Radiant system setup questions

mwtuckDecember 14, 2011

Hello, I have my radiant system all setup and working, but I was just curious about the best settings to run it at.

I have a 1200 SQ ft building, running 3 loops of 300' 3/4" tubing through it. I have them all on 1 zone. It is being powered by a Hydroshark SH3-10 electric boiler 10kwh. And my pump is a 3 speed grundfos pump.

My question is this: What speed setting should I have the grundfos pump set at, and what temp should I turn the electric boiler up to? It can go all the way up to 140 degrees, but when I turn it that high, it uses full power. If i turn it to about 125, it modulates, so I assume it doesent use as much power then.

I am currently running the system at about 125 degrees, and have the pump on the low speed. What are your opinions??


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The detailed heat loss and radiant design that should have been done to make sure the install would work will give you the water temp, flow rate and desire floor temp specifications.

    Bookmark   November 3, 2012 at 11:15AM
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