banging, cant remeber the name of boiler will find out tommorow when im passing the place
Just read original post againwhy would he need a 3 port valve, its only running 3 rads
sorry i had to remave the valves from the main pipe work as they were stuck onto the pump to tight to work on them in place so didnt have to close them in first place.
sounds like its pumping over if the tank is hot
Some hot can bubble up, but as there is no second pipe, you can't get the flow that an overpumping system can have.... just because the openvent is submerged under water, the system carn't pump over??
Just because its a combined feed & vent does not mean water carn't bubble up into the tank.
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