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
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.
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check tap had a shower myself that would start hot then 3 minutes later hot was cold! then hot after 5 minutes.
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.
the problem is the hot/cold mix is set wrong ---
remove the water control handle to expose the mix valve -- you should see a small set screw that will either increase or decrease the travel of the hot water valve. --- sometimes instead of a set screw there is a little pop off plastic set ring,, pop off and set to a more advanced travel.
this will increase the amount of hot water that flows to the shower head and the bath tap.
COLD MIX, HEATER DEACTIVATES 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].
FLUCTUATING WATER PRESSURE 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.
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].
Remove the handle by loosening the screw near the bottom. You should see a plastic ring, probably green, that is the hot water safety. Adjust it so that the handle will turn further for more hot water. It most likely pulls out, then turn it left, reinsert and reattach the handle.
Hello, first if any water supply hot or cold is turned off, you will experience trickling as you mention. You must have both cold and hot in order to adjust the temperature on your valve. if you had a plumber intall this unit you should ask him to adjust it. Otherwise here is how:
Rotate the handle counterclockwise to stop and let water run till cold water is purged, check
temperature. Rotate handle to off, remove handle parts (see Disassembly in your manual) and temperature limit stop, rotate clockwise to decrease and counterclockwise to increase maximum hot water temperature, reinstall temperature limit stop and handle (TIP: Do not screw handle in until desired maximum temperature is achieved) Repeat steps until desired maximum
temperature is achieved
If you are having trouble only at the one fixture (shower), and no where else, the problem is most likely in the shower valve...which either needs new cartridges, or a complete replacement.
hope this helps