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. 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
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  2. 361PG MIDCO
    NON-ASME POWER GAS WATER HEATER WITH MIDCO RE4400DS GAS BURNER
    Model: 361PG MIDCO
    BTU: 385,000 (112.83)
    Gal: 91 gallon
    SKU: 58140
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  3. OT300N2
    OptiTherm modulating condensing high effeciency commercial water heater. 119 gallons. 300,000 BTU/hr. Natural Gas. NSF/ANSI Certified. UL Listed
    Model: OT300N2
    BTU: 300,000 (87.92)
    Gal: 119 gallon
    SKU: 55667-2
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  4. OT400N2
    OptiTherm modulating condensing high effeciency commercial water heater. 119 gallons. 400,000 BTU/hr. Natural Gas. NSF/ANSI Certified. UL Listed
    Model: OT400N2
    BTU: 400,000 (117.23)
    Gal: 119 gallon
    SKU: 55670-2
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  5. OT500N2
    OptiTherm modulating condensing high effeciency commercial water heater. 119 gallons. 500,000 BTU/hr. Natural Gas. NSF/ANSI Certified. UL Listed
    Model: OT500N2
    BTU: 500,000 (146.50)
    Gal: 119 gallon
    SKU: 55672-2
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  6. OT300N2-H28
    OptiTherm modulating condensing high effeciency commercial water heater. Altitudes above 2,000 to 7,800 ft max. 119 gallons. 300,000 BTU/hr. Natural Gas. NSF/ANSI Certified. UL Listed
    Model: OT300N2-H28
    BTU: 300,000 (87.92)
    Gal: 119 gallon
    SKU: 55682-2
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  7. OT400N2-H28
    OptiTherm modulating condensing high effeciency commercial water heater. Altitudes above 2,000 to 7,800 ft max. 119 gallons. 400,000 BTU/hr. Natural Gas. NSF/ANSI Certified. UL Listed
    Model: OT400N2-H28
    BTU: 400,000 (117.23)
    Gal: 119 gallon
    SKU: 55685-2
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  8. OT500N2-H28
    OptiTherm modulating condensing high effeciency commercial water heater. Altitudes above 2,000 to 7,800 ft max. 119 gallons. 500,000 BTU/hr. Natural Gas. NSF/ANSI Certified. UL Listed
    Model: OT500N2-H28
    BTU: 500,000 (146.50)
    Gal: 119 gallon
    SKU: 55687-2
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  9. OT300LP2
    OptiTherm modulating condensing high effeciency commercial water heater. 119 gallons. 300,000 BTU/hr. LP Gas. NSF/ANSI Certified. UL Listed
    Model: OT300LP2
    BTU: 300,000 (87.92)
    Gal: 119 gallon
    SKU: 55697-2
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