Modine PTP300 Horizontal Power-Vented Natural Gas Unit Heater - 300,000 BTU, 115V, Aluminized Steel

300,000 BTU Commercial Natural Unit Heater With 4,545 CFM, 69-Foot Heat Throw, And 19-Foot Mounting Height

The Modine PTP300 (PTP300AS0111) is a 300,000 BTU commercial gas unit heater engineered for large commercial and industrial spaces. At 300,000 BTU input and 249,000 BTU output (83% efficiency), it pushes 4,545 CFM with a 50°F temperature rise and throws heat 69 feet from a maximum mounting height of 19 feet. The 1/2 HP motor drives an 824 FPM outlet velocity through a 22-inch propeller fan, covering large open floor plans that require high-volume air delivery.

The PTP300 is a 300,000 BTU commercial unit heater built on the same 6-inch vent and 3/4-inch gas infrastructure as the rest of the PTP 250-400 range. It features a tubular heat exchanger with in-shot burners, a 20-gauge aluminized steel cabinet, in-cabinet controls protection, and a contractor convenience box with diagnostic LEDs. The 409 stainless steel heat exchanger option carries a 10-year warranty that includes greenhouse use.

Quick Specs

• BTU Input: 300,000

• BTU Output: 249,000 (83% efficiency)

• Airflow: 4,545 CFM at 70°F

• Supply Voltage: 115V, 1-Phase, 60 Hz

• Vent Size: 6 inch

• Gas Connection: 3/4 inch

• Maximum Mounting Height: 19 ft

• Heat Throw: 69 ft at max mounting height

• Dimensions (D x W x H): 33.83 x 42.53 x 31.31 inches

• Weight: 270 lbs

Key Features

• 300,000 BTU with 4,545 CFM and 69-foot throw: This 300,000 BTU commercial gas unit heater delivers 249,000 BTU of usable output across expansive floor plans. The 69-foot heat throw from a 19-foot mounting height reaches the far corners of warehouses, factories, and industrial bays.

• 1/2 HP motor: The PTP300 unit heater uses a 1/2 HP PSC motor at 1,075 RPM, driving 4,545 CFM through a 22-inch propeller fan at 824 FPM outlet velocity. This is the motor tier for high-volume air delivery across large open spaces.

• 6-inch power-vented exhaust: Factory-installed power exhauster handles horizontal vent runs up to 70 feet. 6-inch vent pipe with 3/4-inch gas connection.

• Tubular heat exchanger with in-shot burners: Each heat exchanger tube has its own in-shot burner for consistent combustion and heat transfer. This design extends exchanger life and improves efficiency over drum-style exchangers.

• 409 stainless steel heat exchanger available: Standard aluminized steel handles most commercial environments. The stainless option (PTP300SS0111) is rated for greenhouses, agricultural buildings, and corrosive atmospheres. Both carry a 10-year warranty.

• In-cabinet controls protection: Controls, power exhauster, and ignition components are sealed inside the cabinet, shielded from dust, moisture, and debris in harsh commercial environments.

• Contractor convenience box: On/off toggle switch, green power indicator, yellow call-for-heat indicator, terminal board for low-voltage wiring, and conduit knockouts. Diagnostic LEDs for on-site troubleshooting.

• Low-profile horizontal design: Ceiling or wall mount. The 42.53-inch width fits standard commercial joist spacing.

• Field convertible to propane: Ships natural gas. Propane conversion available per Modine Manual 75-515. Natural gas consumption: 285.7 CFH at 3.5" W.C.

• Cold climate rated: Starts at -40°F. ETL certified for commercial and industrial use in the US and Canada. CSA-B149.1 compliant.

Modine PTP300 Natural Gas Commercial Unit Heater Specifications

Available Options

Fuel Type:

• Natural Gas (standard)

• Propane (field convertible per Modine Manual 75-515)

Ignition Type:

• Single-Stage, Direct Spark Ignition, 100% Shut-Off with Continuous Retry (standard)

• Two-Stage, Direct Spark Ignition (optional, fires at 100% and 50% of rated input)

Heat Exchanger Material:

• Tubular, Aluminized Steel (standard, this model: PTP300AS0111)

• Tubular, 409 Stainless Steel (optional, model: PTP300SS0111, rated for greenhouses and corrosive environments)

Fan Configuration:

• Propeller Fan (PTP series, this model)

• Centrifugal Blower Fan (BTP series, for ducted applications)

Performance Overview

The PTP300 unit heater delivers 4,545 CFM at a 50°F temperature rise with an 824 FPM outlet velocity, producing 249,000 BTU of usable heat output. From its 19-foot maximum mounting height, it throws heat 69 feet across the floor. The 1/2 HP motor and 22-inch propeller fan handle the air volume that large warehouses, distribution centers, and factory floors demand. 

As a 300,000 BTU natural gas power vented industrial heater, the PTP300 operates on a 6-inch vent pipe with horizontal runs up to 70 feet and a 3/4-inch gas connection. The 300,000 BTU commercial unit heater is rated for spaces approximately 8,000 to 10,000+ square feet, depending on insulation, ceiling height, and climate zone.

Included with the PTP300

• Adjustable horizontal air deflector blades

• Factory-installed power exhauster (6-inch)

• Contractor convenience box (toggle switch, diagnostic LEDs, terminal board)

• Gas control step-down transformer (24V)

• Fan delay timer

• Auto-reset limit control

• Differential pressure switch (proof of venting)

• Installation and service manual

Not included (sold separately):

• Vent pipe and fittings (6-inch diameter required)

• Vent cap (Modine PN 5H0722850002 for PTP250-400)

• Thermostat (any standard 24V thermostat)

• Propane conversion kit (per Modine Manual 75-515)

• Gas supply piping and shutoff valve (3/4-inch)

• Deflector hoods (30, 60, and 90-degree available)

• Vibration isolation kit

• Two-point suspension kit

Applications

• Large warehouses and distribution centers (8,000 to 10,000+ sq ft)

• Manufacturing floors and factory bays

• Greenhouses and agricultural buildings (stainless steel heat exchanger recommended)

• Auto dealership service departments and fleet garages

• Aircraft hangars (minimum 10 ft above the highest wing or engine surface)

• Loading docks, freight terminals, and cold storage staging areas

• Fire stations, transit maintenance facilities, and municipal buildings

Installation Tips

• Commercial and industrial use only. The PTP series is ETL certified for commercial and industrial applications. It is not certified for residential use.

• 6-inch vent pipe and 3/4-inch gas required. Same infrastructure as the PTP250. If you are upgrading from a PTP250, no vent or gas line changes are needed.

• Max 70-foot horizontal vent run. Each 90-degree elbow adds equivalent length. Minimum 3-foot vent run required.

• 270 lbs shipping weight. Plan for appropriate rigging and ceiling structure support. Two-point suspension kit available as an accessory.

• High altitude derating. For elevations above 2,000 feet, reduce ratings by 4% per 1,000 feet above sea level.

• Clearances: 6 inches on all sides (top, bottom, access, non-access). 18 inches at the rear. Minimum 7-foot install height from floor. In aircraft hangars, a minimum of 10 feet above the highest wing or engine surface.

Buy the Modine PTP300 Commercial Gas Unit Heater Online from Cleanflow

The PTP300 is a 300,000 BTU commercial gas unit heater with the output, airflow, and throw distance to handle large warehouses and industrial facilities. The 1/2 HP motor, 4,545 CFM airflow, and 69-foot heat throw cover floor areas that most commercial heaters in this class cannot reach from a single unit. The tubular heat exchanger with in-shot burners, in-cabinet controls protection, and a 10-year warranty (including greenhouse use) is standard. 

Cleanflow Utility Supply Company stocks the PTP300 unit heater with free shipping on orders over $199 CAD across Canada and the USA. As an authorized Modine supplier, Cleanflow backs every unit with manufacturer warranty support. 

Not the right fit? Cleanflow offers hassle-free returns and exchanges on all orders.

Frequently Asked Questions

How many square feet will the PTP300 heat?

At 300,000 BTU input (249,000 BTU output), the PTP300 unit heater handles approximately 8,000 to 10,000+ square feet, depending on insulation, ceiling height, and climate zone. The 69-foot heat throw from a 19-foot mounting height covers large open floor plans. For buildings over 10,000 square feet, multiple units or a larger PTP model may be needed.

What are the PTP300's advantages over other 300,000 BTU heaters?

The PTP300 unit heater features a tubular heat exchanger with in-shot burners, in-cabinet controls, protection that seals wiring and ignition components from dust and moisture, a contractor convenience box with diagnostic LEDs, and a 409 stainless steel heat exchanger option with a 10-year warranty, including greenhouse use. It is designed, engineered, and assembled in the USA. These are verifiable specs from Modine's product documentation.

Does the PTP300 require a 6-inch vent pipe?

Yes. The PTP300 unit heater uses a 6-inch vent pipe and a 3/4-inch gas connection with a maximum horizontal vent run of 70 feet. If you are upgrading from a PTP250, the same vent pipe and gas line work.

Can the PTP300 commercial unit heater run on propane?

Yes. Ships natural gas. Field convertible to propane per Modine Manual 75-515. Propane consumption is 3.3 gallons per hour at 10" W.C. manifold pressure. The unit uses 9 orifices; drill size changes from #39 (NG) to 1.55mm (LP).

Is the PTP300 unit heater rated for cold climates like Canada?

Yes. Starts at -40°F. ETL certified for commercial and industrial use in the US and Canada. CSA-B149.1 compliant. At 300,000 BTU input, it provides substantial heating for large commercial and industrial spaces in extreme cold. For elevations above 2,000 feet, derate by 4% per 1,000 feet.