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It could be a number of reasons. If it's still 'firing up' when you turn on the taps, it sounds like there could be a problem with the pump. If the pump is malfunctioning, the water will still heat a small amount of water, but then that has no way to get around the system efficiently.

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Thank you! Yes, it does fire up and the first bout of water is very hot, then it seems to go cold but if I then reduce the flow it stays warm and is fairly stable. It will eventually go cold but I'm assuming that's when the boiler stops firing due to the low flow.

I've also noticed that if I have the temperature on high on the shower, I have to reduce the flow much further to get warm water (just a trickle) whereas if I turn the temperature down, I can run it on a higher flow and achieve the same temperature.

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Q: Why is my hot water suddenly less hot Seems my combi boiler doesn't produce as much hot water as it used to The radiators dont get hot and I have to run the shower or taps on a trickle for warm water?
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