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All Categories > Commercial Water Heaters > NON NOx Commercial Water Heaters > HTP® NON NOx Commercial Water Heaters > HTP® Heavy Duty Commercial Gas Fired Water Heaters > Item # CG150N73  

Item # CG150N73, HTP® Heavy Duty Commercial Gas Fired Water Heaters

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  • Advanced Heating and Hot Water Systems.
  • Commercial Gas Fired Water Heater.
  • Flexible Front and Rear Connections.
  • Built to Last Longer.

Unit of Measure: Imperial Metric Both

Specifications  · Maximum Recovery (ºF)  · Dimensions  · Features  · More Steel Where It Counts  · What's in the Box  · Standard Features  · Optional Equipment  · Warranty  · Note





73 gal

Input Power

150000 BTU/hr

Inlet/Outlet (NPT)

1.5 in

Shipping Weight

429 lb


Natural Gas

Available Kits

High altitude kits available for units installed at altitudes over 7000 feet.
  1. Vent Pipe
  2. Flue Damper / Draft Hood Assembly
  3. Hot Water Outlet
  4. Cold Water Manual shut-off Valve
  5. Temperature & Pressure Relief Valve
  6. Expansion Tank
  7. Overflow Tube
  8. Cold Water Inlet
  9. Cleanout Cover Access Door
  10. Drain Valve
  11. Drain Pan
  12. Free-Flowing Floor Drain
  13. Union
  14. Burner Assembly
  15. Gas Valve
  16. Union
  17. Cap
  18. Drip Leg (Sediment Trap)
  19. Gas Supply Manual Shut-off Valve
  20. Electric Box
  21. Aquastat / High Limit Control
  22. Union
  23. Temperature Sensor
  24. Flue Damper Motor
  25. Flue Damper Support Leg

Maximum Recovery (ºF)

Recovery at 100 ºF Temperature Rise

145.5 gal/h



Dimension A

15-3/4 in

Dimension B

52-1/2 in

Dimension C

64-3/8 in

Dimension D

6-3/8 in

Dimension E1

25-1/4 in

Dimension E2

58-1/4 in

Dimension E3

25-1/4 in

Dimension E4

58-1/4 in

Dimension F

70-7/8 in

Dimension G

33 in

Dimension H

6 in

Dimension I

26-1/2 in

  • Blue Cobalt Glass-lined tank

  • Long lasting blue cobalt glass is fused to specially formulated steel at 1,600 ºF to provide the best coating available against corrosion. The tank is certified at a test pressure of 300 PSI and a working pressure of 150 PSI.
  • Multi-port, energy efficient burners

  • Quiet Burner! The burner tray slides out easily for quick inspection & easy maintenance.
  • Low profile automatic flue damper

  • Closes automatically when the demand for heat stops, reducing stand-by heat loss.
  • High density insulation.
  • Automatic temp control system

  • The thermostat is fully adjustable up to 180 ºF. It is equipped with an integrated energy cutoff (ECO) and high temperature cut-off switch to protect against overheating.
  • Factory installed T&P relief valve.
  • Spark to pilot ignition system.
  • Intelligent led diagnostic system

  • Designed to give a visual indication of the operational status of the water heater. This panel also identifies where to begin troubleshooting a non-functional water heater.

More Steel Where It Counts
Every commercial gas water heater endures constant day-to-day stress due to frequent changes in temperature. Critical stress points are located where tank components are welded - most notably at the flue tubes and where the tank bottom joins the tank. HTP® has made these stress points much more leak resistant thru design, extra thick steel and special welding techniques.

The largest steel collar used in the industry is welded from outside of the tank bottom and top, permitting stronger welding of the flue tubes. The tank bottom and top and the flue tubes are glass-lined separately with an industrial grade coating of a blue cobalt glass.

The refractory combustion chamber is insulated entirely with 3/4" of ceramic fiber. This feature permits better heat retention in the combustion chamber, translating into a higher heat exchange to the water.

What's in the Box
  • Low Profile Automatic Flue Damper
  • Intelligent LED Diagnostic System
  • T&P Relief Valve
  • Installation Manual

Standard Features
  • High Density Insulation
  • Multi-Flue Design
  • Clean Out & Inspection Port
  • Multi-Port Efficient Burners with Slide Out Tray for Easy Inspection
  • Blue Cobalt Glass Lined
  • Type B Venting
  • 5-Year Limited Warranty if Registered Online

Optional Equipment
  • Power vent and aluminum vent hood mounts on outside of wall. Rust-Free construction, condensate shield, heat shield, mounting hardware

  • 5-Year Limited Warranty.

Models of 125,000 and 150,000 Btuh and their derated versions can also use a 1/2" gas connection.


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·  Kits Available for HTP® Heavy Duty Commercial Gas Fired Water Heaters


Brochure for HTP® Heavy Duty Commercial Gas Fired Water Heaters
(PDF, 859KB)