Question about Grohe Grohmix Thermostat Valve & Trim - 34436

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Grohe thermostat valve - hot water is set too high

I would like to adjust them temperature control to allow for more cold water. I do not know much about plumbing and I cannot figure out how to carefully remove the knob and coverplate. Once I do that, I have no idea what I will find behind there or how to make the adjustment. Help

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Hi, do you have a manual or a model number?

Posted on Jun 29, 2010

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Could my grohe thermostatic shower be letting cold water into my system? Some other taps run cool but the shower is running OK temperature


If you have single handle facute one bad cartridge in the system may be acting like a mixing valve and allowing cold water to mix with hot not allowing water to get hot enough .

Mar 10, 2015 | Grohe Water Heaters

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How do I adjust water temperature after valve has been installed


Don,

there be should be a knob (typically red in color) on the front of your water heater, with temperature degrees listed. The knob should also delineate a typical range of settings for domestic use, which range from 120 degrees to 160 degrees. While a hotter setting will allow an increased amount of warm water, for example for longer shower duration, these temperatures can present a risk of scalding and require more energy to maintain the selected temperature.

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Nov 02, 2014 | Grohe Grohtherm Thermostatic Rough-In...

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Hot water is not


Which type and brand water heater do you have?
Is the water hot at the water heater?
You might have plumbing problem with crossover.
http://waterheatertimer.org/Crossover.html

Aug 17, 2012 | Water Heaters

1 Answer

How do i install a pressure tank to my water heater?


Do you mean expansion tank? To relieve pressure?
Expansion tank goes on cold water line before cold enters tank.
See image:
http://waterheatertimer.org/images/water-heater-expansion-tank.jpg

Expansion tanks are installed when TP valve is constantly drizzling hot water due to very hot temperature settings. Or when water pressure is high, etc
It's also smart to install expansion tank so plumbing lasts longer, and older tank is less likely to rupture and cause damage. Inspect tank for leaks each 6 months.
Some regions require expansion tank by local code.
Water heater can be damaged when pressure exceeds 80psi. : Test pressure using pressure gauge at water heater drain valve.

Other resources:
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html
http://waterheatertimer.org/images/BTG-100-Pressure-gauge.jpg

Sep 27, 2011 | General Electric Water Heaters

1 Answer

I installed a dhc tankless heater, but when I open only the hot water everything is ok, but when I open the cold water at the same time the heater turns off.


Hi and welcome to FixYa, I am Kelly.

What is happening is that your cold water flow is greater in volume (gals per min) than your hot water. So when you open the cold water it is mixing with the hot water inside the faucett or shower plumbing and actually reverse flowing back into the hot water heater plumbing. The reverse flow slows the water flow sensing turbine inside the heater and it is thinking that there is not any water flow. (There isn't actually due to the equalization of water pressure when you open the cold water faucett) Since this is a safety feature of the tankless heater to keep it from overheating, it shuts off.
Somewhere in the hot water plumbing there is a major restriction. It may very well be the internal plumbing of the tankless hot water heater or the flow detector design.

There are 2 ways to correct this. The easy way would be to restrict the available cold water flow. You can do this by installing another shut off valve inline with the cold water plumbing and just not open the valve all the way. You would have to adjust the setting so that the hot and cold water can be on at the same time and the hot water heater stays on. The hard way is to locate the hot water flow restriction and eliminate it.
It is possible.... if you have a flow restrictor in a shower head or a screen in a faucett areator that they are partially clogged. Clean any flow restrictors and screens then see how the hot water heater performs before you start modifying plumbing.

Thanks for choosing FixYa,
Kelly

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Relief valve on my water heater is dripping.Can I fix this?


There are two solutions:

1) Replace TP valve with same temperature/pressure as existing TP valve.
Buy the TP valve at hardware store or home center or plumbing supply.
Turn off water heater so water cools.
Hot water inside a tank is explosive ... so open the TP valve and test water temperature.
If TP is on top of tank, you don't need to drain much water before unscrewing
If TP is on side of tank, use the TP valve to drain water -or- use the drain valve
Unscrew TP to remove.
Put teflon tape on new valve threads so it will seal against leak.

2) If the new TP replacement starts doing the same thing, there may be a thermostat problem -or- thermostat is set too high.
If you keep the water temperature set high, you can add expansion tank to incoming cold water line.
Home Depot sells expansion tanks. Plumbing supply carries them,
The tank for residential water heaters is about same diameter as a football and it goes on cold water line.
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Oct 31, 2010 | Water Heaters

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We have a Reliance 501 Electric Water Heater. We get only very hot water in bathtub in one bathroom but not the other bathroom. Could the problem be the water heater?


No, the problem is not in the water heater. It could be the plumbing pipes were installed incorrectly.

A common problem with hot water is also found in the settings of anti-scald and pressure balance tub and/shower valves. You may only need to reset the temperature control on each faucet. Every faucet brand has a slightly different adjusting system. Hopefully you can find the faucet's brand name, and then visit their website to find the owner's instruction manual for your model.

A cross connection in the water piping system is rare, but it does happen from time to time. It would allow cold water to mix with the hot. You would need a plumber or leak detection company to locate every water pipe connection in and/or under your home to confirm and correct the issue.

Sep 05, 2010 | RELIANCE ELECTRIC WATER HEATER

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Install trim and adjust the thermostat on a Grohe shower faucet


Before you install the temperature control knob, adjust the valve body (47111) with a wrench to set the temperature to "100 degree or close to it". Now, place the limit ring to tdc (top dead center) and control knob with the red 100-degree align to it. Your problem may have been the valve's temperature setting is out range when you installing the temperature control knob.

Jun 28, 2010 | Grohe Grohmix Thermostat Valve & Trim -...

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