Mestek xf400a1ns1110 Commercial Unit Heater 400K Btu/h Ng

Product Description

The MESTEK xf400a1ns1110 is a commercial gas-fired unit heater rated at 400,000 BTU/h on natural gas. It operates on 115 volts and delivers 83% thermal efficiency through a single-stage direct spark ignition system with an aluminum heat exchanger. Two 1/3 HP open drip-proof (ODP) motors drive the unit's airflow. The heater is power vented and supports both standard venting and separated combustion configurations, giving installers flexibility in placement and combustion air sourcing. At 339 pounds, this unit is built for demanding commercial heating applications where reliable, high-output warmth is required.

The xf400a1ns1110 is designed for commercial and industrial interior spaces such as warehouses, manufacturing facilities, hangars, and large service bays where sustained high-output heating is necessary. The power vented design allows installation away from exterior walls when separated combustion is used, making it suitable for tightly constructed or high-infiltration buildings. Licensed commercial HVAC contractors and mechanical contractors typically size and install units of this class to meet IMC and local mechanical code requirements.

Key Features

• 400,000 BTU/h natural gas input for high-capacity commercial heating
• 83% thermal efficiency with single-stage direct spark ignition
• Aluminum heat exchanger for corrosion resistance and heat transfer performance
• Two 1/3 HP ODP motors for balanced airflow distribution
• Power vented operation compatible with standard vent or separated combustion configurations
• Heavy-duty construction at 339 pounds for permanent commercial installation

Compatibility

Designed as an OEM commercial unit heater for permanent installation in natural gas heating systems requiring high-capacity, power vented operation in commercial or industrial occupancies.

Installation Notes

Installation must be performed by a licensed commercial HVAC or mechanical contractor in accordance with the International Mechanical Code, NFPA 54, and all applicable local codes. Shut off gas supply and disconnect electrical power before servicing or making connections. The separated combustion option requires proper sizing of both the vent and combustion air intake piping per the manufacturer specifications. At 339 pounds, adequate structural support and rigging equipment are required for safe overhead or elevated mounting.

Technical Specifications

• Heating Capacity: 400,000 BTU/h
• Fuel Type: Natural Gas
• Voltage: 115 volts
• Thermal Efficiency: 83%
• Ignition Type: Direct Spark
• Staging: Single-Stage
• Heat Exchanger Material: Aluminum
• Motor Configuration: Two 1/3 HP ODP Motors
• Venting: Power Vented, Standard Vent or Separated Combustion
• Unit Weight: 339 pounds

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: xf400a1ns1110