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I was able to replicate the problem by blocking the vent completely. The flame dies in exactly the same manner, by choking on exhaust. I hadn't installed a draft diverter since the last WH (also a BW) worked for for 20 years without one. The problem was due to VERY minor back pressure caused by...

Try this: https://photos.app.goo.gl/FtpUNzj3SZDegKCx7

See if water will flow down the vent pipe (from the roof). Make sure you have someone monitoring the toilets to see if one starts filling. If the Vent is straight try dropping a flashlight on a string down to see if there is a physical restriction. Is your vent on an outside wall - could...

I'm not a professional plumber, but this seems like somebody goofed and won't admit it.

I have a 2 month old propane gas BW water heater. It works fine 99 percent of the time, but goes out randomly. In observing how it dies I've noticed the following: It sounds like gas is still flowing, and the TC indicator light is blinking when it dies. The flame remains blue as it dies. The...