We will be converting a three families brownstone into two families and we have this A.O. Smith Conservationist ’90 water heater that you see on the picture. I assume it’s not the most efficient, but I don’t really understand anything about water heater’s efficiency. If anybody understand what all the numbers say, please let me know if we should replace it for a new gas water heater or a tankless heater for each of the two units.


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