Hello,

In both of our upstairs showers, it is very difficult to adjust the water temperature. There are two knobs on each shower, one for hot water, one for cold water (it is not a single, adjustable knob).

Here's the problem: When we turn on the hot water, it is scalding. If the cold water knob is then turned on, even to what would seem to be a trickle (that is, the knob is turned a mere fraction of a twist), the water becomes freezing. There is no in-between. Aside from dancing into and out of either a scalding or freezing stream of water, the result is that the hot-water heater drains after a couple of minutes, and only freezing cold water remains.

I've searched through the site, and just don't understand what I need to be looking at, or what to do. I'm at my wits end, here, and would be grateful for any tips.

Thanks so much,
Jess

Has it always been like this? You may have to access the cartridge in both showers and adjust the hot water control vale, if thee is one, if not, I would probably replace with a cartridge that has hot water control in it. You may need a plumber to adjust to the proper setting. Razor

Has it always been like this? you may have to access the cartridge in both showers and adjust the hot water control vale, if thee is one, if not, i would probably replace with a cartridge that has hot water control in it. You may need a plumber to adjust to the proper setting. Razor

How do I get to access the cartridge from the shower?

This may or may not be a cartridge, could be valve stems. Remove the handle and the escutcheon plate tell us what you see or send a pic.