Rheem 40 Gallon FVR NATGAS Low WATER HEATER 6YR 22V40SF "amazon returns" Questions

...Amazon sells 50 gallon 22V50F1 Rheem water heater for $420 with free shipping ... but who carries the warranty?Frankly you can get in-store returns, and buy same quality gas water heater at local box ...

...to 500F), and you'll need some with 1/8" or 3/16" inside diameter. I bought some from an Amazon seller, 1/8" ID and 3/8" OD with thick 1/8" walls. (Edit: The original tubing ...