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thank again - and for the explanation - I will try the DHW output temperature at the boiler while the shower is on when I am back at home.

the shower was fitted by the company installing my new bathroom, including the shower - this is something I can ask them. Thanks

Can any body help? I have had a new shower installed (Grohe) connected to the combi boiler (Heatline) but cannot find a way to have consistant water temperature. It runs hot for 4 -5 minutes, then cold and back up to warm. I have lowered the combi boiler water temperature to the lowest it can...