I won't go into the specifics here because it'd be far too long, but in a system I'm building I have two hot supplies - one between 25C and 35C, and one between 45C and 70C.
I want an output temperature of 40C, and to mix no additional cold into the system. Will a thermostatic shower mixer do this? The engineer in me says 'yes, the wax will still expand and contract according to the overall temperature', and the plumber in me says 'bUt ThAt'S NoT WhAt It'S DEsiGnEd FoR!!?'
If it won't, has anyone got any smart ideas on how to do this?