There are wood supports under the tank that it sits on. Then a few screws through the flange attach it to the wall from the outside. Hopefully you haven't developed some rot in the wood that is supporting it. I now wish I had taken photos of all the inside when I replaced our water heater in 2016 when the tank had a leak. Just have this one of the tank with the insulation removed.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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