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Non-pressurized flow center?
Ground source heat pump system with closed loop wells.
I'm looking at a non-pressurized flow center (Phoenix Energy Supply). Installed and has been in operation.
I'm not quite sure what to make of it.
I don't think there is an expansion tank on the system so let's say the system is not pressurized.
How would you know there is enough water in the system?
What is the advantage?