Rheem model 21140DV
Call Rheem, they do not support gas change on all models:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
Gene
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SOURCE: dripping from drain spout
If you are refering to the "Dripping coming from the preasure tempature valve,Then just turn off the valve where the water goes into the heater and open the P/T valve with a bucket below it draining only emought water to get below the level where it reaches. Normally the drain valves are plastic with a Male hosebib attached. Attach a garden hose to the rain and run it out to a point lower that the vaslve in order for gravity to drain the tank.The valve opens counter clock wise. If the valve is stuck or does not drain,and you have a foor drain handy,remove the whole valve and replace it with a boiler drain valve. If The tank is located below the drain level then you will have to either pump or carry the drain water to the higher level. Replace the P/T valve and reinstall the associated associated piping. I would use tefelon tape on the P/T pipe theads. You may have to open a hot water faucet in order for the air to replace the water in the tank ,in order to drain.
SOURCE: I have a Model 41V50 Rheem water heater (50 gal.
You don't need to find the same exact model to replace your water heater, any 50 gallon water heater will do unless you have a brand specification that you like to stick with.
SOURCE: where is anode rod located on 100 Gallon rheem
Anode rods for tank-type water heaters are located on top of tank.
This is true since anodes are about 44" long.
Top of anode is standard 1-1/16" hex nut.
Anodes can be located in 2 different places: either directly screwed into top of tank -or- attached to hot water nipple.
Most times the exploded parts diagram in manual simply shows 'anode rod' without specifing exact location. If your tank has long warranty, then it can have two anode rods, and 1 will be on top and the other probably attached to hot water nipple, or there could be two anodes screwed into top of tank.
http://waterheatertimer.org/Replace-anode-rod.html
If anode is screwed into top of tank, then it will be under a plastic cap -or- it will be concealed under the top cover of tank.
Look for plastic cap, and if none shows, then remove screws holding down metal cover and look there for 1-1/16" hex nut.
Lastly, remove hot water nipple and check for anode located there.
If you have 2 anode rods, then replace with same metal for each.
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SOURCE: Pilot won't light on Rheem
Following information is for tank-type gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/pdf/Pilot-light-will-not-stay-lit.pdf
http://waterheatertimer.org/pdf/Attic-Ventilation-and-Pilot-Outage-in-Gas%20Water-Heaters.pdf
http://waterheatertimer.org/images/Water-heater-in-attic-800.jpg
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