LB White Tradesman 400 Ultra Portable Forced Air Heater with Diagnostic Light - Propane Gas

High-Output Heating 400,000 BTU Portable Propane Heater for Construction & Industrial Applications with Self-Diagnostic Service Saver Technology

The L.B. White Tradesman® 400 Ultra is a commercial-grade portable forced-air propane heater designed to provide high-output supplemental heating for construction sites, industrial facilities, and other suitable temporary-heating environments. Delivering adjustable heating input from 250,000 to 400,000 BTU/h, this direct-fired heating system combines electronic spark ignition, thermostatic temperature control, and 1,050 CFM heated-air output to support demanding heating requirements. Its Self Diagnostic Service Saver system with an illuminated diagnostic light helps simplify troubleshooting, while the heavy-gauge combustion chamber and Tri-Shield™ coated steel case provide durability for demanding work environments. Variable heat output supports flexible temperature management and fuel use wherever an approved propane supply, compatible electrical connection, and adequate ventilation are available.

Key Benefits

• 400,000 BTU/h Maximum Heating Capacity – Provides adjustable heating input from 250,000 to 400,000 BTU/h to accommodate changing supplemental heating demands.
• Direct-Fired Propane Heating Technology – Transfers combustion heat directly into the heated airstream, with manufacturer-stated direct-fired fuel efficiency of 99.97%.
• Self Diagnostic Service Saver System – Integrated diagnostics and an illuminated LED diagnostic light help identify operating issues and support troubleshooting.
• 1,050 CFM Heated-Air Output – Circulates heated air at a rated output of 1,050 CFM to distribute warmth toward the intended work area.
• Variable Heat Output – Adjustable heating capacity helps match heat delivery to site conditions and manage propane consumption.
• Thermostatic Temperature Control – Helps regulate heating operation according to the selected temperature setting.
• Durable Construction – Heavy-gauge combustion chamber and burner plate construction, combined with a Tri-Shield™ coated steel case, support durability in demanding work environments.
• Electronic Spark Ignition & Safety Controls – A three-trial ignition system, airflow safety switch, and high-temperature limit switch support controlled operation and troubleshooting.

400,000 BTU/h Heating Performance

The L.B. White Tradesman® 400 Ultra provides adjustable heating input from 250,000 to 400,000 BTU/h for high-output supplemental heating in suitable construction and industrial environments. Its forced-air system delivers a rated heated-air output of 1,050 cubic feet per minute (CFM), helping distribute warmth throughout the intended work area. Variable-output operation allows the heater to operate at a reduced heating input when full capacity is unnecessary, supporting flexible temperature management and fuel consumption. Actual heating performance and coverage depend on ambient temperature, building construction, ventilation, air infiltration, and other site conditions.

Direct-Fired Propane Heating Technology

The L.B. White Tradesman® 400 Ultra uses direct-fired forced-air heating technology powered by propane vapor withdrawal. The burner heats the air directly, and the integrated fan distributes the heated airstream into the surrounding area. L.B. White specifies direct-fired fuel efficiency of 99.97%. The system provides high-output heat without an indirect-fired heat exchanger. Because combustion products enter the heated airstream, adequate ventilation is essential. This heater is intended for temporary construction heating and must not be used to heat human living quarters or in unventilated areas. Operate the unit only in applications permitted by the manufacturer's instructions and applicable safety requirements.

1,050 CFM Airflow & Heat Distribution

The L.B. White Tradesman® 400 Ultra provides a rated heated-air output of 1,050 CFM. Its integrated fan circulates heated air toward the intended work area, supporting supplemental heating in suitable construction and industrial environments. This forced-air configuration helps distribute warmth beyond the immediate burner area. Keep the air intake and discharge openings unobstructed during operation, maintain the manufacturer's specified clearances from combustible materials, and do not connect ductwork to the heater. Proper airflow is essential for safe operation and effective heat distribution.

Portable Design & Flexible Installation

The L.B. White Tradesman® 400 Ultra features a portable, self-contained heater assembly designed for temporary deployment in suitable work areas. Manufacturer-published dimensions for the Tradesman 400 series are approximately 34.2 inches long, 12.5 inches wide, and 21.7 inches high, with a standard-model net weight of approximately 51 lb. The Ultra model's exact weight should be confirmed against the applicable product documentation. The heater requires a compatible propane supply, the manufacturer-specified regulator and hose arrangement, and a grounded electrical supply for fan and ignition operation. Position the unit on a stable surface, maintain the required clearances, and follow the manufacturer's instructions for fuel connections, electrical supply, startup, and shutdown.

Propane Fuel & Energy Management

The L.B. White Tradesman® 400 Ultra operates on propane vapor withdrawal, with published fuel consumption ranging from approximately 11.6 lb/h at minimum output to 18.6 lb/h at maximum output. The manufacturer specifies a propane inlet pressure of 5.2 PSIG at the heater connection. Variable-output operation allows the heater to reduce its heating input when full capacity is not required, helping manage fuel consumption. The unit requires a 115 V, 60 Hz, single-phase electrical supply according to L.B. White's published product literature. The manufacturer lists starting and continuous operating current values of 4.0 A and 1.5 A, respectively, in its Tradesman series specification sheet. Verify the exact electrical requirements, gas pressure, regulator, hose, and fittings against the current owner's manual and heater nameplate before installation. Use only the approved propane configuration; the standard Tradesman 400 Ultra is not a natural gas-convertible model.

Controls, Temperature Management & Electrical Connection

The L.B. White Tradesman® 400 Ultra incorporates thermostatic temperature control to regulate heating operation according to the selected setting. Its electronic ignition system provides three ignition trials, while the Self Diagnostic Service Saver system uses an illuminated LED diagnostic light to support troubleshooting. An integrated fan circulates heated air, and airflow and high-temperature safety controls help monitor operating conditions. The manufacturer's series specification sheet lists a 115 V, 60 Hz, single-phase electrical supply, with starting current of 4.0 A and continuous operating current of 1.5 A. Confirm the exact voltage, plug configuration, grounding, circuit capacity, and power connection requirements against the current owner's manual and unit nameplate before operation.

Commercial, Construction & Industrial Applications

The L.B. White Tradesman® 400 Ultra is designed for temporary supplemental heating in suitable construction and industrial environments. Its maximum heating input of 400,000 BTU/h, 1,050 CFM heated-air output, and variable-output operation support applications requiring high-capacity temporary heat. L.B. White identifies the Tradesman series for construction, industrial, and agricultural applications. The Ultra model's diagnostic system provides additional troubleshooting support for demanding work environments. Because this is a direct-fired propane heater, its application must provide the ventilation required by the manufacturer and comply with applicable fuel-gas regulations and site safety procedures. It must not be used in human living quarters or unventilated spaces.

Mobility & Deployment

The L.B. White Tradesman® 400 Ultra uses a portable construction intended for deployment between suitable work areas. The Tradesman 400 series measures approximately 34.2 inches long, 12.5 inches wide, and 21.7 inches high. Its self-contained design supports temporary installation wherever compatible propane and electrical supplies are available. Position the heater securely on a stable surface, maintain the specified clearances from combustible materials, and arrange fuel and electrical connections to prevent damage or interference. Disconnect the propane and electrical supplies as directed before moving, inspecting, or servicing the heater. Allow hot components to cool before handling.

Safety, Service & Maintenance

The L.B. White Tradesman® 400 Ultra incorporates electronic spark ignition with three ignition trials, a Self Diagnostic Service Saver system with an illuminated diagnostic light, an airflow safety switch, and a high-temperature limit switch. These features support controlled operation, operating-condition monitoring, and troubleshooting. Its heavy-gauge combustion chamber and burner plate are designed for demanding work environments, while the Tri-Shield™ coated steel case helps resist abrasion and corrosion. L.B. White identifies the Tradesman construction heater series as CSA certified for the United States and Canada. Inspect the heater, electrical cord, propane hose, regulator, and gas fittings before each use. Check gas connections for leaks using an approved leak-detection procedure, provide adequate ventilation, and maintain all specified clearances from combustible materials. Keep the air intake and discharge unobstructed, never bypass safety devices, and do not operate damaged equipment. Do not connect ductwork to the heater. Cleaning, maintenance, and gas-system servicing must follow the current owner's manual and be performed by appropriately qualified personnel.

Warranty

Warranty coverage for the L.B. White Tradesman® 400 Ultra should be confirmed directly with L.B. White or an authorized dealer before purchase. Refer to the applicable written manufacturer warranty for coverage duration, exclusions, registration requirements, and any installation, operation, or maintenance conditions that apply to the specific model. Warranty eligibility may depend on compliance with the manufacturer's instructions and the use of approved components and installation procedures.

Recommended Accessories

• Manufacturer-Specified Propane Regulator – Use the regulator approved for the Tradesman® 400 Ultra and compatible with the specified propane inlet pressure and required fuel flow.
• Propane Hose & Connection Assembly – Use a manufacturer-approved hose and compatible fittings suitable for the heater's fuel requirements and installation configuration.
• Propane Supply Components – Provide an appropriately sized propane supply capable of supporting maximum fuel consumption of approximately 18.6 lb/h. L.B. White recommends sizing the supply for the heater's fuel demand and expected operating duration.
• Electrical Power Connection Components – Use a compatible, properly grounded electrical supply that meets the exact voltage, frequency, current, and plug requirements stated on the heater nameplate.
• Diagnostic & Replacement Components – Verify compatibility of the LED diagnostic light, ignition components, airflow safety switch, high-temperature limit switch, and other replacement parts through official L.B. White parts diagrams and service documentation.
• Manufacturer-Approved Replacement Parts – Confirm model and configuration compatibility through L.B. White or an authorized service provider before ordering replacement components.

High-Output Portable Heating with the L.B. White Tradesman® 400 Ultra

Experience dependable supplemental heating with the L.B. White Tradesman® 400 Ultra Portable Forced-Air Propane Heater. Combining adjustable heating input from 250,000 to 400,000 BTU/h with 1,050 CFM heated-air output, thermostatic temperature control, electronic spark ignition, and the Self Diagnostic Service Saver system, this portable heater provides high-capacity warmth for suitable construction and industrial applications. Its variable-output heating technology, durable Tri-Shield™ finish, and illuminated diagnostic light support flexible deployment and convenient troubleshooting wherever temporary propane-fired heating is appropriate and the required fuel supply, electrical connection, ventilation, and safety clearances are available.