EJL923 said:If using a closed system with anti-freeze, does anyone know (plumbers) if there very small losses of water, maybe through the pressure valves? My water feed is always on, which i assumed is the way it should be done. When i first purchased my house and the heat needed to be checked, the plumber filled the system and then left the feed water off. I did get some air in my pipes, but not much. I dont have any leaks in the system, i assumed it wasnt purged correctly.
The feed should always be on to the system, for make-up. I'm not sure about where you live, but here in Ohio, any system with antifreeze must have a backflow on the supply as well. That's assuming it has Propylene glycol, not ethylene, then it's a whole new game.