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hi twgas, I have an aqualisa thermo shower. Do you think I may need to replace the cartridge in it? The people who owned the house b4 me had replaced it at some time in the past as they left the old one here.

Hi, I have a hot water system with solar heating for the water. The heating works, the hot water is also heating in the cylinder but when I turn on the tap, after initially running hot, it goes to lukewarm. If I run two hot taps it seems to then be hot but as soon as I turn one off, it goes...