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Thanks for that JEZZY. All valves are fully open and the throttle is fully open , the flow rate when on dhw is good the problem seems to be that the the water is only getting hot when the flow is slowed right down. Glow worm tech-support seem to think it may be a scaling problem in the heat...

Can any body help !! I have a problem with a swift flow 80. ch works fine, but the dhw has a slow flow rate but does get hot at lower flow rate ,can i increase the flow rate and temp. :? :?