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Residential Gas Tank Water Heaters

From high-efficiency ENERGY STAR® certified water heaters to economical standard efficiency gas water heaters, A. O. Smith has a complete line of natural gas and liquid propane tank water heaters to fit your needs.

A. O. Smith
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ProLine® 40-Gallon Atmospheric Vent Tall Natural Gas Water Heater
ProLine® 40-Gallon Atmospheric Vent Tall Natural Gas Water Heater Model GCR-40
  • 40,000 BTU input
  • 80-gallon first hour rating
  • 6-Year Warranty
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ProLine® Master 40-Gallon Atmospheric Vent Tall Natural Gas Water Heater
ProLine® Master 40-Gallon Atmospheric Vent Tall Natural Gas Water Heater Model HWR-40
  • 40,000 BTU input
  • 80-gallon first hour rating
  • 8-Year Warranty
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ProLine® XE 40-Gallon Ultra-Low Nox Atmospheric Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Ultra-Low Nox Atmospheric Vent Natural Gas Water Heater Model GUF-40
  • 68-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon Power Direct Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Power Direct Vent Natural Gas Water Heater Model GPDL-40L
  • 74-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon High Efficiency Flue Damper Tall Natural Gas Water Heater
ProLine® XE 40-Gallon High Efficiency Flue Damper Tall Natural Gas Water Heater Model GCF-40
  • 70-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon High Efficiency Flue Damper Short Natural Gas Water Heater
ProLine® XE 40-Gallon High Efficiency Flue Damper Short Natural Gas Water Heater Model GCFL-40
  • 65-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon Ultra-Low NOx Power Direct Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Ultra-Low NOx Power Direct Vent Natural Gas Water Heater Model GPDNL-40
  • 75-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon Power Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Power Vent Natural Gas Water Heater Model GPVL-40
  • 73-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon Power Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Power Vent Natural Gas Water Heater Model GPVT-40
  • 87-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon Power Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Power Vent Natural Gas Water Heater Model GPVT-40L
  • 87-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon Ultra-Low NOx Power Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Ultra-Low NOx Power Vent Natural Gas Water Heater Model GPVNT-40
  • 42,000 BTU input
  • 91-gallon first hour rating
  • 6-Year Warranty
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ProLine® XE 40-Gallon Power Direct Vent Natural Gas Water Heater
ProLine® XE 40-Gallon Power Direct Vent Natural Gas Water Heater Model GPDL-40
  • 74-gallon first hour rating
  • 6-Year Warranty
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ProLine® Master 40-Gallon Ultra-Low NOx Atmospheric Vent Tall Natural Gas Water Heater
ProLine® Master 40-Gallon Ultra-Low NOx Atmospheric Vent Tall Natural Gas Water Heater Model HUR-40
  • 40,000 BTU input
  • 83-gallon first hour rating
  • 8-Year Warranty
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ProLine® Master 40-Gallon Ultra-Low NOx Atmospheric Vent Tall Natural Gas Water Heater
ProLine® Master 40-Gallon Ultra-Low NOx Atmospheric Vent Tall Natural Gas Water Heater Model HUC-40
  • 40,000 BTU input
  • 83-gallon first hour rating
  • 8-Year Warranty
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ProLine® Ultra-Low Nox Direct Vent 40-Gallon Gas Water Heater
ProLine® Ultra-Low Nox Direct Vent 40-Gallon Gas Water Heater Model GDNL-40L
  • 36,000 BTU input
  • 81-gallon first hour rating
  • 6-Year Warranty
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