Model: RG50-50CM
Serial: 0791J97815

Capacity: 50 US Gallons
50,000 BTU
Recovery - 42 (?)

Installed - 1991

What's the energy factor of this old gas waterheater? Were waterheaters even rated in the early 90s?

I'm curious to know if today's natural draft models are significantly more efficient than what I have. I looked at the specs of new models and they're all piss poor - ranging from 0.58 to 0.60.