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Old 02-13-2016, 12:27 AM   #1
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Pressure Balance vs Thermostatic Shower Valves


My mechanical inspector is also my plumbing inspector. He stopped by my house the other day to do a rough inspection on some mechanicals and I asked him to take a look at my plumbing in a bathroom while he was there. He asked me to make a few minor changes on what I had completed at the time of his visit and also said to make sure my shower valves had "scald protection" and "pressure balance."

After researching the valves I purchased I discovered that they're "thermostatic control" valves versus "pressure balance" valves. I've called my city permit coordinator three times since this past Wednesday and asked her to have the plumbing inspector call me so I could ask him if these valves are ok, but haven't received a call back from him in three days!!!

My valves are Hansgrohe dual control valves (one temperature lever & one flow control lever) and it appears that dual lever valves typically do not use "pressure balance" technology. I understand the difference between pressure balance and thermostatic control, but am wondering if they are both generally accepted by code. Perhaps, pressure balance valves are more common and that's why he used that term? Any thoughts? I was hoping my inspector would get back in touch with me by Friday so I could rough these in over the weekend.

Last edited by bajafx4; 02-13-2016 at 12:30 AM.
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Old 02-13-2016, 07:55 AM   #2
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pressure balanced is when you loose pressure on either hot or cold, because of another fixture use, the valve automatically lowers the opposite side pressure to try and keep the temp the same, thermostatic pretty much does the same,using the temp instead of the pressure,and you can set temp limits..many of the thermostatic valves have a button to press to go past the set temp to get very hot water, sorta built in saftey so kids wont scald themselves....depending on your code either or both are acceptable...
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Old 02-14-2016, 02:18 AM   #3
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The valve needs to meet this standard balanced-pressure, thermostatic or combination balanced-pressure/thermostatic valves that conform to the requirements of ASSE 1016 or ASME A112.18.1/CSA B 125.1

Should be in the specifications.
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Old 02-14-2016, 04:07 AM   #4
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Does anyone know if Hansgrohe products meed these specifications? I don't see it mentioned. It's really going to suck if spent over $1500 on Hansgrohe products for my shower and can't use them. I'm just getting around to installing them now, but purchased them back in November 2015.
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Old 02-14-2016, 08:21 AM   #5
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Quote:
Originally Posted by bajafx4 View Post
Does anyone know if Hansgrohe products meed these specifications? I don't see it mentioned. It's really going to suck if spent over $1500 on Hansgrohe products for my shower and can't use them. I'm just getting around to installing them now, but purchased them back in November 2015.
post the exact model #, and call grohe and ask, there should be an 800 number in the product paperwork..if all else fails contact the building dept or plumbing inspector and run it past him/her....also where do you live? codes are different in different areas..
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Old 02-14-2016, 09:58 AM   #6
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Thanks! I've been trying to get in touch with my plumbing inspector since this past Wednesday at 8am when the city office opened, but I will continue to try next week. The city clerk tells me she's delivering my messages and said that she even gave him one handwritten note when he was in on Thursday to pick up some paperwork. Not very impressive, but whatever...

Also, I'll call Hansgrohe on Monday.

For the time being, here's the trim and rough in valve:

TRIM: http://www.hansgrohe-usa.com/suche.htm?searchtext=15752
ROUGH-IN BOX: http://www.hansgrohe-usa.com/article...-01850181.html
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Old 02-14-2016, 10:30 AM   #7
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Quote:
Originally Posted by bajafx4 View Post
Thanks! I've been trying to get in touch with my plumbing inspector since this past Wednesday at 8am when the city office opened, but I will continue to try next week. The city clerk tells me she's delivering my messages and said that she even gave him one handwritten note when he was in on Thursday to pick up some paperwork. Not very impressive, but whatever...

Also, I'll call Hansgrohe on Monday.

For the time being, here's the trim and rough in valve:

TRIM: http://www.hansgrohe-usa.com/suche.htm?searchtext=15752
ROUGH-IN BOX: http://www.hansgrohe-usa.com/article...-01850181.html
could be he doesnt know..lol..
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Old 02-14-2016, 10:40 AM   #8
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ok in the installation instructions it states this is a thermostatic mixer..but on the trim link it gives you the choice of thermostatic cartridge or pressure balanced cartridge, can you open your trim box and see what the cartridge is labeled?
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Old 02-14-2016, 07:54 PM   #9
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Ok I found that both the rough-in box and trim are ASME A112.18.1, CSA B125.1, and ADA compliant. Are there any other standards that he could have been referring to? He seemed especially concerned with whatever standard is associated with scald protection.
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Old 02-14-2016, 09:04 PM   #10
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Quote:
Originally Posted by bajafx4 View Post
Ok I found that both the rough-in box and trim are ASME A112.18.1, CSA B125.1, and ADA compliant. Are there any other standards that he could have been referring to? He seemed especially concerned with whatever standard is associated with scald protection.
Then your good keep that for your inspector.
Make sure you read over how to adjust the temperature, It should be set between 110-120 at the top end.
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