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Does anyone know whats the best pump to use to recharge an expansion vessel, i wanna try that before i replace the PRV in a heatline boiler.

Hi all, Got a customer with a horrible fault. The system is a myson housewarmer back boiler, gravity hot water, pumped central heating. randall 3020p timeswitch no room/cylinder stat The problem is the RCD is tripping aswell as 2 3amp fuses blowing. 1 fuse spur and another for the pump...