Plumber ?
 

OK so I can Google this but thought I'd give you guys 1st try:

On a Moen single handle shower is there a screw or something to adjust the hot:cold mixture? Even full hot position right now is not really hot. I know the furnace hot water temp is OK, 120-130. It is as winter approaches the cold water gets colder.

I have thought about adding an in-line ss steel storage tank 50-100 gal (?) to take advantage of house heat to passively pre-warm the incoming cold water.

Take the handle off and unscrew the ring that holds on the cover plate. See if there's a plastic ring that can be pulled out and reinserted to adjust the limits.

-spence

Thanks Spence, I Googled it! Should be easy to fix and likely what I will do is for the Winter remove the limiter and put back for Summer (or not).

Buzz, I had to do this to our shower when we moved into our apartment. I like a steaming hot shower in the winter but our shower barely got lukewarm in the winter. A couple of tools, 20 minutes and a little bit of swearing due to a rusted screw and I was done.

So far 30-40 min swearing, stripped the set screw on the handle! Wouldn't budge even after WD40.

Had you had a few Heady Topper's you wouldn't have cared!

-spence