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Shower not hot

How can I increase the temperature to which the shower valve allows the shower to run hot watter. The tap water in the basins is hot, and the showers in all other bathrooms run pleasantly hot. But in on bathroom, even when turned fully to hot, the shower water is not adequately hot. The shower plate is a Grohe Europlus II

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There is a handle limit stop under the handle. Remove the handle with an allen wrench and you should see a plastic piece with a tab on it fit into the assembly. Remove it and rotate it slightly to allow more travel in the handle and reinsert. You will have to test it to see if it allows enough hot water to mix in. If it is still not warm enough repeat as needed. Once you have the water at a comfortable temperature reinstall the handle and enjoy.

Posted on Dec 31, 2008

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1 Answer

Water temperature has reduced even on maximum setting


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I turned off main tap on meter, Undid tap fitting on shower found the washer was worn but also the tap fitting was seized could not turn it for full movement. You could soak the tap screw fitting in CLR and pull apart and use a tap grease on the screw thread or just buy another tap fitting. I discovered most of my tap fittings had calcium build up in them. But I replaced the shower tap valve thingy as it was really seized up.

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I have a hudson reed Twin Concealed Thermostatic Shower Valve. It was working fine for a couple of years. My brother used the shower and adjusted the water temperature valve but since then the water has...


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    If inlet water temperature is over 70°F due to geographic location, water maybe very hot out of the tap. This requires a lot of cold water to be added with it in order to attain a useable hot water temperature. The addition of too much cold water will overpower hot water demand from the tankless water heater. This slows the flow within the tankless water heater, decreasing it below activation point, which shuts off the heater. The end result is nothing but cold water coming out of the outlet. See: TWH E2-04 Overcoming fluctuating temperatures [PDF].
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    If the water pressure in the home is erratic and the water flow is not consistent while a tap is opened, then the temperature of hot water will fluctuate. The minimum water pressure for the home should be 30psi or greater. For people on well systems the minimum pressure range is 30-50psi. The use of a pressure reducing/regulating valve is an effective way to maintain constant water pressure to the water heater. Watts brand 25AUB- ¾" or N35B-¾" pressure reducing/regulating valves or equivalent is suggested.
  3. CHANGING FLOW RATE
    Major changes in flow rate can adversely affect the output water temperature of the heater. Increases from one major fixture running to multiple fixtures running at one time can cause the temperature to fluctuate. Stay within the heater's specifications. See: TWH E2-03 Outlet temperature vs. flow rate [PDF].
From the Bosch website.

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