Flagro FVNP-400 Propane/Natural Gas Indirect Fired Heater | 390,000 BTU/h, Ductable Up to 150 ft, with Smart Control and Ultra-Quiet Operation

The Flagro FVNP-400RC: High-Performance 390,000 BTU Indirect-Fired Heater for Demanding Job Sites

Meet the Flagro FVNP-400RC, a powerful 390,000 BTU indirect-fired heater designed for maximum performance, efficiency, and adaptability. Built for professionals, this unit delivers clean, dry heat ideal for construction sites, maintenance facilities, event spaces, and industrial work zones. With dual-fuel flexibility, choose between propane or natural gas to suit your job site's energy requirements.

From protecting sensitive materials against freezing temperatures to accelerating drying times in large spaces, this dual-fuel indirect heater ensures consistent performance, reduced emissions, and safe operation in enclosed or semi-enclosed environments. Its robust design, stainless steel heat exchanger, and ultra-quiet blower system make it a reliable solution for high-capacity, ductable heat up to 150 feet.

Why Choose the Flagro FVNP-400RC?

High-Efficiency Indirect Heat — 390,000 BTU/hr

With a massive 390,000 BTU/hr heat output, the FVNP-400RC delivers clean, breathable heat without introducing combustion byproducts into your space.

Dual-Fuel Flexibility: Propane or Natural Gas

Designed with a manual selector valve, this unit quickly switches between propane and natural gas for unmatched adaptability on job sites.

Proven Riello Burner System

Engineered with a nozzle pre-heater for cold-weather startup and an upgraded low-temperature fuel pump, ensuring reliable operation even in sub-zero environments.

Low Power Draw with Smart Control

Draws just 10.5 AMPs on 115V, yet powers a 3/4 HP fan motor with 2,500 CFM output. The Smart Power Indicator Control system and built-in volt meter provide power integrity checks in real time.

Durable & Built to Move

• Welded 304 Stainless Steel Heat Exchanger ensures lasting performance and corrosion resistance.
• High-Density Flat-Free Wheels (16") ensure smooth mobility.
• Forklift pockets for effortless transport.

Specifications

Applications

This Flagro indirect-fired heater is ideal for:

• Construction heating during winter builds
• Concrete curing and drying
• Disaster relief & emergency heat deployment
• Tent & outdoor event heating
• Industrial dehumidification
• Military and mining camps

No fumes, no moisture, no worries — just powerful, clean heat from a trusted Canadian manufacturer.

How Is This Different From Other Flagro Heaters?

Unlike the Flagro FVO-400RC (which runs on diesel and oil), the FVNP-400RC offers dual-fuel capability and cleaner emissions with propane and natural gas. Its lower operating cost, ease of refueling, and reduced exhaust handling make it ideal for indoor or semi-enclosed applications.

It’s also easier to service, thanks to the accessible burner housing and smart diagnostics system.

Why Professionals Trust Flagro Heaters

Flagro is a leading name in indirect-fired heaters, and the FVNP-400 is a prime example of engineering excellence:

• Trusted Riello burner system
• North American manufacturing since 1978
• Certified to meet cETLus safety standards
• Rugged construction for demanding environments

Why Choose Flagro Heaters from Cleanflow?

Cleanflow proudly carries a wide range of Flagro indirect-fired heaters known for their Canadian-built durability, safety, and jobsite adaptability. The FVNP-400 stands out as a top choice for professionals needing a dependable dual-fuel propane heater that can perform in extreme cold without compromising air quality.

Unlike diesel-powered units, this propane/natural gas heater offers clean operation with no diesel odor—ideal for tents, events, or work zones where air purity matters.

Order the Flagro FVNP-400 Today from Cleanflow

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Frequently Asked Questions

Is 390,000 BTU/hr enough for construction sites or warehouses larger than 5,000 sq ft?

Yes. The FVNP-400RC delivers up to 390,000 BTU/hr of indirect-fired heat, making it suitable for large open or semi-enclosed areas such as warehouses or job sites over 5,000 sq ft. However, it depends on building insulation, ceiling height, ventilation loss, and climate conditions, so evaluate your specific heat load.

What is the air circulation (CFM), and how does it impact heating speed?

According to specs, the FVNP-400 series has a blower rated around 2,500 CFM (for the non-RC model). Higher airflow means faster distribution of warm air, more even coverage, and quicker warming of large spaces. So a higher CFM helps speed up heating and reduce cold spots.

How easy is it to access internal components for maintenance?

The unit is designed for serviceability: the manufacturer notes “improved maintenance accessibility” in the spec sheet. This means internal components like burner housing, fuel lines, and electrical controls are designed to be accessible, which helps reduce downtime and service costs.

Can this heater be used with a generator-powered setup?

Yes. Provided the generator can supply the required power. The FVNP-400 series requires standard 115 V / 15 AMP power. Ensure your generator’s output is stable and meets voltage/amperage requirements (including surge/start-up draw) to avoid interruptions.

Is the FV-THB remote thermostat compatible and plug-and-play?

Yes. The spec sheet lists remote thermostat option FV-THB for the FVNP-400 model. So you can add that remote thermostat to enable temperature control from a distance; plug-and-play style compatibility is implied.

How large an area can the 390,000 BTU Flagro FVNP-400RC effectively heat?

While the manufacturer doesn’t state a specific square-footage coverage, many resellers list up to ~8,000 sq ft for the 390,000 BTU unit. As a rule, consider insulation, ceiling height, ventilation, and temperature difference. For very large spaces or extreme conditions, more than one unit may be required.