Rheem Tankless Water Heater User Guide
- June 7, 2024
- Rheem
Table of Contents
Rheem Tankless Water Heater
Rheem Tankless Water Heater
Rheem Tankless Water Heater
Use remote control to set temperatures up to 120ºF: Test current
temperature with cooking thermometer at different sinks and faucets. Remote is
factory set to 100ºF
To adjust temperature higher than 120ºF <> up to 140ºF, then read your
specific product manual for dip switch settings. Information here will apply
to SOME models. Heavy duty models can be adjusted up to 180ºF Dip switch
settings should be adjusted by professionally trained person only.
If temperature rise is too much for incoming water temperature, or venting
capacity, or air supply or gas supply, or combination of factors, then
tankless will shut off.
- Turn off remote control. Turn off the gas and water shutoff valves.
- Remove front cover.
- Find DIP Switch #4 located at the top left hand side of PCB.
- Change the DIP Switch #4 setting to the “ON” position. DO NOT alter any other DIP Switch. The LED on the PCB is flashing. At the same time, the display of the Main Remote Control starts to flash.
- Press the “SW1” button on the left hand side of the PCB for more than 1 second. The LED on the PCB starts illuminating continuously. At the same time, the display of the Main Remote Control is on continuously.
- Change the DIP Switch #4 setting back to the “OFF” position. DO NOT alter any other DIP Switch. The LED on the PCB will stop illuminating. At the same time, the display of the Main Remote Control will turn off. Attach the unit’s front cover.
- Turn on the remote control, gas and water shutoff valves.
- Check and ensure safe operation and performance of the water heater.
You want 140º from tankless? And incoming water temperature is 50º Temperature rise is 140º subtract 50º = 90º, so gallons per minute (GPM) will fall
Flow rates
Flow rates depend on temperature of incoming water –and- capacity of tankless unit.
Chart below is based on 65º incoming water temperature, which is average year- round for Southern States. Average year-round for mid-Illinois is approx 54º. Chart below is skewed toward warmer climates. Place cooking thermometer under cold water tap to get comparison reading.
Fig 1 Numbers are for new tankless working at optimal performance
- Typical shower uses 2.5 gallons per minute, typical faucet 2 gallons per minute
- The hotter the shower water, the more cold water is used.
Hotter temperature setting on tankless will cause you to use more cold water,
reducing water flow through tankless increasing risk that tankless will not
turn ON.
Numbers shown in Fig 1 above are for new tankless unit working at optimal
performance without allowance for age of unit or venting, air supply or gas
supply or lack of maintenance.
Fig 2 Average ground water temperature
Fig 3 Add tempering tank to passively or actively preheat cold water so tankless can supply hot water. Locate tempering tank in naturally warm location, also use to integrate tankless with solar collector
From typical Rheem manual
- Should you have questions about your new water heater, or if it requires adjustment, repair, or routine maintenance, it is suggested you first contact installer, plumbing contractor or previously agreed upon service agency. If the firm has moved, or is unavailable, refer to telephone directory, commercial listings or local utility for qualified service assistance.
- Should your problem not be solved to complete satisfaction, you should then contact Manufacturer’s National Service Department at following address:
2600 Gunter Park Drive
Montgomery, Alabama 36109-1413
Phone: 1-800-432-8373
When contacting manufacturer, the following information will be requested:
- Model and serial number of water heater as shown on the rating plate attached to front panel of heater.
- Address where water heater is located and physical location.
- Name and address of installer and any service agency who performed service on the water heater.
- Date of original installation and dates any service work was performed.
- Details of the problem as you can best describe them.
- List of people, with dates, who have been contacted regarding your problem.
If tankless temperature is not what it used to be, then de-lime your tankless
water heater. Search U-tube for ‘Delime tankless’ for Do-it-yourself steps
Rheem-De-lime-tankless [PDF]For Troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
DOWNLOAD RESOURCES
- Rheem Tankless Water Heater User Guide – Download [optimized]
- Rheem Tankless Water Heater User Guide – Download
FAQ’S
Why is the display of the Main Remote Control on continuously?
The Main Remote Control is in the programming mode.
Why is the LED on the PCB flashing?
The Main Remote Control is communicating with the PCB.
Why do I have to change the DIP Switch #4 setting to the “ON” position?
To allow programming of the Main Remote Control.
Why do I have to press the “SW1” button for more than 1 second?
To allow programming of the Main Remote Control.
Why do I have to change DIP Switch #4 back to the “OFF” position?
To exit from programming mode.
What is the life expectancy of a Rheem tankless water heater?
Rheem hot water systems have a typical life span of between 5 and 15 years depending on water conditions and how well the system has been serviced. You can add years to the life to a Rheem hot water system if you have it serviced every 5 years.
What is the most common problems with tankless water heaters?
Here are six of the most common problems and maintenance concerns for tankless
water heaters:
Mineral Buildup.
System Overload.
Cold Water Sandwich.
Air Supply or Exhaust Blockage.
Ignition Failure.
Flame Failure.
Do tankless water heaters use a lot of electricity?
The EPA estimates that a tankless water heater uses up to 34% less energy than a storage-tank water heater if you use 41 gallons or less of hot water daily.
How many hours a day does a tankless water heater run?
Since they don’t need to heat water when you aren’t using them, tankless heaters may only run for two hours a day or so.
How do you adjust a Rheem tankless water heater?
So to adjust the temperature up what we’re going to do is hold down the up arrow. Then when we see the temperature flash at 140. We’re going to hit the down arrow while still holding the up arrow.
What is normal setting for tankless water heater?
Water will come into the tankless system’s pipes at a certain temperature, probably around 50 degrees Fahrenheit. Generally, most hot water is heated to about 120 degrees Fahrenheit.
Why is my tankless water heater always running?
This is because tankless heaters are designed to run without any delays as they heat water. It’s not uncommon for tankless heaters to be running on high one second and low the next. The problem is that this may potentially make your tankless water heater less efficient, which may cause your energy bill to go up!
Rheem Tankless Water Heater
https://www.rheem.com/
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