Hello want to know on how do you calculate size of expansion tank for closed heating systems . for example 500 meters of 16mm underfloor heating and 4 double ~1000mm radiators , hot water cylinder coil , and oil boiler
I think 16mm UFH pipe is 12mm ID so 500M = 56L, boiler+cyl coil, 30L, 4 rads, 40L, total 131L plus 10% for the cat = 144L, suggest a 15L EV or nearest.