L.B. White Tradesman 400 Ultra DF | 250,000 - 400,000 BTU/Hr | LP/NG | w/ Diagnostic Light GWG311070

The L.B. White Tradesman® 400 Ultra DF delivers massive heating power with 400,000 BTU/hr of high-efficiency, direct-fired heat using either liquid propane (LP) or natural gas (NG). Built for large-scale commercial and industrial applications, this dual-fuel heater offers maximum flexibility, rugged steel construction, and 99% fuel efficiency. With an enclosed flame, integrated thermostat, and heavy-duty portability, the Tradesman 400 Ultra DF is the ultimate solution for heating warehouses, construction sites, and other demanding environments.

How The L.B. White Tradesman 400 Ultra DF Compares To Other L.B. White Heating Options

Contractors evaluating direct-fired portable heaters usually face this question: should I get the self-contained Tradesman K210 for job sites without gas, the moderate-output Premier 170 DF 2.0, or this variable-output Tradesman 400 Ultra DF for maximum flexibility and BTU range?

Here's the honest comparison:

Why The L.B. White Tradesman 400 Ultra DF Is Worth The Investment

This isn't just a heater, it's built with a variable rate valve and built-in thermostatic control letting it run anywhere from 250,000 to 400,000 BTU per hour, giving contractors the flexibility to dial in exactly the heat output needed for the space while conserving fuel, all backed by the industry's heaviest gauge combustion chamber and burner plate.

The Tradesman 400 Ultra DF specifically addresses the needs of contractors who need the highest BTU range available in the L.B. White Tradesman line, along with genuine fuel-saving flexibility and built-in diagnostic support for troubleshooting.

Maximum Output Range, Built To Save Fuel. Unlike fixed-output heaters that run at a single BTU rating, this heater's variable rate valve and thermostatic control let you scale output anywhere from 250,000 to 400,000 BTU per hour, meaning you're not burning fuel at maximum output when a smaller space only needs moderate heat.

Built For Serious, Adjustable Heating Power

The variable rate valve and thermostatic control allow output to be dialed in from 250,000 to 400,000 BTU per hour

Delivers up to 1,582 CFM of heated air at full output for fast, effective space heating

Dual-fuel operation switches between propane and natural gas with the simple turn of a selector valve

Engineered For Rugged Durability And Easy Troubleshooting

The industry's heaviest gauge combustion chamber and burner plate stand up to demanding daily use

The unique 3-trial ignition system with Self-Diagnostic Service Saver diagnostic light streamlines troubleshooting

The Tri-shield coated case protects against abrasion and corrosion across repeated job site deployments

Real Savings

Variable output reduces fuel consumption compared to running a fixed-output heater at maximum capacity for smaller spaces

The diagnostic light reduces service call time and downtime by pinpointing issues quickly

A 2-year warranty with lifetime technical support reduces the risk of unexpected repair costs

Free shipping and no sales tax through Summit Forge Supply keeps the total cost down compared to buying elsewhere and paying tax and freight separately

The Bottom Line Contractors who need maximum heating flexibility across a wide BTU range, along with rugged combustion chamber construction and built-in diagnostics, can't get that combination from a fixed-output heater. The L.B. White Tradesman 400 Ultra DF is built with a variable 250,000-400,000 BTU output range, the industry's heaviest gauge combustion chamber, and self-diagnostic troubleshooting support, so it delivers adjustable, fuel-conscious heating power for demanding job sites. For anyone needing to dial in the right amount of heat for varying space sizes, this is the heater built to scale with the job.

• 400,000 BTU/hr output delivers high-capacity heating for large jobsite and industrial spaces
• Dual-fuel capability (LP or NG) offers fuel flexibility for changing jobsite needs
• 99% fuel efficiency ensures clean, cost-effective heat with minimal emissions
• Enclosed flame design enhances safety and supports consistent heat delivery
• Integrated thermostat provides adjustable, precise temperature control
• Spark ignition system ensures fast, reliable startups every time
• Rugged powder-coated steel housing withstands harsh jobsite conditions
• Durable frame with handle and wheel kit options for improved mobility
• Ideal for construction sites, agricultural applications, tent heating, and rental fleets