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. OT199N
    OptiTHERM modulating, condensing high-efficiency commercial water heater • 99 gallon • 199,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT199N
    SKU: 55805
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  2. OT125N
    OptiTHERM modulating, condensing high-efficiency commercial water heater • 99 gallon • 125,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT125N
    SKU: 55800
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  3. OT150N
    OptiTHERM modulating, condensing high-efficiency commercial water heater • 99 gallon • 150,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT150N
    SKU: 55802
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  4. OT125N-H25
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 5,400 ft. max. • 99 gallon • 125,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT125N-H25
    SKU: 55820
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  5. OT150N-H25
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 5,400 ft. max. • 99 gallon • 150,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT150N-H25
    SKU: 55822
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  6. OT199N-H25
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 2,000 ft to 5,400 ft. max. • 99 gallon • 199,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT199N-H25
    SKU: 55825
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  7. OT125N-H58
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 5,400 ft to 7,800 ft. max. • 99 gallon • 125,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT125N-H58
    SKU: 55830
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  8. OT150N-H58
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 5,400 ft to 7,800 ft. max. • 99 gallon • 150,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT150N-H58
    SKU: 55832
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  9. OT199N-H58
    OptiTHERM modulating, condensing high-efficiency commercial water heater • Altitude above 5,400 ft to 7,800 ft. max. • 99 gallon • 199,000 BTU/hr • Natural Gas • NSF/ANSI certified • CUL listed
    Model: OT199N-H58
    SKU: 55835
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