Quote Originally Posted by DrAndy View Post
The problem with the tanks is that the pumps switch on and off depending on the useage. This causes variations in pressure which makes the tank move slightly in and out. This eventually leads to failure. How does a bypass help this?

as for perfect temperature, there is not one! for a shower or for washing up you need diferent temps, I suppose. And in cloudy weather the water temp itself is lower.
well of course that advice is subjective and I really haven't seen your system first hand just basing my advice on your post..there should not be that much expansion directly on the tank, but if there is, than a bypass can help regulate that pressure by allowing some water to bypass them altogether. If a valve is installed in the bypass once it is adjusted to the amount of pressure you have coming in without damaging expansion it should no longer have such expansion and contraction extremes anymore and should extend the tanks life..

as for the temp of course it is also subjective, of course I was speaking in general terms but certainly it shouldn't be so hot as to burn bums....