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Gas hot water does not increase temperature when turned to HOT

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 659 Answers

SOURCE: INSTANT HOT WATER ISN'T HOT ENOUGH.

http://homeappliance.manualsonline.com/manuals/mfg/rinnai_corp/reuva3237ffu.html

http://www.houseneeds.com/shop/HeatingProducts/RoomHeaters/rinnai/rinnaimanuals.asp

Here are two links to get the manual for your unit. Since I don't have the model number for your unit, you can find this in one of the two links. If you have the manual, you will know if you are skipping a step or not. If you have done everything, then I would call Rinnai to find an authorized tech for your appliance. Hope this helps.

Posted on Mar 21, 2009

  • 152 Answers

SOURCE: No hot water

The code # 11 is a code that warns of "no ignition" and the causes of this error code are too many to list. I would suggest that a qualified tech. perform a diagnostic test and repair.

This is not a task for the "do it yourselfer"

Posted on Mar 25, 2009

gary1121
  • 332 Answers

SOURCE: how do you change the temperature of a vulcan hot

which ever one has the temp on it would be the one,, is it gas? or electric? if gas it would be on the gas valve ,, if electric it will be under the cover where the elements are

Posted on Jun 08, 2009

  • 115 Answers

SOURCE: Rheem Gas Hot water Heater; Model 21130DV:

yes, sounds like the temp control is bad, you should be able to google model# and thermostat to find replacement. should be fairly easy to swap out

Posted on Aug 19, 2009

  • 4 Answers

SOURCE: I have a problem with my Rinnai hot water heater

We had the same problem - the hot water would only be hot for 3 -5 minutes and shut off, then we had to turn the water off, wait a few minutes, and do it again. VERY FRUSTRATING.

Solution: The Rinnai serviceman showed me the heat-exchanger blower/fan: It was clogged with dust and moths.

Another clue: Our Rinnai was extremely noisy when the heat came on. After the fan was cleaned and replaced, it is nearly silent.

If you are reasonably mechanically inclined:
TURN THE BREAKER / POWER OFF to the unit.

The blower-fan is located in the lower central area of the unit (at least on our unit). If you draw imaginary north-south, east-west lines through the center of the unit, the fan is in the lower-left quadrant. There is a spring clamp securing the black rubber accordian-like tube to the fan. There are two screws that secure the fan to the unit. there are two plugs that connect to the fan, as well as a third air-flow sensor that should be removed. then you can look at the fan unit, as well as the grill on the underside of the heat-exchanger that should be cleaned.

My thought was to go out and get a simple bug-screen, and place it over the air-input outlet vent going outside, but the repair guy said that although it may sound good, if that screen ever gets clogged, or reduces airflow to the Rinnai, then the unit will work harder, or even shut off, giving the same problem.

Posted on May 24, 2010

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1 Answer

Water heater


Most instant-on tankless water heaters require at least 10 psi of water pressure to start the heating process. The flow of water determines how hot the water will be, within the heating range. An electric 110 volts heater will increase the water temperature about 25 degrees F. A gas water heater will increase the water temperature about 45 degrees F.
Too much flow will not allow the water time to heat. Too little flow will not allow the heating system to work. Each heater must have the outflow water flow adjusted for the best heating outcomes. The best way to find the ideal flow is to turn the hot water facet on and adjust it (open or close) until the water reaches the balance of producing hot water.

Apr 25, 2016 | Water Water Heaters

1 Answer

How do you increase the water temp?


Hi Donna:
The temperature is pre-set and is intended to be not too hot to inadvertently burn someone. Increasing the setting can cause a real SAFETY HAZARD, especially if small children or seniors are involved.
With that in mind, there will be a panel that unscrews from the side of the heater. After removing it, lift the insulation back and a dial should be visible. There will be numbers, and a pointer with a screw slot in the centre. Turning the pointer to a higher number will increase the temperature.
If you are going to adjust it, only do so a very small amount at one time, until you reach the desired temperature.
Remember, increasing the temperature will not give you more hot water, it will only give you hotter water. If you need more hot water, consider getting a larger tank or an "on demand" gas fired unit.
STAY SAFE!

Jan 12, 2016 | Water Water Heaters

2 Answers

Rheem 71 30d


You should be able to control hot water temperature by adjusting the thermostats. Either or both may have failed, causing heating to increase to the maximum. The "spitting" is caused by boiling water. Likewise, the pressure relief valve is operating as it should resulting in the overflow you observe. You need to get your heater serviced immediately!!

Oct 10, 2013 | Rheem Tankless Hot Water Heater...

1 Answer

Rheem 21vp40 1


Copy following links to identify type of thermostat, and see how to adjust temperature on that specific thermostat, and see other ways to increase amount of hot water
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
http://waterheatertimer.org/Increase-amount-of-hot-water.html
Add a comment and describe if water heater is gas or electric, and add what other problems you are experiencing.

Jul 14, 2013 | Water Heaters

1 Answer

My gas bill has been going up each month but I have not been increasing the use of hot water. I have turned down the temperature control to the lowest setting (vacation) but the water is still very hot -...


Replace gas control valve.
The gas valve is the thermostat.

Vacation setting should be 50 degrees, or so, depending on exact gas control valve.
If gas water heater is not responding to temperature setting, then thermostat is suspect.

Open following link to help identify tank-type gas valve.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html
Each gas valve should have identifying number on side.

Instructions how to replace typical gas control:
http://waterheatertimer.org/pdf/White-rodgers-gas-vale-replacement.pdf
http://waterheatertimer.org/pdf/How-to-replace-gas-control.pdf

Additional resources with service manuals:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot

Add a comment for more help.

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Sep 13, 2011 | Rheem 30 Gallon FVR NATGAS Water Heater...

2 Answers

My family is moving in...how do i increase hot water availability?


large water heater, turn p the themo stat to a higher setting ( watch for burns with young childern and older folks)

or the best install a tempering valve. this valve mixs hot water with cold water before it goes into the building.

Again if you have young ones or old people they can burn faster than any other group.the best is a larger heater for the DIY person.

Thanks Tom

Sep 13, 2011 | Rheem Water Heaters

1 Answer

I have an Atwood GGA-8E about 6 months old was getting hot water but now the water is only luke warm, any adjustments?


There should be a temperature setting on the gas valve. It should be on top or front and have several settings normally vacation, warm and hot. Rotate dial towards hot setting to increase water temperature. Hope this helps. Thanks

Nov 17, 2010 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Water temperature not hot enough


Biggest problem with this is the LP piping and gas pressure. It needs a higher gas pressure than the regulator is factory set for. Have your gas company or licensed plumber increase the pressure and check the flow (with all gas appliances on). Bring it up to 11 inches of water column with everything on. This will usually fix the problem.

Apr 02, 2010 | Bosch & Tankless LP Hot Water Heater

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