Welcome to City-Data.com Forum!
U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > House
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
 
Old 10-20-2010, 02:32 PM
 
1,476 posts, read 2,017,074 times
Reputation: 704

Advertisements

We recently moved into a 20 year old home. We can't get good hot water pressure in the master shower, which is upstairs with hot water tank in the basement. DH turned up the temperature on the hot water tank to as high as it goes. Very hot water comes out of the master bath sink. But the master shower got hotter but not that hot and the pressure is very weak. We can get the pressure better by adding cold water but then the temperature isn't hot enough. With winter coming on and chilly early morning temps, we really want to get this resolved....Any suggestions of what to do or who to call? TIA
Reply With Quote Quick reply to this message

 
Old 10-20-2010, 03:03 PM
 
28,455 posts, read 84,914,994 times
Reputation: 18723
Default Mixer valve...

The thing that turns on the shower is called a "mixer valve" because it takes the hot and adds in cold. There are literally dozens of styles of the working parts and most are designed to limit the ability to get scalded with an excess about of hot water like when someone flushes the toilet. That is known as a pressure balancing design and is code for new construction.

Some older units can be serviced, but if yours is as old as the house I would suggest getting a whole new assembly. This not an area to skimp on. I really like the ceramic disc units from Grohe. They have lots of trim options. If you get something in simple chrome it ought not be terribly expensive. These are not super complicated to install, but if your old mixer valve is much smaller than the new assembly it may be all but impossible to solder on a new one with opening up the wall. You may want to get a plumber for this.
Reply With Quote Quick reply to this message
 
Old 10-20-2010, 04:42 PM
 
Location: Knoxville
4,705 posts, read 25,182,234 times
Reputation: 6129
There are several reasons why you have these issues. It could be one or more of the following...
1. Static water pressure is too low at the house. It should be no higher than 80 psi and the "average" normal range is 45 - 65 psi. If you have low static pressure, you will not get good flow, especially upstairs when other things are running.
2. Your house could be plumbed with mostly 1/2" pipes instead of 3/4" for the main runs and 1/2" for short runs. 1/2" pipes carry much less volume of water (gallons per minute), so when you put a load on the system, you will get low flow, and hot/cold issues.
3. Like Chet said, it could be just the mixing valve at the shower that needs repair.
4. You could have some old galvanized pipes in the house (or main service line) that have corrosion and deposits on the inside reducing the diameter, and the flow.

However, it could be a combination of any of these.
Reply With Quote Quick reply to this message
 
Old 10-20-2010, 09:25 PM
 
6,205 posts, read 7,419,953 times
Reputation: 3563
Just wanted to add that turning water heat to maximum is not recommended and may be dangerous and wasteful.
Since you have decent hot water at the sink, I suspect the mixer valve, or the pipes that lead to the valve.
Reply With Quote Quick reply to this message
 
Old 10-20-2010, 09:29 PM
 
1,476 posts, read 2,017,074 times
Reputation: 704
Thanks for all the responses. Guess we'll call a plumber.
Reply With Quote Quick reply to this message
 
Old 10-20-2010, 10:15 PM
 
Location: mass
2,905 posts, read 7,325,666 times
Reputation: 5011
Also, get a space heater for your bathroom.

We had this "on demand" hot water heater before. It was awful. We were freezing. Not enough how water, not enough pressure, the water didn't get hot until it had run for 20 minutes (of course by then our freezing butts were out of there already), etc..... Just awful. The only thing that saved us from pneumonia was the space heater. If the water couldn't be warm, at least the air was.


Oh, yeah, since then we've installed a giant how water heater. Oh, the glory of a long, HOT shower! Best money we ever spent!!!!!
Reply With Quote Quick reply to this message
 
Old 10-21-2010, 07:48 AM
 
28,455 posts, read 84,914,994 times
Reputation: 18723
Default If it is "systemic" then sinks would effected and adding cold water would be unlikely to improve pressure...

I know barking spider is trying to cover all the bases, like a good inspector should, but I am tsking short cut of uses symptoms to rule out the really expensive stuff.


If you do not appear knowledgeable many unscrupulous plumbers will try to sell a complete repipe, costly job that almost certainly is not needed if only shower is effected...
Reply With Quote Quick reply to this message
 
Old 10-21-2010, 12:29 PM
 
9,196 posts, read 24,848,820 times
Reputation: 8585
While it won't address the pressure issue, your shower mixing valve probably has an anti-scald setting which is adjustable. It controls the maximum amount of hot water flow that gets mixed in with the cold. There would be an adjustment screw behind the face plate. It may be set too low, which is why your shower temp isn't hot enough for you.
Reply With Quote Quick reply to this message
 
Old 10-21-2010, 10:23 PM
 
Location: Ridgewood
302 posts, read 2,225,042 times
Reputation: 198
Quote:
Originally Posted by Barking Spider View Post
4. You could have some old galvanized pipes in the house (or main service line) that have corrosion and deposits on the inside reducing the diameter, and the flow.
The house is twenty years old
Reply With Quote Quick reply to this message
 
Old 10-22-2010, 09:26 PM
 
Location: Knoxville
4,705 posts, read 25,182,234 times
Reputation: 6129
Ok
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:


Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > House
Similar Threads

All times are GMT -6.

© 2005-2024, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Contact Us - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37 - Top