Rolfsi
New Member
I have an in-floor concrete radiant heat system. One loop is discharging water at 130 degrees from the boiler. The larger loop is discharging at 101 degrees. Is it possible for low voltage cast iron pumps to work sluggisly and thus reduce the discharge temp from the boiler? It just seems that the fuel consumption has gone down and the larger loop is discharging at a lower temp. I am suspecting the large loop pump is sluggish and the other pump is making up for it and runninging more often. I am a green horn and don't have a lot of experience with in-floor heat.