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Looking for make up water options on closed loop radiant system
I am looking for options for makeup water for a radiant floor heating system in a shop in Seattle WA, with no water.
System has 3 zones with 3 - 230' loops of 1/2"pex, 2 zones in concrete on 1st floor, 1 zone between joists on second floor, using a 75gallon domestic hot water heater.
System will run fairly constantly to establish a core room temperature around 55 degrees with forced air heat to bring room up to working temperature when shop is in use.
Make up reservoirs I have found are cost prohibitive. My initial plan is to use a #30 4.4gallon expansion tank which should be oversized enough to buffer, then monitor manually. I am not sure how to monitor the water level other than monitoring pressure and occasionally topping off to the design pressure (15psi) with a hose.
Any help or direction appreciated.