The house currently has an A.O. Smith 40gal water heater. From what I can tell from the label, it's rated 72FHR, 40k BTU, R value 7. Lately, it's leaking a small amount of water from the base so I know it needs replacement. Afterall, it look like the unit is installed back in 1997.
I have 6 adults in the house with 2 bathroom. Half like to take baths while the other half like to take showers. I have the temperature dial between B and C and that seem to be just enough hot water. From research, I should get a unit with R16, magnesium anode, and a high FHR.
I seem to narrow it down to the A.O. Smith Conservationist XGV-40 but that unit seem very pricey compare to others, especially for a 40gal unit. It does have a high FHR of 81. The other is the Rheem Professional Guardian System 22V50PROF. I am a bit confused between the Rheem 22V50PROF and the 42V50-40PROF. They are both 50gal but the 22V50PROF is rated with FHR 90 with only 38k BTU while the 42V50-40PROF is rated with 83 FHR with 40k BTU. So is the 22V50PROF more efficient?