I recently had my boiler (wallstar) serviced. Since then the radiators heat up when I'm heating just water (CH off)heat is off. The water in the tank is not hot but my radiators are hot. It's as if the water for the tabk is being directed to radiators. If it helps, during the service a 60 x 65 nozzle was replaced. The radiators are still heating via normal means also. I could almost take this now but then I think it's wrong, if it was summer my radiators would be heating when I just want hot water for showers ect.
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