My in laws have a mixer shower that me and he fitted a few years ago. Their system then was a gravity fed solid fuel system, with a copper cylinder and a massive cold water header tank in the loft. The shower was fed from these two tanks. They have now had the system changed to a gas combi boiler and all is fed at mains pressure, the main reason for the change is they are getting on a bit and the thought of having to go for the fuel at the bottom of the garden started to look less appealing!
The problem is if anybody flushes a toilet, turns a cold tap on etc. when the shower is in use it gets a bit hotter due to the 'now shared' cold water pressure. It doesn't get hot enough to scald so isn't a major rproblem but if it can be quite easily and quickly remedied the FIL would like to do it. Due to him being nearly 70 and the bathroom looking really nice with flush fitting shower valve and head, replacing it with a thermostitic mixer is NOT an option.
Any ideas / thoughts most welcome.
Cheers
John