Radiant Heat. Should I raise the temp?

HomerJSmith

Doesn't the Nobel have a factory installed boiler pump in the boiler cabinet?

hot_rod

https://forum.heatinghelp.com/discussion/comment/1876606#Comment_1876606

The Nobel combi has a pump, I believe, the Knights come with a pump, I don’t think the heat only Nobel comes with a pump?

The indirect look like it has a smaller pump, an 007 maybe?

So if the boiler is happy, and not kicking out on limit, then the same pump should work on the boiler loop

For the heat only version they provide the pressure drop and pump selections making me think the pump is installer provided. A 007 is adequate for the two smaller sizes

If that is a 150 it looks like an 0011 or 0013 is the recommended circ

bjohnhy

I agree with hot rod on "This just isn't the correct way to pipe it no matter how many ways you look…"

However, since there are only two 2ndary circulators (indirect DHW circ and the radiant loop circulator) re-piping the tight H connection (into typical closely spaced Tees) will probably have no significant change on function or efficiency, IMHO. If there are future plans for additional secondary loops, such as a hydronic coil for the air handler, it would be wise to repipe the tight H as outlined by hotrod.

https://forum.heatinghelp.com/discussion/comment/1876601#Comment_1876601