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. OT300N2-A
    OptiTherm modulating condensing high effeciency commercial water heater. 125 gallons. 300,000 BTU/hr. Natural Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT300N2-A
    BTU: 300,000 (87.92)
    Gal: 125 gallon
    SKU: 55660-2
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  2. OT400N2-A
    OptiTherm modulating condensing high effeciency commercial water heater. 125 gallons. 400,000 BTU/hr. Natural Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT400N2-A
    BTU: 400,000 (117.23)
    Gal: 125 gallon
    SKU: 55662-2
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  3. OT500N2-A
    OptiTherm modulating condensing high effeciency commercial water heater. 125 gallons. 500,000 BTU/hr. Natural Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT500N2-A
    BTU: 500,000 (146.50)
    Gal: 125 gallon
    SKU: 55665-2
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  4. OT400LP2-A
    OptiTherm modulating condensing high effeciency commercial water heater. 125 gallons. 400,000 BTU/hr. LP Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT400LP2-A
    BTU: 400,000 (117.23)
    Gal: 125 gallon
    SKU: 55692-2
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  5. OT500LP2-A
    OptiTherm modulating condensing high effeciency commercial water heater. 125 gallons. 500,000 BTU/hr. LP Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT500LP2-A
    BTU: 500,000 (146.50)
    Gal: 125 gallon
    SKU: 55695-2
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  6. OT600N-A
    OptiTHERM modulating condensing high efficiency commercial water heater. 130 Gallons. 600,000 BTU/hr. Natural Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT600N-A
    Gal: 130 gallon
    SKU: 55940
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  7. OT700N-A
    OptiTHERM modulating condensing high efficiency commercial water heater. 130 Gallons. 700,000 BTU/hr. Natural Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT700N-A
    Gal: 130 gallon
    SKU: 55942
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  8. OT800N-A
    OptiTHERM modulating condensing high efficiency commercial water heater. 130 Gallons. 800,000 BTU/hr. Natural Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT800N-A
    Gal: 130 gallon
    SKU: 55944
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  9. OT900N-A
    OptiTHERM modulating condensing high efficiency commercial water heater. 130 Gallons. 900,000 BTU/hr. Natural Gas. ASME Certified. NSF/ANSI Certified. UL Listed
    Model: OT900N-A
    Gal: 130 gallon
    SKU: 55946
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