There seems to be a lot of thermostatic valves on sale but few pressure balancing ones, twenty odd years ago combi boilers were a rarity but these days … I’m not a plumber either, but I have a Worcester Bosch combi boiler Greenstar 28i Junior Mk III with a gravity fed thermostatic mixer bar shower
I have a thermostatic shower valve and a combi boiler and seem to remember somewhere someone saying that the two should not be combined. The valve has only been in use a little over a year. During that time the pressure hasnt been what it was previously with just a mixer valve.
Sorry for the boring thread but STW usually has a bit of helpful advice with stuff like this! Finally got a plumber in to fit a mains shower after almost 2 years of putting up with a temperamental/weak electric shower. We have a glow worm swiftflow combination boiler so no hot water tank etc.
Combi boilers generally provide the highest possible water pressure and are compatible with a shower mixer to provide hot water on demand. Suitable shower types: Thermostatic … Thermostatic mixer shower—Incorporates a thermostatic valve which keeps your water at a constant temperature.