.  I have it plumbed to the radiator with a

cutoff valve. I would strongly suggest one as should a leak develop this
would enable you to shut off the hot water.

Ed, you need TWO shut off valves if you expect to close off a break in the
heater core.  One will stop the hot water from going through the core, but
there is enough pressure in the system to force fluid out from the socalled
suction side.

Bob Darrah

 
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