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I'm in Canada, where the standard is NPT. I just put in a heat pump and shut off the hand valves but I want the rads in the room to warm up if the heat pump can't keep up. NPT thermostatic rad valves are available but are hellish expensive. The sizes I have are 3/4" and 1". The system used to be gravity feed but is pumped now. DN20 and DN25 thermo valves from overseas are much less expensive. My question, is there a way to fit the DN style thermostatic valves in place of the NPT hand valves? Could they be replaced with smaller valves?
Pics of current valves as installed.
Pics of current valves as installed.
