Question about Rheem 81VP6S/430126 Water Heater

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We just installed a Rheem 50 gallon water heater. When you use any hot water a low pitched vibrations occurs that you can hear in the bathroom and bedroom. When the water heater completes the heating cycle the vibration stops. We have replaced the heating elements in the new water heater and that did not solve the problem.

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Every electric water heater I have ever installed makes a low hum while heating. I believe this is a combination of the current going through the elements and the minerals in the water cooking on the elements. That is the best explanation I have. Hope this helps.

Posted on May 13, 2010

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Posted on Jan 02, 2017

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Energy factor rating


Rheem 50 gallon Pro52-2 has EF .95, which makes it ordinary 240Volt 4500 watt non-simultaneous electric water heater that produces about 21 gallons hot water per hour, with 67 gallon first hour delivery.
Recommend 80 gallon per hour first hour for oversized bathtub.
http://bostonheatingsupply.com/Rheem/Rheem%20Residential%20Electric/Professional/Rheem_ResidentialElectric_Professional%20Spec%20Sheet.pdf

Maintain electric water heater and it will last indefinitely.
http://waterheatertimer.org/How-to-maintain-water-heater.html
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

Anode rod is located on top in separate port.
Anode keeps tank from rusting.

Year of Rheem water heater manufacture shows 3rd and 4th digit of serial number.

Nov 25, 2012 | Water Heaters

1 Answer

Where can i get a 21dv50 water heater to buy


21dv50 is discontinued. This is ordinary tank-type 50 gallon gas water heater.
Amazon sells 50 gallon 22V50F1 Rheem water heater for $420 with free shipping ... but who carries the warranty?

Frankly you can get in-store returns, and buy same quality gas water heater at local box store since Rheem makes GE water heaters at home Depot.
Other brands are equally good, as AO Smith makes Kenmore water heaters at Sears and Whirlpool at Lowes.

I prefer the AO Smith because maintenance is easier.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Sep 17, 2012 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Heater takes more than 1 minute to get water to kit faucet , then temp fluctuates


1) Guesses: Sounds like a bad single-handled faucet cartridge, or low water flow at faucet, or clogged water filter.
Replace faucet cartridge, clean the aerator, and/or clean sediment out of pipes below sink, and clean water filter at tankless unit each month.

2) For exact measure of problem:
Typical faucet can have 2 gallon per minute flow rate.
2 gpm flow rate means faucet fills 1 gallon container in 30 seconds. Test faucet using 1 gallon container and a cooking timer to get flow rate.
Clean aerator to improve flow rate. Compare kitchen flow rate with other faucets in home.
http://waterheatertimer.org/Low-hot-water-pressure.html

Most homes have 1/2" diameter pipe running to kitchen faucet.
100 feet of 1/2" diameter pipe holds 1.2 gallons of water. This assumes no sediment build-up inside pipes.
http://waterheatertimer.org/Water-heater-recirculation-system.html

Assuming only hot is turned on: If faucet is 100 feet away from water heater, and pipe diameter is unobstructed 1/2" diameter, and faucet has 2 gallon per minute water flow, then hot water should arrive in 36 seconds.
50 feet away, and hot water should arrive in 18 seconds.

If kitchen has single handled faucet, and the handle is raised in the middle, then equal amounts of hot and cold water are drawn at same time. This doubles amount of time for hot water to arrive.

If single handle faucet has a bad cartridge, then faucet can have crossover.
Crossover means that cold water can enter the faucet even if faucet is turned to hot.
Bad single-handled faucet cartridge can delay or stop the arrival of hot water.
http://waterheatertimer.org/Crossover.html

Tankless require maintenance including cleaning combustion parts yearly, de-lime heat exchanger frequently, and clean water filter each month.
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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Sep 15, 2011 | Rheem Direct Vent Natural Gas Tankless...

1 Answer

RHEEM 50 GALLON WATER HEATER,4 BLINKS THEN 2 BLINKS ,ECO FAILURE,UNPLUGGED HEATER STARTS UP AGAIN THEN FAILURE OCCURS AGAIN.


That is a power vent failure code.
Rheem is aware of this problem and are changing systems as we speak. Call your Rheem dealer and demand the updated system.

Feb 07, 2011 | Water RHEEM 40 Gallon FVR PROP PWR Heater...

1 Answer

If my 50 gallon water heater is leaking can i replace it with a smaller water heater?


There should be no problem replacing a 50 gallon heater with a smaller size heater as long as the codes for your city/town allow it. You may also need to pull a permit for the installation, check with your municipality. Some codes state that a home with X square feet or whatever measurement they want to go by, will need at least a 50 gallon hot water heater. Obviously all installation instructions and codes apply to any new hot water heater installation.

Sep 10, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Rheem 21VP50-1. On hot water for 3 days. Shut of and turned on power...no ignition, no blower, no clicking.


Unplug the power supply for 10 minutes and plug it back in. If the standard start up does not occur, you have bad control valve or the Flammable Vapor Censer has trip the unit. In either case you need to contact Rheem for repair parts or a new heater.

Sep 07, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Loud Vibration/Noise when System Starts


This happen when there is air in the gas line...if the problem is still there after a couple of days you will have to return the unit for an exchange the gas control is giving problem...contact rheem first before making a exchange decision..they will walk you some step first to ensure there is not a problem

Jul 03, 2010 | Rheem Direct Vent Natural Gas Tankless...

1 Answer

We just installed a Rheem 50 gallon water heater. When you use any hot water, a low pitched vibrations occurs that you can hear in the bathroom and bedroom. When the water heater completes the heating...


Listen close near any check valve that may be in the piping system, as well as the pressure relief valve on tank. It may be a check valve rattling, but you normally will only experience that when water is flowing in and out of the system.

Mar 19, 2010 | Rheem 81VP6S/430126 Water Heater

1 Answer

Rheem model #GP40T6PF00 lp hot water heater Will


sounds like one of the saftey relays might be going bad. or the ingniter might be cracked or need cleaning

Mar 08, 2010 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Rheem 50 gallon gas water heater less than one year old runs out of hot water almost immediately. They changed the thermostat and it worked for a few weeks then it stopped again. Any ideas?


it could also be the dip tube. this is a tube that is installed at the time the unit is made.it is a plastic tube that is on the cold intake side of the hot water heater.it may have fallen inside the unit or may not be in the unit at all check to see if there is a plastic tube this will help the heater stay hotter for a longer period of time. good luck with your project.

Sep 29, 2009 | Rheem 50 Gallon FVR NATGAS Water Heater...

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