The flow of hot water has reduced and the water is very hot the cold water flow has not been affected what could the problem be

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Originally Posted by moehead

the flow of hot water has reduced and the water is very hot the cold water flow has not been affected what could the problem be

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Temperature of water is controlled by thermostat setting.
Water flow is set by in/output valve as you do not mention problems with the cold waterflow.
Please check these two first.
There also can be an obstruction inside the boiler.
;)