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Not sure about size, I know the pipes are smaller than they should be but never had problems with the rads before new boiler installed. Also the rads that are taking too long to come on are completely open on the valves. A chemical was put through the system when the new boiler was...

Make of Boiler: Alpha CD18R, Capacity: 5.4 & 19.6kw (18 400 & 66 800 Btu/h). Pump: this is whats on pump... 1~240-50HZ and MuF:2-400V. The auto balancing bypass valve is set to 4, not sure if this is correct or not. Ive also noticed now that the pipes leading to the rads that are...

I had a new condensing boiler installed in January. Radiators took a long time to reach proper temperature after installation but plumber thought it might be something to do with pipes being too small, even though I had no problems with old boiler. So I thought maybe a pump problem. I...