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Does reducing the max heat output on an ecotec plus down from 24kW to 20 kW mean that when the boiler starts up from cold for CH the gas fan does not go at the same high speed rate that it does when DHW is called for and the hot tap is turned on for full flow. That is, does ranging a boiler only...

I have a 3 year old ecoTec plus 831 that is working perfectly ok for CH but when DHW is called for the boiler has started to make a loud droning noise that appears to come from the top of the boiler around the main heat exchanger. It is nearly 3 yrs old and has had a new pump fitted, due to a...