Question about Grohe Grohmix Thermostat Valve & Trim - 34436

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My contractor installed a 4 port diverter. The hot and cold are ok, but when I turn the shower on, the flow starts in the hand held shower head and not the main shower head. According to Grohe, whichever pipe is installed from the bottom port, this will be the main flow. Would you agree the contractor installed the pipes incorrectly? If so, do you know of any instructions that the contractor could have followed to install this correctly? Thanks KKae

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I haven't had a lot of experience with Grohe brand but have had twenty eight years as plumber, 22 years as master plumber and the bottom port of every tub or tub/shower valve that I installed used the bottom as main supply port. As far as the instructions from manufacture like I said I have not used that particular brand much,so I really couldn't say. Hope this helps some. Thanks

Posted on Nov 10, 2010

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1 Answer

My Marey tankless water heater will not ignite for the shower, but will forthe faucets. Have changed batteries, cleaned the filter and had the showerhead cleaned. Local plumbers will not do...


Most on demand or tank-less units require a minimum flow rate before the unit will fire up, they designed them that way so small water leaks (drips etc.,) keeps the unit from going on needless;y. Try opening the shower hot water fully and see if it comes on, If it does, try closing it slowly to see where it shuts off. Make sure your shower head is clean and not blocked with calcium, which will restrict the water flow. You could also try changing the shower head to one that allows more gallons per hour flow rate. Also make sure the cold inlet and hot outlet valves on the unit are fully open and the diverter on the shower is fully open as well.

Mar 24, 2015 | Water Water Heaters

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Hot water varies


I do not know how old this unit is or what model but many water heaters are not sophisticated enough to measure the temperature, but heat based on water flow and temperature rise. To start, tankless water heaters turn off every time you turn the hot water off. Lets use an example. You use the facilities, wash your hands then turned off the water and take a shower. You will bring the already heated water (from washing your hands) from the pipe up to the shower. Then the cold water that comes into the pipe from the reactivation of the water heater comes up the hot water pipe with warm then hot water just behind.

If this is not your problem, keep reading. Every unit I have been called to see were installed wrong. Check your installation manual to see if the problem with the system started with the contractor.

First, check the temperature of the water from the heater. If it is too hot and you are mixing too much cold water in, the unit will turn off because there is not enough water flow to keep it running.

Second, turn off the valve at the water heater and turn on the hot water at a faucet. If the water does not stop running, there is a "plumbing cross over" usually caused by a failing pressure balance valve in a shower.

Third, if the unit has not been serviced, go to bosch-climate.us to find a tankless water heating professional in your area. Totally Tankless LLC

Mar 14, 2014 | Bosch & Tankless LP Hot Water Heater

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Changes in amount of water flow from shower head


when he soldered the connections on these pipes.. he may have partially blocked the flow with solder inside..if its restricted up to 50% then its a hell of a pressure loss..hot water is always lower in pressure anyway..also take the shower head and dunk in a clr solution it may have calcium deposits inside the small plastic orafices in it..

Jan 12, 2014 | Water Heaters

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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,
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Apr 10, 2011 | Stiebel Eltron DHC-E 8 Tankless Electric...

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How do you fix hot water shuts off during shower with Model N-069M-OD installed December 2006?


Try flowing more hot water with your shower. During the summer you end up mixing alot of cold water and very little hot water (because your cold ground water isn't so cold in the summer). When you get close the minimum flow rate of the appliance, it will start to short cycle (fire on and off). Here's some recommended things you can do:

1) Clean the shower head - remove scale deposits and or clogging
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Water turns cold very quickly


I had the EXACT same problem (installed my tankless last winter and worked fine, now this summer it fluctuates, have to turn the shower completely off and then on again to get any hot water and then it only lasts for a couple of minutes!) Argh - it is frustrating!

Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)

Jul 06, 2010 | Bosch & Tankless LP Hot Water Heater

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I have a newly installed Bosch hot water heater. After installing, it seemed to be working fine. It is in a small weekly rental unit. If anything, the unit is over-sized for the demand. Now that it is...


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1 Answer

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1 Answer

I'd like to install 1 shower had and one hand held shower. What do I need to have ?


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I have a triton opal shower.

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