AO Smith ProMax 50-Gallon Gas Water Heater
AO Smith ProMax 50-Gallon Gas Water Heater Review
The AO Smith ProMax 50-Gallon Gas is AO Smith's mainstream gas tank line, positioned in the same tier as Rheem Performance. 40,000 BTU input, UEF 0.58–0.62 depending on sub-model, 81-gallon first-hour rating, 6-year warranty on tank and parts. Atmospheric vent through B-vent. Self-cleaning dip tube, magnesium anode rod, polyurethane foam insulation.
ProMax is AO Smith's value tier — below the Signature Premier (12-year warranty) and Vertex (condensing) lines. The ProMax 50-gallon Gas is functionally equivalent to the Rheem Performance 50-gallon Gas with different cosmetic styling and Lowe's-channel distribution. The 6-year warranty is the largest practical difference versus the 12-year Signature Premier or Rheem Performance Platinum.
Right buyer: rental property landlords, vacation homes used 4–6 weeks per year, primary-residence buyers on a 5–7 year ownership horizon. The 6-year warranty matches typical landlord-replacement cycles; the per-unit cost is $150–$250 below the 12-year tier. For longer ownership horizons, the upgrade to Signature Premier or Performance Platinum pays back through avoided early replacement.
About $649 at Lowe's, $1,350 installed. Like-for-like 50-gallon atmospheric gas tank replacement is a 90-minute plumber job.