how does a natural gas water heater works?

Question: i have a SURN water heater and trying to repair it. i changed the small leaking gas tube and installed a new thermocouple but the main gas tube doesn't work. what is my problem?

Answer: First----Do you mean a Zurn water heater instead of Surn? Two----Is it a 2003 year model or newer? Three---What was the initial problem for you to begin repairing? Let me know. I'll reply tomorrow.

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