M
monks
Hi, Please can someone point me in the right direction? I have a central heating system fitted in the 80's. It has a Potterton Profile boiler, a hot water cylinder and two tanks in the loft. One for the heating and one for cold water storage. I extended the system with 5 new radiators and fitted a new standard hot water cylindewr and had to fit a new pump after it gave up the ghost. The old pump was an old blue Myson with no details on it. I bought a Grundfos 15/60. Now when I turn the boiler on I get a stream of water coming out of the vent pipe in the expansion tank. I tried setting the pump to 1 but it still runs out. Is the pump too powerful? Can anyone suggest what may be wrong?