TLDR Review: A.O. Smith ProMax Plus 40 Gallon
Published: March 2nd, 2026
Pros
- •Heats water almost immediately on demand
- •Runs for brief periods only when hot water is drawn, improving efficiency
- •Notable improvement over older heating systems
- •Provides good value
- •Outstanding quality compared to other units
Cons
Bottom Line
Based on reviews we've collected, this A.O. Smith propane water heater gets high marks for responsive heating and efficiency. Reviewers consistently praise its reliability and feel they're getting solid value at $753.29, especially compared to older systems. Just make sure you have a propane supply lined up, because this unit is designed to run on that fuel source—but if you do, you've got yourself a dependable hot water solution.
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