Ecodan 14kW hot water
Where is your water tank? I'm wondering how it gets so cold, way below room temp. Does it ever actually get to 50 deg at the taps?
I suspect that the temperature sensor may be low down in the tank, such that when hot water is drawn from the tank it is not too long before the cold replacement water from the mains hits the sensor, causing the quick reduction in temperature reading.
I suspect you have your hot water on a timed schedule so that its only allowed to come on at particular times of the day.
If you go to the hot water menu does it show the clock symbol by it, if it does then that means its on a schedule. If you want it maintain the hot water temp 24/7 then press the button under tap icon so that it shows the play symbol, this means its on constantly and will heat the hot water as soon as it drops below 45C as you have a 5C drop temp.
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