Odor in hot water - Rheem RTG-74PVN-2 Natural Gas Pronto Whole House, Natural Gas, Tankless Wat

What is temp set at and when was it last drained to clean out are you using city water or well water

Anode rod will react with harmless bacteria and cause odor in hot water
Troubleshoot and replacement steps following link:
http://waterheatertimer.org/Replace-anode-rod.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Sounds like calcium plugging. Drain the heater when it is off. Drain valve is above the outlet nozzle on the heater.

http://waterheatertimer.org/Replace-anode-rod.html

harmless bacterial reacts with anode rod
anode protects tank from rusting
change anode, or remove anode, or treat tank regularly with hydrogen peroxide

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

1) Odors are caused by harmless bacterial reacting with anode rod.
http://waterheatertimer.org/Replace-anode-rod.html

2) If odor is in both hot and cold water, problem can be other causes.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

The anode is located under the power vent.
Remove power vent to gain access.
Otherwise, remove Hot water nipple and install combo anode rod. If odor is the reason for replacement, then installing a combo without removing the old anode will not solve odor problem until old anode completely dissolves over time.
Copy following link for specific information and illustrations, including odor elimination using hydrogen peroxide.
http://waterheatertimer.org/Replace-anode-rod.html

For easy access next time, you can remove old anode and plug hole, and then install combo rod.
If longevity of tank is reason you are accessing the anode, you can add a second combo anode in addition to the original anode and give longer protection

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Generally tank odors are bacteria reacting with anode rod.
Make sure odor is isolated to water heater, and on hot water line only so you know water heater is best suspect.
Change anode rod.
http://waterheatertimer.org/Replace-anode-rod.html

Your plumber will know all about anode rods and will have tools or impact wrench for removing old anode rod.

It sounds like you need to replace the anode rod on your water heater. They come from the factory with a magnezium rod to slow down electrolytic deteiroation. With the odor you are getting you probably have a high sulphur content,,I think the proper terminology is suspended sulfides,I guess it doesn't matter what you call it it stinks. You can replace the magneziun anode rod with one made out of aluminum to help with this problem. Hope this helps you. Thanks. P.S. anode rod is screwed into the top of the water heater and has a hex head so you can use a box end wrench or socket to remove and reinstall. You can also use hack saw to cut rod to lenght needed to fit. Thank you.

Hello CATHY Have the ANODE rod replaced in the heater.That should help as they wear out over time.

U can clorinate ur water heater 1 gallon will do it. But you should try changing the anode rod(to aluminum) or removing it first followed by a complete drain, purge and refill.