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Greetings, is there anyone experienced enough to let me know if they have ever drained down a heating zone to replace a baseboard unit and then restarted it? I understand that I have to shutoff power, close return line and then drain the zone through a hose. I am not sure about the cold water valve that feeds the heater though. Will this automatically replenish what I remove? Do I have to shut this also? I guess the other question is what is involved once the unit is replaced. Does the zone automatically recharge with water once the valaves are reopened? Any help guys greatly asppreciated!