Modine PTP 250 Low-Profile Tubular Unit Heater — 250,000 BTU/hr Natural Gas Power Vented Stainless Steel

Commercial-Grade Heat for Large Indoor Growing Facilities — Modine PTP 250 Unit Heater

The Modine® PTP 250 Low-Profile Tubular Unit Heater delivers 250,000 BTU/hr of reliable, efficient heat for large indoor cultivation facilities, warehouses, and commercial growing spaces. Engineered for up to 83% thermal efficiency, the PTP 250 provides consistent, powerful heating in a compact low-profile design that keeps installation straightforward and minimizes overhead footprint in grow rooms, greenhouses, and multi-bay facilities.

Built with a stainless steel heat exchanger and stainless steel burner for corrosion resistance in humid growing environments, the PTP 250 features a factory-installed power exhauster and horizontal power venting system that supports simplified installation with small-diameter pipe. Direct spark ignition with 100% shut-off and continuous retry provides dependable startup reliability, while the permanently lubricated motor reduces ongoing maintenance requirements. ETL certified for commercial and industrial use in the United States and Canada.

Key Features & Benefits

• 250,000 BTU/hr heat output — delivers high-capacity heating suitable for large grow rooms, commercial greenhouses, and multi-bay cultivation facilities.
• Up to 83% thermal efficiency — maximizes heat output per unit of fuel for cost-effective operation in continuously heated grow environments.
• Stainless steel heat exchanger and burner — provides superior corrosion resistance in the high-humidity conditions of active indoor cultivation facilities.
• Factory-installed power exhauster — simplifies installation with horizontal venting through small-diameter pipe, reducing setup complexity and cost.
• Field-convertible to propane — flexibility to switch fuel source in the field without returning the unit for factory modification.
• 10-year heat exchanger warranty — reflects the long-term durability and build quality of the stainless steel heat exchanger.
• Permanently lubricated motor — reduces maintenance intervals and supports reliable, long-term continuous operation.
• ETL certified — tested and certified for commercial and industrial use in the United States and Canada.

Who Should Use the Modine PTP 250 Unit Heater

The PTP 250 is the heating solution for large-scale indoor cultivators, commercial greenhouse operators, and facility managers who need reliable, high-output heating that can withstand continuous operation in humid growing environments. It is particularly suited to multi-room facilities, large single-bay grow spaces, and operations in cold climates where maintaining consistent ambient temperatures through winter months is critical to crop performance and equipment protection.

Reliable Heating for Year-Round Indoor Cultivation

Consistent ambient temperature is a foundational requirement for stable growing environments — cold spots, temperature swings, and inadequate heating capacity all create variability that affects crop quality, VPD management, and disease susceptibility. The Modine PTP 250's high BTU output and efficient combustion design ensure that large cultivation spaces maintain stable, programmable temperature setpoints regardless of outdoor conditions, giving cultivators the environmental consistency that commercial-grade crop production demands.

Frequently Asked Questions

What fuel type does the PTP 250 use, and can it run on propane?

The PTP 250 ships configured for natural gas. It is field-convertible to propane without factory modification, providing fuel flexibility for facilities without natural gas infrastructure.

What is the thermal efficiency of the PTP 250?

The PTP 250 achieves up to 82-83% thermal efficiency, meaning the majority of fuel energy is converted to usable heat output, reducing operating costs compared to lower-efficiency units.

What power supply does the PTP 250 require?

The PTP 250 operates on a standard 115V/60Hz single-phase power supply for the blower motor and controls. Natural gas or propane supply is required for combustion.

Is the PTP 250 suitable for high-humidity grow environments?

Yes. The stainless steel heat exchanger and burner are specifically chosen for their corrosion resistance in humid environments. The PTP series is rated for commercial and industrial use including applications with elevated humidity levels.

What is covered by the 10-year heat exchanger warranty?

Modine provides a 10-year limited warranty on the heat exchanger, reflecting confidence in the stainless steel construction's durability. Refer to Modine's warranty documentation for full terms and conditions.