Lochinvar CWN500PM-F9 Commercial Gas Water Heater 500K Btu

Product Description

The LOCHINVAR CWN500PM-F9 is a copper-fin atmospheric gas commercial water heater rated at 500,000 BTU/h input. It uses an intermittent spark ignition firing control (F9 configuration) and a copper finned tube heat exchanger to transfer heat efficiently while reducing the risk of leaks. The unit operates on 120 volts and is designed for high-demand commercial hot water applications where a separate storage tank is paired with the heater for full system performance. A factory-installed ASME temperature and pressure relief valve ships with the unit. Licensed plumbers and commercial HVAC technicians are the primary installers for this equipment.

This water heater is built for commercial installations that require a reliable atmospheric vent configuration. The built-in draft hood accommodates limited overhead clearance, and the front-sliding heat exchanger design provides direct access for routine service. The Loch-Heat ceramic tile lining reduces overall unit weight compared to conventional linings. With a water flow rate of 30 GPM and a recovery rate of 693 gallons per hour at a 70 degrees F rise, the CWN500PM-F9 is suited for hotels, schools, laundries, and similar high-volume commercial facilities. Max working pressure is 160 psi and max water hardness is 25 grains.

Key Features

• 500,000 BTU/h input rating for high-demand commercial hot water generation
• Copper finned tube heat exchanger with 52.1 square feet of heating surface reduces leak risk and inhibits lime scale buildup
• F9 intermittent spark ignition firing control — standard on CW 315-500 series units
• Built-in draft hood designed for installations with limited overhead clearance
• Factory-installed ASME-rated temperature and pressure relief valve (rated at 1,912 MBH, 150 psi, 210 degrees F)
• Front-sliding heat exchanger allows quick component access without full disassembly
• Ceramic tile lining (Loch-Heat) reduces overall unit weight by approximately 25 percent versus conventional designs

Compatibility

The CWN500PM-F9 uses the F9 intermittent spark ignition firing control, which is standard for the Lochinvar CW 315-500 series copper-fin atmospheric water heaters. This unit pairs with a separate storage tank as part of a complete commercial hot water system.

Installation Notes

Installation must be performed by a licensed plumber or qualified commercial HVAC technician in accordance with local plumbing codes and the applicable fuel gas code (IFGC or local equivalent). Shut off the gas supply and disconnect electrical power at the circuit before beginning any service or replacement work. The vent connection requires a 10-inch vent pipe; verify clearances and vent material ratings before connecting. Water connections are 2 inches and the drain connection is 3/4 inch — confirm existing piping sizes match before installation.

Technical Specifications

• BTU/h Input: 500,000 BTU/h
• Firing Control: F9 Intermittent Spark Ignition
• Voltage: 120 volts
• Water Flow Rate: 30 GPM
• Recovery Rate at 70 degrees F Rise: 693 GPH
• Recovery Rate at 100 degrees F Rise: 485 GPH
• Recovery Rate at 140 degrees F Rise: 346 GPH
• Max Working Pressure: 160 psi
• Max Water Hardness: 25 grains
• Heating Surface: 52.1 square feet
• Head Loss: 7 feet of head
• Gallon Capacity (unit vessel): 1.2 gallons
• Gas Inlet Connection: 1 inch
• Water Connection: 2 inches
• Drain Connection: 3/4 inch
• Vent Size: 10 inches
• Relief Valve Size: 3/4 inch
• Relief Valve Pressure Rating: 150 psi
• Relief Valve Temperature Rating: 210 degrees F
• Relief Valve Rating: 1,912 MBH
• Number of Relief Valves: 1
• Width (including pump): 62.25 inches
• Height: 34.5 inches
• Depth: 22 inches

Standard Information

• Brand: LOCHINVAR
• Manufacturer Part Number: CWN500PM-F9