Mestek hsb20411 Hydronic Steam Unit Heater 148K Btu

Product Description

The MESTEK hsb20411 is a horizontal hydronic and steam unit heater rated at 148,100 BTU/h output at 200 degrees F entering water or steam temperature. The unit moves 2,900 CFM through a copper tube heat exchanger and is equipped with a fan guard for safe operation in occupied spaces. Power comes from a 1/3 HP, 120-volt totally enclosed motor with a built-in thermal overload protector. Supply and return connections are 1-1/2 inch FPT, and the system is rated for a maximum working pressure of 150 psi. Licensed HVAC and plumbing contractors install this heater in commercial and industrial heating applications where hot water or steam distribution systems are already in place.

The hsb20411 is suited for commercial and industrial spaces such as warehouses, garages, loading docks, manufacturing floors, and similar large-volume areas that require reliable forced-air heat from an existing hydronic or steam boiler system. The horizontal discharge configuration directs heated air across the floor plane, making it a practical choice for wide, open-span spaces where vertical clearance is limited or where heat distribution at occupant level is required. The 1-1/2 inch FPT connections are compatible with standard threaded pipe installations.

Key Features

• 148,100 BTU/h output capacity at 200 degrees F inlet temperature
• Copper tube heat exchanger for efficient heat transfer and corrosion resistance in hydronic and steam systems
• 2,900 CFM airflow with fan guard for personnel protection
• 1/3 HP, 120-volt totally enclosed motor with thermal overload protection
• 1-1/2 inch FPT inlet and outlet connections for standard threaded pipe tie-in
• 150 psi maximum working pressure rating suitable for high-pressure steam and hot water systems

Compatibility

Designed as an OEM-style replacement or direct installation unit for horizontal hydronic and steam heating systems using 1-1/2 inch FPT piping at up to 150 psi working pressure.

Installation Notes

Installation should be performed by a licensed HVAC or plumbing contractor in accordance with local mechanical codes and ASHRAE guidelines. Shut off and fully depressurize the boiler system and allow all components to cool before making pipe connections. Ensure that supply voltage matches the 120-volt motor requirement and that the electrical circuit is properly sized and protected per NEC requirements. Support the unit independently of the piping to prevent stress on FPT connections.

Technical Specifications

• Heating Capacity: 148,100 BTU/h at 200 degrees F
• Airflow: 2,900 CFM
• Motor Horsepower: 1/3 HP
• Voltage: 120 volts
• Motor Type: Totally Enclosed with Thermal Overload Protection
• Heat Exchanger Material: Copper Tube
• Pipe Connection Size: 1-1/2 inches FPT Inlet and Outlet
• Maximum Working Pressure: 150 psi
• Unit Weight: 90 pounds
• Power Source: Electric
• Discharge Orientation: Horizontal

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: hsb20411