Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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How do you sdjust dip switches on an ECO200PV for 125 degree water?

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  • lv2dive Jul 29, 2009

    I agree with you concept.

    In this situation I am only getting 110 degrees F at the Kitchen sink and 108 at the closest Shower. I currently have it set to 120 max and cannot go higher without setting the dip switches.

    Can yo help with the dip switches?

  • lv2dive Jul 29, 2009

    Home Depot $999.99
    Install Kit $189.99

    Water is 120 at water heater. Tested water at basement sink 5 feet from heater.

    I found the sequence to enable 125-140F:

    1.) Power Off Heater from Controller (Leave plugged in)
    2.) Turn Off Gas & Water to Heater
    3.) Switch dip #4 to OFF
    4.) Press and hold SW2(Blue Button Switch) for about a second. (LED should be lit solid)
    5.) Switch dip #4 back to ON
    6.) Turn ON Gas & Water to Heater
    7.) Power ON Heater from Controller



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Why so hot? one thing i have noticed when i install tankless is we are soo used to making hotter water then we need then cooling it down to what we like, set your tankless so when you jump in the shower or do the dishes that you only turn on hot water only. then your not wasting energy to heat water you are just cooling down. then your just heating water to what it needs to be. you will use less energy and get more out put out of your tankless

Posted on Jul 29, 2009

  • snap101
    snap101 Jul 29, 2009

    did you buy it from home depot or lowes?



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I need to reset my mini therm. The wwsd light is on and the water will not heat up more than 140. I need to operate it less the outside controle.

It's possible your outdoor sensor is defective. Part number E2347400. In theory, the WWSD LED flashes for outdoor sensor errors. It's intended to limit the system heat output when the outdoor temp exceeds 70F.

According to the Laars Mini-therm manual for models JVS and JVH, you can use DIP switch setting 3 to modify how the boiler works with the Warm Weather Shut Down (WWSD) outdoor sensor. If you turn off number 3, it inactivates the 70-degree WWSD. This should have no effect upon a call for domestic hot water, but may allow a call for space heat to be processed at the min setpoint of 150, if not the higher calculated setpoint.

The control access panel requires tools to remove the cover, to find the DIP switches, meaning it is not ordinarily intended for use by untrained operators.

Call a repairman to verify what you should be doing to bypass a malfunction temporarily, until they can get to you.

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ER3 error code on amtrol hot water tank

Simply means hot water heater called for heat for 1 hour and never rose in temperature or reach stepping, unit automatically goes into lockout. I would reset power

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2 Answers

Water only stays hot for about 5 min or

Gas or electric?
Electric water heater ... then test for crossover, check for water leak, replace thermostats, test elements
Gas water heater ... test for crossover, check for water leak

water leak: turn off all taps and put ear against pipe and listen for water leak... check if water meter advances when all water taps are off.


If you need further help, I’m available over the phone at

Oct 09, 2014 | Water Heaters

1 Answer

I have a GE Profile Water Heater Model #SE40M12AA01.

I recommend safety changes to prevent ruptured water heater and assorted leaks.
135 degree hot water.
Maybe replace TP valve if it is dripping.
Drip pan under water heater with 3/4" drain line to outside.
Expansion tank on incoming cold water line to absorb pressure build-up, and prolong life of tank and plumbing.

Here's why:

1) Yes you can have scalding hot water.

2) I recommend 135 degrees since that will burn the evil right out of ya. And generally kill clothes washing bacteria.

3) 150 is dangerous and can seriously burn skin in 1.5 seconds. Not safe around children and elderly.

4) Temperature settings on electric water heater are approximate, since thermostats are calibrated approximately, and read temperature through tank wall.

5) Also if you want to increase amount of hot water for high-consumption household, then setting tank temperature upward is one solution since more cold water is mixed with hot, so amount of hot inside tank goes further.

6) High temperature can cause TP valve to release water.
TP valve is pressure-temperature safety valve. Do NOT cap off.
Rating should be 125 psi and 180 degrees ... but all things water heater are approximate, and TP valves need replacement now and then.
It is not recommended by water heater manufactures to use 150 psi TP valve when water heater came with 125 psi. Rating shows in small print on end of TP. New TP valves sold at local hardware. Let tank cool before installing new one.

7) Higher temperature and high pressure can rupture tank.
Pressure over 80 psi shortens life of water heaters and plumbing fixtures. Put BTG100 pressure gauge on water heater drain valve to check pressure.

8) You need a drip pan with 3/4" drain line to outdoors, or to drain vent line, to prevent flood caused by ruptured water heater.
Turn water heater off when going on vacation.
Inspect water heater each 6 months.
Drip pan available at local home center or hardware:

9) Heated water expands and puts pressure on tank and pipes.
Water does not compress... so when water gets hotter it expands against tank wall and against pipes.
Especially in closed system (check valve present) when system is without expansion tank.
Expansion tank is installed on incoming cold water line.

If you need further help, I’m available over the phone at

Oct 31, 2012 | Water Heaters

1 Answer

Raise temp above 120

Raising temperature above 120 degrees requires service call.
Or change dip switch settings and risk voiding warranty and causing service call expense.

Earliest versions of Rheem tankless 2006-8 let you set temperature up to 140 degrees F using remote.
However the hotter setting caused error codes because the burner cannot keep up with both high temperature and large volume of hot water rushing through pipe. Especially in winter with cooler incoming water that must be heated more to reach temperature set point.
The burner simply cannot keep up.
So Rheem changed maximum temperature at remote control to tepid 120 degrees, which is not hot enough for folks wanting hot shower, or folks filling whirlpool tub because water in tub cools before tub fills.

If you need further help, I’m available over the phone at

Oct 27, 2012 | Rheem Tankless Water Heater Main Remote...

1 Answer

How do i raise the temperature from 120 degrees to 125 degrees

You need to use a remote control to raise the temperature from 120 to 125. The part number is N-7649M.

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1 Answer

My rheem water heater doesn't seem to be heating the water. I have a Rheem model 81SV40D and the water is not hot and doesn't seem to get hot. I have checked the dials on the water heater and they are set...

try setting the bottom 10 degrees hoter than the top could be in short cycle (thatis the bottom calls for heat on the bottom element and set too close so goes back to top and cycles off

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1 Answer

Only heats water to 1oo degrees and temp on remote is set at 140 ?

I just changed mine today with help from Rheem support as the manual had a typo error.

You should be able to increse to 120 max as default. However if you want to change to 140, you will have to perform the following as detailed in the manual ...

- Turn off the power.
- Remove the cover.
- There is a dip switch on the controller board. Flip dip switch #4 to "ON". Your remotw will start flashing.
- Press SW2 on the controller board for at lease a couple of seconds (The manual states SW1 which is incorrect)
- Flip dip swich #4 back to "OFF"
- close cover
- Turn on heater ... you should be able to adjust up to 140.

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