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[fryedaddy]

I just picked up (6) cast iron radiator for my green house.

I'm hoping to keep the G.H. heated to about 50 during our milder N.C. winters.

I've been reviewing the tempering valves but my father-in-law has a bypass and
standard valves to his. What would you reccommend?

He also runs (4) radiators from (1) line in lieu of a manifold and seperate zones with success.

[shepherd boy]

Why would you use a tempering valve?

[slimjim]

I think what he is talking about is a temp sensing valve, it senses air temp and controls water flow to each rad in the loop, in order to do this the rads need to be plumbed in parallel, the circ or mono flow tee would pump water through the supply and back the return, each rad would be connected to a tee on supply and another on the return, as the valve senses a drop in air temp it opens and allows water to flow from the supply through the path of least resistance ( the rad ) and back to the return.

[fryedaddy]

Slim,

thank you that is correct.

Since this will be a greenhouse would I need it?

[slimjim]

No but you will need to control the heat somehow, I personally prefer to use a relay to control the circs, don't run them in series or you will be sending very cool water back to the boiler and reduce the flow dramatically.

[fryedaddy]

Thank you!!!