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In reply to the discussion: Seeking advice on water heaters [View all]NBachers
(19,690 posts)fairly easy to install. If they didn't try installing a thermocouple, I'd run from them.
Your pilot light's flame is focused on a small metal rod called a thermocouple. The heated rod produces a small amount of electricity. This electricity keeps the small valve open that supplies gas to the pilot light.
The thermocouple is a safety device. If the pilot light goes out, the thermocouple cools off. The electricity stops. This closes off the supply of gas to the pilot light. It keeps un-burned gas from flowing into your environment. Sometimes the thermocouple wears out and needs to be replaced.
Any plumber or most handymen / women know how to replace a thermocouple. They cost less than twenty bucks. Check out "Water heater thermocouple" online or on YouTube. Verify that Roto-Rooter replaced the thermocouple.
Do NOT buy a new water heater if the thermocouple has not been replaced on your old water heater first! You may not need a new water heater.
https://www.homedepot.com/c/ah/how-to-replace-a-thermocouple/9ba683603be9fa5395fab901ced3a679