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how can i fix it?

i have a pottrrton suprima 30-80 boiler, i put the hot water on but it only warms it even though i have the thermostat up to 60 on the tank, so we have to put the emersion on which costs a lot
l debbage, October 2006
poss faulty stat, try removing it from the tank for about an hour and see if it gets hotter / or your coil in your tank is badly lime scaled up

hi-spec plumbing, October 2006
link Click here to see other fixes for Potterton Suprima 30-80.