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my boiler needs to be topped up each day ?

why does my highflow 400 keep dumping the water out of the over flow and need to be topped up each day.
Wallace, January 2009
What does the pressure gauge read? It will dump water out of the prv is the pressure is over 3.

If it's less than that, prv is faulty and will need changing.

Bunslinger, January 2009