I am fitting a new radiator and central heating magnetic filter fernox omega tf1 and was going to do a mains water flush of the system. My question is that my filling loop for the boiler connects to the flow side, I will be turning off the iso valve on the return side of the boiler, do you think I will still be able to monitor the system pressure on the boiler dial while doing the flush as the filling loop is on the flow not the return side.
Victor
Victor