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The black device on the boiler labeled "VXT" that has the red digital "058" reading tracks how much makeup water has been added to the system. In theory the number means the numbe… (View Post)2
You need the inside boiler temperature, not the exterior surface temp. Inside temp will be whatever temperature the boiler maintains for whatever process is ongoing in the boiler. Then run the calcul… (View Post)1
If the boiler will run continuously and only a few radiators get hot, it sounds like the boiler is now underfired somehow. Did the contractor check the gas pressure at the burner? You could also cloc… (View Post)3
From the engineering standpoint larger pipe allows for shallower slopes for the same flow capacity, which gives more flexibility making gravity flow work on longer runs. Material roughness also effec… (View Post)3
@alexru1 do all your radiator vents close on a normal call for heat? Also, do you know if your boiler is grossly oversized relative to your radiator capacity? The others have good things to check. Be… (View Post)1