Re: Mowen shower control
Depending on the age of the faucet, it could just need to be adjusted. For about the last 15 years shower faucets have been pressure and temperature balanced. The ones I've dealt with used a tooth cam behind the handle to control how much hot water is allowed through the valve. Check to make sure that it's not just a simple adjustment before trying to replace everything.
To change a valve requires access to the plumbing inside the wall. Usually this is accessed through the shower side, but can also be done from the back. It's not a job for a novice, particularly if your home poses problems with these types of repairs.
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