Temperature drop in shower water. Big mystery!

Hello,

I do not understand what you mean by "Manschette" regarding fittings.
What kind of hot water supply do you have?
Do you have a solar system for hot water supply?
Have you installed a pre-mixing/scald protection valve?

Please provide more information about the system.

Regards Almi

Hello Almi,

we have a solar-supported hot water preparation system. For this, we installed a 400-liter water tank. The company Wolf explained to me by phone that the hot water only comes from one pipe, at the very top of the tank. Therefore, the argument is that if it were due to the hot water preparation, all tapping points would have to be affected. As I said, however, only one shower is affected, while the temperature remains stable at the other.
By "cuff" I mean the metal ring that is attached at the point where the hot water comes out of the wall. We have an exposed thermostatic battery, meaning that on the left you can set whether the water comes from the overhead or the hand shower, and on the right is the temperature control. This can be locked at 38 degrees. This is stated in the product description:

Hansgrohe Raindance Showerpipe consisting of:

Thermostat AP with on/off/diverter valve,
Raindance AIR overhead shower Ø 24.0 cm with Rubit anticalc system,
Raindance S100 AIR 3jet hand shower with Isiflex 160 cm shower hose
and height-adjustable shower holder.

Suitable for instantaneous water heaters if the flow pressure before the fitting is at least 0.15 MPa.

I would be very grateful for any tip on what it could be!

Best regards

Katharina

Hello Katharina,     

I am from the service team of Hansgrohe AG and found your question here.

From the way you describe it, it seems that in this bathroom, or on this pipeline, a check valve is defective, causing cold water to be pushed into the hot water line or vice versa. In the shower, it could be because dirt has possibly been flushed into the check valve. My tip: simply check the check valve and verify its function.

If there are still problems, just give me a call at 07836511282.

Best regards,

Günther
 
Hansgrohe-Service

Hello everyone,

Mr. Schmidt's tip is not bad, but personally I would opt for the latter.

First of all, I would check whether a cross-sectional constriction (Wasserspardichtung) has been installed between the shower hose and hand shower/head, and then remove it as a test.

It is also possible that the temperature preset on the fitting is not set correctly.

Furthermore, it could be that a possibly existing premixing valve (scald protection due to solar heating) is defective or does not work properly with the thermostat in the shower fitting.

Maybe Mr. Schmidt can say something about it again, he certainly knows more about the fittings.

Remote diagnoses are quite something

Best regards, Almi

Hello you two, thank you very much for the answers. I just got home from work and will now follow your advice. Let's see what happens. I'll get back to you! I have the faint hope that it can be brought under control... Best regards Katharina

Hello Katharina, hello Almi

I do not think that it is due to water-saving devices or the narrowing of the cross-section. I also exclude the temperature presetting and the premixing valve, because the described problem involves different fittings with different mixing systems.

Checking the check valves is not a big effort and can be done quickly with a few simple steps.

If there are problems with the check valves, just call, because then it would be necessary to find out whether it is a surface-mounted thermostat or a built-in thermostat.

Best regards,

Günther
Hansgrohe-Service