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.

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  1. OT200N-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 7,800 ft. max. • 100 gallon • 199,999 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT200N-H28
    SKU: 55757
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  2. OT250N-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 7,800 ft. max. • 100 gallon • 250,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT250N-H28
    SKU: 55760
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  3. OT299N-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 7,800 ft. max. • 100 gallon • 299,999 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT299N-H28
    SKU: 55762
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  4. OT300N-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitudes above 2,000 ft to 7,800 ft max • 119 gallon • 300,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT300N-H28
    SKU: 55682
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  5. OT400N-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitudes above 2,000 ft to 7,800 ft max • 119gallon • 399,999 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT400N-H28
    SKU: 55685
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  6. OT500N-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitudes above 2,000 ft to 7,800 ft max • 119 gallon • 500,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT500N-H28
    SKU: 55687
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  7. OT200N-A-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 7,800 ft. max. • 100 gallon • 199,999 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified • CUL listed
    Model: OT200N-A-H28
    SKU: 55750
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  8. OT250N-A-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 7,800 ft. max. • 100 gallon • 250,000 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified • CUL listed
    Model: OT250N-A-H28
    SKU: 55752
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  9. OT299N-A-H28
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 7,800 ft. max. • 100 gallon • 299,999 BTU/hr • Natural Gas • ASME certified • NSF/ANSI certified • CUL listed
    Model: OT299N-A-H28
    SKU: 55755
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