Grohe Grotherm thermostatic valve for shower

14 years ago

Does anyone have this CORRECTLY installed in a shower? I'm looking for a good, closeup photo to show the contractor's plumber, who has tried twice but been unable to figure out how to do this properly. In particular, there are two white rings that rotate, one plain and one with the temperatures marked on it. He has them together, but we have the impression the smaller one (without the temperature markings) is supposed to be installed AT the wall, not right with the temperature ring. In addition, although he came back to rotate the collar with the "notch" on it to the top (he'd installed it with the notch on the bottom, so you couldn't see it), the volume handle is set so you cannot even GET to the lower temperature markings. (I'll try to post a photo, but am really looking for a GOOD photo of this valve properly installed -- we have Somerset trim.)

Thanks for any help -- this guy has clearly never seen one of these before! We gave him the installation instructions, but the "explosion" diagram is kind of small and I think he needs to see what it's supposed to look like when it's complete.) I'm also having trouble explaining in plain England the concept ... that you are supposed to be able to SET a temperature, whether it's 110Â° or 80Â° and the water that comes out is supposed to BE that temperature. He is clearly working on a standard pressure valve mindset -- he seems content that if the handle moves one way, the water gets hotter, if you move it the other way, the water gets colder.

(Posting to Bath forum, too)

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ctlady_gw
Original Author
14 years ago
Here are images of our weird installation.

This is in the maximum "hot" position (as far as the lever will go).

And this is an image with the handle in the maximum "cold" position.

Here is a picture of the two white rings ... we think the narrower one is supposed to be installed in the wall, on the other side of the trim plate. Is this correct?

As it is now, we can get very hot or warm water, no cold. The lever can be moved about a quarter way around altogether (the first two images illustrate the maximum movement of the lever). He measured the water temperature when he "fixed" the stainless sleeve (the notch was originally on the bottom instead of the top and we KNEW that was wrong); he adjusted the green nut so the water was 100 degrees when the ring was on the numbers "100" ... but I assume the position of the lever itself matters as well (and must have to be adjusted relative to the numbers on the white band since why else are they there?), since as it is, you can't even MOVE the lever to the lower numbers.

HELP!!!! Am I not understanding something here? I have to be able to explain in REALLY simple words to this guy what this should look like and how it should function. He thinks it's just fine and clearly didn't really understand why the notch (by which you determine where you align the temperature number) had to be on top -- where it could be seen. I had the sense he felt he was humoring me by moving it :)
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Grohe Grotherm thermostatic valve for shower

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ctlady_gw
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Grohe Grotherm thermostatic valve for shower

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ctlady_gwOriginal Author

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ctlady_gw
Original Author