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I have a mains fed combi boiler. The cold supply for the basin, Toilet and bath mixer are fed via a storage tank with 31/2 -4M head. This is causing a massive flow imbalance in the shower mixer, so much so that even at just 1/4 turn of hot is too hot for a comfy shower. I can turn the...

Please Help. My header tank is filling and then overflowing. Am pretty sure it is associated with using the shower from a bath / shower combined tap set, and probably cold going up the expansion. What is the best cure. If its a non return valve, where does it fit? Is there another cure? Also am...