EcoRenovator - View Single Post - Hydronic Floor pump frequency vs water supply temp?

michael · 03-09-13, 07:21 PM

My first suggestion wd be to turn down the boiler temp to 130 deg max for both safety and savings; I try to keep ours lower than that. Our radiant floor, which has been in operation for 26 years, is fed water at 110 deg. The water comes out of the heat exchanger at 120-125 and is modulated down to 110 by means of a tempering valve which injects some of the return water into the incoming hotter water. The house stays at a never changing 71 degrees. The circulating pump turns on and off a bit, but in general it runs for several hours at a time as the floor changes temperature very slowly, so the thermostatic cycling of the pump is kept to a minimum. I believe you will save more energy with lower water temperatures than you could ever save by trying to shorten the pump on time.

03-09-13, 07:21 PM	#24
michael Michael Join Date: Feb 2013 Location: mendocino, california Posts: 67 Thanks: 7 Thanked 2 Times in 2 Posts	My first suggestion wd be to turn down the boiler temp to 130 deg max for both safety and savings; I try to keep ours lower than that. Our radiant floor, which has been in operation for 26 years, is fed water at 110 deg. The water comes out of the heat exchanger at 120-125 and is modulated down to 110 by means of a tempering valve which injects some of the return water into the incoming hotter water. The house stays at a never changing 71 degrees. The circulating pump turns on and off a bit, but in general it runs for several hours at a time as the floor changes temperature very slowly, so the thermostatic cycling of the pump is kept to a minimum. I believe you will save more energy with lower water temperatures than you could ever save by trying to shorten the pump on time.