to size the rads more carefully these days but using the whole house calculator I am between the Worcester 18 & 24 RI in required watts. It states I need 20Kw but if I increase the roof insulation it falls to 18Kw and maxing the insulation down even lower to 16 Kw and this is with a 3kw water input. In the old days I would have just used the 24Kw and job done but new technology and higher efficiency boilers makes me ask !!!!
Now is it better to run an 18Kw condensing boiler at the high end of its output or run the 24Kw boiler turned down ? I will be increasing the loft insulation and adding extra wall insulation on some of the walls when I board them out internally.
As an overview, does an 18Kw boiler sound right for a detached three bed, one bathroom bungalow in the cold north ?
all the best & thanks Roy