similar to another post someone just asked but I’m in a 3storey house with my immersion tank on middle floor. Coming out of the top it goes upstairs and there is a t-connector in the airing cupboard on the middle Flor coming out which feeds the lower floors. I installed a pump in the top floor next to cold water tank and linked up a pump to both to feed my new en-suite on the 2nd floor. Everything good ... Then decided that the downstairs hot water pressure sucks and decided to fit a pump onto the downstairs feed from the immersion tank... fitted it up and it works fine... I’ve now noticed that the downstairs pump comes on whenever I run the hot tap from the other pump ... I can understand that is down purely to the fact the water pressure reduces on the hot circuit so it thinks hey I need to pump hot water and therefore it goes off...oddly enough the other pump upstairs doesn’t come on if I run water downstairs... 2 questions really. 1. Does this seem like it’s working as expected 2. If not will this cause issues with the downstairs pump I had fitted?