Before the combi the shower was very sensitive but quick to adjust, so within a few minutes I could get it to a comfortable temperature. Now with the combi, it is either scalding hot or freezing cold. My suspicion is that it is still just as sensitive but that it is taking ages to change i.e. it is too hot so I turn the knob to cool it down, nothing happens for ages so I turn it down again, then again, and finally it catches up and is freezing! Does this sound likely? We have been told that it is because the water pressure for our area isn't very good and so it is something that we will have to put up with. Thanks in advance!
Is it just the shower that has this problem or do you see it at other fixtures as well?
Perhaps the shower is not suitable for mains pressure or the cold supply feeding the shower is still being fed from the tank.All mixer showers need to have equal pressure from the hot and cold,ie hot and cold fed from the tank or hot and cold fed from the mains.
A possible reason is your new combi-boiler. A combi-boiler provides hot water instantly which is fed from the cold water mains. So essentially, when you turn a hot tap on, it has the same effect on water pressure as turning a cold tap on. So the reduction in water pressure means the shower water can become hotter. Turning is down will take a while for the rest of the water that is hotter to come out of the shower system - and keep turning it down will make it cold when the hotter water is out of the system. This is the same when you keep turning it up. This is a slight problem in my house. I have an electric shower that runs from cold water mains, and as soon as someone turns any tap on (hot or cold), the water pressure is slightly reduced and the shower water starts getting hotter. I hope this sort of helps?
