A.O. Smith ProMax® 50 gal 50 MBH Natural Gas Water Heater


  • The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance
  • Green Choice gas burner - patented eco-friendly burner design reduces NOx emissions by up to 33% and complies with Low-NOx emission requirements of less than 40 ng/J
  • DynaClean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output and is made from long lasting PEX cross-linked polymer
  • Blue Diamond glass coating provides superior corrosion resistance compared to the industry standard glass lining
  • Core Gard anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods
  • Push button Piezo ignitor makes lighting the pilot fast and easy with one-hand push button spark ignition
  • Heat trap nipples are factory installed
  • CSA certified and ASME rated T&P relief valve
  • Enhanced flow brass drain valve which is standard on our residential water heaters, have a solid brass, tamper resistant, enhanced flow, ball type, drain valve
  • 6-year limited tank and parts warranty


50 gal
Application Residential
BTU 50000
CSA Certified CSA 4.1
Capacity 50 gal
Collection ProMax®
Depth 22 in
Diameter 22 in
First Hour Rating 92
Fuel Type Natural Gas
GSA Approved No
Height 60-3/4 in
IAPMO Listed No
Ignition System Push Button Ignition
MBH 50
Maximum Pressure 150 psi
NSF Certified No
Power Source Gas
Supply Pipe Connection 3/4 in
UL Listed No
Vent Type Atmospheric Vent
Water Heater Capacity Range 41 - 50 gal
Width 22 in