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Sorry, didn't make it clear, the flow is not limited to 5l/min, I'm throttling it back on the tap to get the temp up. Full flow rate is much more than that. I know the obvious is to get an engineer out but that's an expensive option if there are know/common problems with the boiler I can...

Also have a gas cooker and 2 gas fires, flame on both look perfect.

Hopefully someone can shed some light on this for me: Recently moved into a new house which has a vaillent 824 combi fitted. Hot water initially would come on very hot then quickly go cold. I checked the outlets and the heating loop was getting hot on DHW demand so changed the diverter...