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How many shut-off valves for hot water cast iron radiators?
I'm putting in a entirely new 2-pipe hot water heating system with cast iron radiators. Should shut-off valves for each radiator be installed on just the supply side pipe or on both the supply and return side?
What is the main the purpose of the shut-off valve(s)? i.e. is it mainly to let you turn a individual radiator on/off or control the flow? Or does it let you service/remove a single radiator without having to turn off the whole system?
The radiators will be in a rental unit. Any thoughts on if I should not install any shut-off valves at all or maybe not install the the shut-off valve in the room with the thermostat... to avoid the problem with a tenant turning off the radiator but leaving the heating system on.