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 shower - no hot water
Author: diesel1234 (MO)

I am having a problem with hot water in stand up single handle shower. Basically I just purchased the home and there is hot water in every room and fixture, except in the master bedroom bathroom which is a stand up shower with a Mixet Single Handle. The stem unit has been pulled out and is ok as is the seats and springs, the water lines coming from the wall that go into the stem, the cold has high pressure but the hot is minimal at best, this is straight out of the wall without fixture or anything attached. The piping feels hot it is just not coming out the same rate as the cold, does this mean I have a clog in the line? I did scrape calcium form the outer tip of the pipe leading to the stem, however it takes a 90 degree turn inside the wall to go to the other bathroom. The other bathroom is first in line from the hot water heater, I am having no hot water issues in the other bathroom, so I believe the problem is in the pipe between the other shower and this one, is this a safe assumption, any suggestions?

The shower may not have been used in 3-4 years as previous owner was elderly and may not have ever used that shower.

One of my main confusions is the water coming directly from the wall is slow from the hot water pipe and normal, or high pressure, from the cold water pipe. This would mena the problem is not the assembly or handle, but I am not an expert and have no idea.

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 Re: shower - no hot water
Author: hj (AZ)

IF you remove the stem and the hot water has a slow stream then it has to be something in the piping. If the slow stream occurs with the stem in place, you could have a pressure balanced valve, I am not sure if Mixet made one at that time however, with a stuck balancing spool. If so, then a new stem will cure the problem. It is a common problem with valves that are not used frequently.

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