Mestek hsa11811 Hydronic Steam Unit Heater 18400 Btu/h

Product Description

The MESTEK hsa11811 is a horizontal hydronic and steam unit heater designed for forced-air heat distribution in commercial and industrial spaces. It delivers 18,400 BTU/h at 200 degrees F water temperature using a copper coil heat exchanger. A totally enclosed (TE) motor with thermal overload protection drives the fan at 500 CFM airflow. The motor draws 16 watts at 120 volts and is rated at 1/4 horsepower. Hot water or steam supply and return connections are 1-1/4 inch FPT. The unit is rated for a maximum working pressure of 150 psi. Licensed HVAC and mechanical contractors typically handle installation on hydronic heating systems.

This unit heater is suited for horizontal ceiling-mount applications in warehouses, garages, loading docks, manufacturing facilities, and similar commercial or industrial spaces where overhead hot water or steam heat distribution is required. The horizontal discharge pattern directs conditioned air along the floor plane for effective zone heating. The fan guard provides personnel protection around the rotating fan assembly. At 24 pounds, the unit is manageable for a two-person overhead installation.

Key Features

• 18,400 BTU/h output capacity rated at 200 degrees F entering water temperature
• Copper coil heat exchanger for efficient hydronic or steam heat transfer
• 500 CFM airflow with fan guard for personnel safety
• Totally enclosed motor with thermal overload protection for reliable operation in dusty environments
• 1-1/4 inch FPT inlet and outlet connections for straightforward piping integration
• 150 psi maximum working pressure compatible with typical commercial hydronic and steam systems

Compatibility

Designed as an OEM-style replacement or direct installation unit heater for horizontal hydronic and steam heating systems operating at up to 150 psi with 1-1/4 inch FPT piping connections.

Installation Notes

Installation should be performed by a licensed mechanical or HVAC contractor following applicable local mechanical codes and IFGC or IPC guidelines for hydronic systems. Shut off and depressurize the hydronic or steam supply before making any piping connections. Mount the unit securely to structural ceiling members rated for the combined weight of the unit and piping. Verify that supply voltage matches the 120-volt motor rating before energizing the unit.

Technical Specifications

• Heating Capacity: 18,400 BTU/h at 200 degrees F
• Airflow: 500 CFM
• Voltage: 120 volts
• Motor Power: 16 watts
• Motor Horsepower: 1/4 HP
• Motor Type: Totally Enclosed with Thermal Overload Protection
• Coil Material: Copper
• Connection Size: 1-1/4 inch FPT Inlet and Outlet
• Maximum Working Pressure: 150 psi
• Weight: 24 pounds
• Power Source: Electric

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: hsa11811