Hi I have a Ideal Standard E type Cf50 boiler. When the heating is on there isn't enough hot water for 2 showers and the water at the taps is just luke warm. When the heating is off there is plenty of hot water at the shower and the water temperature at the hot taps is unbelievably hot, scolding almost. Any ideas?

You would have to have a indirect cylinder and motorized valves ,clyinder stat . It could be done you would need a heating company to check it all out .

Contact a plumber

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you should have a programmer that will let you have the hot water and heating on or off . You could have a motor rised valve on the system which controls both . depends on what system you have . Fully pumped of just pumped on the heating side .

It is the shower head or plumbing that has a built in mixer or reducer.

The problem is not the water heater. The shower has a mixer or a limiter built into the plumbing so that the water wont get hot. It is a safety feature to prevent burns and protect children from scalding.

going off on a safety possible high temp unit needs service such a nozzle filter if oil or thermocouple if gas

most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

water must be set at 3lts a min ,check diaphragm valve move when hot tap is on, check microswitch ,best of luck

mixing valve must be replaced