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View the thread, titled "Hot water, but only just" which is posted in Bathroom Advice on UK Plumbers Forums.

Got a Worcester combi boiler that gets serviced every year through BG, but we are finding that the hot water is never that hot.

I think the water is passing through the boiler too fast and doesn't get a chance to heat properly.

Very noticeable on the bath, where we have to close the tap down quite a bit until the flow rate reduces coming out the tap.

Is there a way to reduce the flow rate as it goes through the boiler?
 
Even though to get hot water you need to close the tap to a trickle but believe you can get adequate flow - albeit if cold, the alternatives are simply that either the **amended as mentions boiler repairs**. I realise that either of these should affect the total flow and not just hot flow, but I have seen exactly this symptom on a W-B 34 combi in a very hard water area (Bath). If either prove to be the problem, you could - after fixing - also install a CombiMate to help reduce its tendency to scale the DHW side (the CH side should not scale).
 
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