Maximum Heating Power for Commercial, Agricultural & Multi-Building Applications

The Royall 6490 Outdoor Wood Boiler is the largest and most powerful outdoor sheltered wood boiler in the Royall lineup. Designed for demanding commercial, agricultural, industrial, and large-scale residential applications, the 6490 delivers up to 490,000 BTU of heating capacity while providing the durability and reliability Royall boilers are known for.

Featuring a massive 50 cubic foot firebox, dual forced draft fans, and a fully insulated outdoor shelter, the Royall 6490 is built to provide dependable hydronic heat for facilities exceeding 10,000 square feet.

Commercial-Grade Heating Performance

When heating large buildings or multiple structures, consistent heat output is essential. The Royall 6490 is engineered to handle substantial heating loads while maintaining efficient wood-fired operation throughout the winter season.

Ideal applications include:

• Commercial buildings
• Agricultural facilities
• Warehouses
• Manufacturing shops
• Multi-building properties
• Large residential estates
• Equipment storage facilities
• Greenhouses
• Municipal buildings

Whether serving as a primary heating source or supplementing an existing system, the 6490 provides the capacity needed for demanding heating environments.

Massive Firebox Capacity

The Royall 6490 features an enormous 50 cubic foot firebox capable of accepting logs up to 56 inches long. This oversized design allows operators to load larger wood quantities, helping reduce loading frequency and minimize firewood processing requirements.

Firebox Benefits

• 50 cubic foot firebox capacity
• Accepts logs up to 56 inches long
• Extended burn times
• Reduced loading frequency
• Less wood cutting and processing
• Ideal for commercial heating demands

Dual Forced Draft Combustion System

To support its exceptional heating capacity, the 6490 utilizes two 146 CFM forced draft fans working together to provide consistent combustion airflow beneath the cast iron rocker grate system.

This advanced draft induction design helps maximize combustion efficiency and heat transfer while maintaining stable boiler temperatures.

Combustion Features

• Dual 146 CFM forced draft fans
• Automatic damper shutoff
• 16-piece cast iron rocker grate system
• Full firebrick-lined combustion chamber
• Bottom-up combustion technology
• Pressurized boiler design

Built for Long-Term Reliability

The Royall 6490 is constructed using heavy-duty 1/4-inch and 5/16-inch steel boiler plate designed to withstand years of continuous operation. The outdoor shelter protects the boiler from weather exposure while allowing convenient access for loading and maintenance.

Construction Highlights

• 1/4″ and 5/16″ steel construction
• Powder-coated finish
• 16 cast iron rocker grates
• Replaceable firebrick system
• Commercial-duty components
• Fully insulated outdoor shelter

Royall 6490 Specifications

Heating Performance

• Heating Capacity: Up to 490,000 BTU
• Recommended Application: Commercial and large-scale heating
• Boiler Type: Outdoor Sheltered Wood Boiler
• Water Capacity: 196 gallons
• Firebox Capacity: 50 cubic feet

Boiler Dimensions

• Boiler Dimensions: 74″ H x 50″ W x 65″ D
• Shelter Dimensions: 90″ H x 62″ W x 81″ D
• Approximate Installed Weight: 3,900 lbs

Firebox & Loading

• Maximum Log Length: 56 inches
• Fuel Door Opening: 29″ x 25″
• Ash Removal Door: 6″ x 20″
• Removable ash handling system
• Full firebrick lining

Plumbing & Venting

• Flue Size: 8 inches
• Supply & Return Connections: 2.5″ FNPT
• UL391 Rated

Flexible Hydronic Heating Integration

The Royall 6490 is designed to integrate with a wide range of hydronic heating systems, including:

• Radiant floor heating
• Hydronic baseboard systems
• Water-to-air heat exchangers
• Unit heaters
• Domestic hot water systems
• Commercial heating loops
• Multi-zone heating networks

The system can be connected to existing propane, natural gas, fuel oil, or electric heating equipment for supplemental or backup heating flexibility.

Why Choose the Royall 6490?

For property owners and facility managers requiring serious heating capacity, the Royall 6490 Outdoor Wood Boiler delivers exceptional performance. Its massive firebox, dual draft induction system, large water capacity, and rugged commercial-grade construction make it one of the most capable wood-fired hydronic heating systems available.

When dependable heat, reduced fuel costs, and long-term durability are priorities, the Royall 6490 provides the power and reliability needed to keep large facilities warm through even the harshest winter conditions.