We have a Glowworm 38hxi downrated to 21kw as we have radiators + dhw totalling about that. We have the flow temperature of the boiler set to 75.
We had a new radiator installed the other day so the system was drained down for that (I increased rating to 21kw from 19kw due to the new rad being 2152 watts.
However, last night, when checking the rads were balanced, I put the thermostat up to 30 and after 1.5 hours the boiler flow temperature was only showing as 55 and the temp in the house had only risen from 21 to 22. All of the rads warmed up evenly so they do appear balanced but none of them ever really got hot. The return temp at the boiler was about 12/13 less than the flow temp.
Why didn't the flow temp get up to 75?
Many thanks!
We had a new radiator installed the other day so the system was drained down for that (I increased rating to 21kw from 19kw due to the new rad being 2152 watts.
However, last night, when checking the rads were balanced, I put the thermostat up to 30 and after 1.5 hours the boiler flow temperature was only showing as 55 and the temp in the house had only risen from 21 to 22. All of the rads warmed up evenly so they do appear balanced but none of them ever really got hot. The return temp at the boiler was about 12/13 less than the flow temp.
Why didn't the flow temp get up to 75?
Many thanks!