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its a 50litre. I have no intention of touching the cylinder, just the simple stuff that I as a competent diy'er can do.

Dear All, I have an annexe with a heatrae sadia multipoint electric cylinder with external expansion vessel supplying one tap and shower. When I turn the hot tap on it loses pressure after 20 seconds or so. The thermostatic shower also often loses pressure and I have to keep turning the temp up...