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The shower is too hote. My minimum adjustement of the temperature is at 70. which is too high for summer. It is possible to lower it down?

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  • snap101
    snap101 May 11, 2010

    what kind of heater is it? model and serial number

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  • 154 Answers

May need temp sensor

Posted on Aug 03, 2009

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Wickes 102 combi boiler constantly loosing water pressure


It sounds like your thermostat could be the problem. Have you noticed the boiler cutting off at all, or does it run continuously until it goes out on low water?

You stated, "when boiler is on", so I am wondering how you get the boiler on. If your boiler is controlled by a thermostat, you need to check it for a cold draft possibly from behind the thermostat in the wall where the wires come through. The thermostat should never be on an outside wall. The thermostat could be defective.

An aquastat can also control your boiler. If you have an aquastat, check the setting, typically 175 - 180 degrees. You should also have a "high limit" which should be set at 210 - 220. Some people run that high side limit higher; not a good idea - defeats the purpose. If the aquastat is set too high, the boiler will operate too hot and the problem you have will occur.

"pressure rises and pressure relief valve opens" This could mean that your pressure switch is prematurely venting. Check boiler temperature to see exactly at what temperature the T&P valve purges. If it blows off below the high side setting, either adjust or replace. The T&P valves are usually not adjustable. That blow off temperature is stamped on the head of the valve. So, if it discharges too soon, replace it.

Have you actually seen evidence thgat the T&P valve is opening? You may have a bad bladder in your expansion tank and your system may have air in it. Your boiler should have 12 psi when cold and 20 - 22 psi when operating. Check your boiler pressure guage.

"
this eventually drops below the minimum operating pressure" Technically, there is set point for a NO MINIMUM OPERATING PRESSURE. That is a function of the amount of water in the boiler. If the T&P is blowing off, it will vent water from the boiler and the boiler pressure will go down. There is a minimum operating TEMPERATURE.

Your boiler could be low on water. You will have to manually fill the boiler. Be careful of thermal shock to the boiler. Feel the piping, and fill only when the circulator is running. Make sure the water is not going directly into the boiler. The supply water should go into the circulating supply side which feeds the radiators, radiant floor, or base board circuits.

All this will adversely affect your hot water. The heat exchanger for the potable hot water may have scale build up in it. Using the hot water keeps the boiler running, and a scaled heat exchanger will give you cooler hot water and the boiler keeps running. If this is a problem, you will need to replace the heat exchanger. A better idea is to not use the boiler for your domestic hot water. Why run the boiler in the summer?

Feb 02, 2013 | Water Heaters

1 Answer

Hot water tank does not work when shower is on, it does however work when the faucet in bathroom is on. It quit working in the shower about a month ago.


  1. 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].
  2. 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.
  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.

Good Luck,
Gary

Dec 16, 2010 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

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
2) Widden flow restrictor - most shower heads have a flow restrictor on the back of the showerhead; It consists of a rubber washer with a hole in the center. You can widen the hole using a drill bit.
3) remove the flow restrictor - this should be a last resort

Jul 22, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Water is hot until you adjust the shower temperature to warm from hot, then heat unit shuts off and it is 100% cold. Shower head is low flow so wonder if the flow is below minimum for heater to fire?? Can...


These unit is design to operate at a specific flow rate and cannot be ajusted if you need to have a warm shower you will need to get a bath remote where you can turn down the temp whenever you need without disrupting the flow rate

Jul 21, 2010 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Shower water either too hot or too cold can't adjust to suitable temperature in summer.


Turn your water heater down. There is knob on it that controls temperature. Only turn it little bit at a time until you are comfortable with the temperature at fixtures.

Mar 18, 2010 | Bosch Water Heaters

1 Answer

My paloma tankless water heater will shut off in the middle of a shower


I am not sure if this is it but I had mine at too high of a temperature therefore I was not using enough volume of hot water to keep the heater on. They have a minimum amount of flowrate to sustain. Try turning the water temp down to 125-130. Hope this helps

Jan 27, 2010 | Rheem Paloma Tankless Water Heaters...

1 Answer

The temperature in my shower is very luke warm only at the shower


Do you mean the other faucets in the house are hot and only the shower is warm? If so there is an anti-scald adjustment on the faucet that needs to be turned up a few notches. Havent adjusted a Grohe faucet but most faucets you rmove the handle and behind the handle is a nothced adjustment ring that prevents the faucet from getting too hot. This ring, or stop, is pulled out and twisted clockwise(or counter clockwise to set higher or lower max temp, then pushed back. maybe you can look up grohe to see which way ring or stop adjusts for hotter water.

Jan 23, 2010 | Grohe Integrated 1/2'' Shower Thermostatic...

1 Answer

When i turn on the cold water to adjust the temperature of water - the hot water turns completly off. I cannot turn on the cold water at all. It is either all hot water or all cold.


It might be a question of inadequate flow. All tankless water heaters have a minimum flow rate that must be met, typically .5-.9 gpm, before the heater will operate. In the summer time the incoming ground water temperature is higher, causing you to mix more cold water and less hot water to get a lukewarm temperature. This can reduce your flow rate near or below the minimum flow rate.
Here's a test for you, try running running a sink while taking your next shower. If the hot water remains mostly constant throughout, then your problem is with flow at the showerhead. The flow at a shower head can be reduced by buildup of scale and sediment. Also all showerheads have a flow restrictor that limits flow to 2.5gpm (some even less). Removing the restrictor will increase the showerhead flow rate as well.
Also look for any error code displayed on the digital read out of the heater. Some heaters will flash on their burner indicate light as well.

Aug 17, 2009 | Water Heaters

2 Answers

The hot water shuts off during a shower. All the


One of the problems with these has been that you must be using at least 1/2 gallon per minute for the burners to ignite. In the summer when the incoming water is already warm, we tend to not use enough hot water to keep it lit. Try turning on the hot water faucet in the sink and 'wasting' some hot water during the shower. If that fixes the problem you can find some other adjustments on the Aquastar website to help lower the temp some.

Jul 04, 2009 | Bosch AquaStar 2400ES-NG

1 Answer

Water temperature varies while useing the hot water during a normal shower. jg


Try this before replacing the shower diverter valve.

If this problem is isolated to the shower only, then I would suggest that the shower diverter valve is equipped with an "Anti-scald" safety feature that can not be adjusted, however the temperature regulator/thermostat on the water heater can be adjusted to a lower temperature so as to not activate the the "Anti-scald".

Feb 20, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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