Gas Water Heaters

Bock is your first choice for all your commercial gas water heater needs. Our industry leading optiTHERM modulating condensing water heaters in sizes up to 500,000 BTU, provide up to 99% thermal efficiency, have an automatic cathodic protection system, LCD user interface and five year warranty.

Our EZ Fit atmospheric water heaters are easy to install and available in Power Direct Vent, Low NOx, Internal Coil and a host of other models.

Shop By

Items 1-9 of 48

Page
per page
Set Descending Direction

Items 1-9 of 48

Page
per page
Set Descending Direction
  1. 150G-400
    ASME CONSTRUCTED MULTI-FLUE INDUSTRIAL WATER HEATER WITH POWER GAS BURNER
    Model: 150G-400
    BTU: 400,000 (117.23)
    Gal: 160 gallon
    SKU: 56701
    View Product
  2. OT300LP-H58
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitudes above 5,400 ft to7,800 ft. max. • 119 gallon • 300,000 BTU/hr • LP Gas • NSF/ANSI certified • CUL listed
    Model: OT300LP-H58
    BTU: 300,000 (87.92)
    Gal: 119 gallon
    SKU: 55722
    View Product
  3. ODOT300N-A
    OptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • 125 gallon • 300,000 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified
    Model: ODOT300N-A
    BTU: 300,000 (87.92)
    Gal: 125 gallon
    SKU: 55864
    View Product
  4. ODOT300N-A-H25
    OptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • Altitudes above 2,000 ft to 5,000 ft max • 125 gallon • 300,000 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified
    Model: ODOT300N-A-H25
    BTU: 300,000 (87.92)
    Gal: 125 gallon
    SKU: 55876
    View Product
  5. ODOT400N-A
    OptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • 125 gallon • 399,999 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified
    Model: ODOT400N-A
    BTU: 399,000 (116.94)
    Gal: 125 gallon
    SKU: 55862
    View Product
  6. ODOT400N-A-H25
    OptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • Altitudes above 2,000 ft to 5,000 ft max • 125 gallon • 399,999 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified
    Model: ODOT400N-A-H25
    BTU: 399,000 (116.94)
    Gal: 125 gallon
    SKU: 55874
    View Product
  7. ODOT500N-A
    OptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • 125 gallon • 500,000 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified
    Model: ODOT500N-A
    BTU: 500,000 (146.50)
    Gal: 125 gallon
    SKU: 55860
    View Product
  8. ODOT500N-A-H25
    OptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • Altitudes above 2,000 ft to 5,000 ft max • 125 gallon • 500,000 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified
    Model: ODOT500N-A-H25
    BTU: 500,000 (146.50)
    Gal: 125 gallon
    SKU: 55872
    View Product
  9. ODOT300LP-A
    OptiTHERM Outdoor modulating, condensing high-efficiency commercial water heater • UL Listed for outdoor use in dry, warm climates • 125 gallon • 300,000 BTU/hr • LP Gas • ASME certified • NSF/ANSI certified
    Model: ODOT300LP-A
    BTU: 300,000 (87.92)
    Gal: 125 gallon
    SKU: 55870
    View Product