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Water warm but not hot?

My nearly-new ravenheat combi works ok but the water does not get hot enough. Fitted new stat, got the dial up to max. What can I do? ygoodall@btinternet.com
Alistair Gilroy, February 2009
did it work ok at first or has it always been a little slow?

could be too much flow need to check with weir gauge and check specs

stedo, February 2009
link Click here to see other fixes for Ravenheat.