Mestek hsa13611 Hydronic Steam Unit Heater 35900 Btu/h

Product Description

The MESTEK hsa13611 is a horizontal hydronic and steam unit heater designed for forced-air space heating using hot water or steam as the heat source. It delivers 35,900 BTU/h at 200 degrees F inlet temperature through a copper coil heat exchanger, making it well-suited for industrial, commercial, and large utility spaces where reliable radiant-style heating is required. A 120-volt, 25-watt totally enclosed motor drives the fan at 850 CFM airflow and includes a built-in thermal overload protector. The unit connects via 1-1/4 inch FPT inlet and outlet ports and is rated to 150 psi maximum working pressure.

This unit heater is intended for horizontal ceiling or overhead mounting in spaces such as warehouses, garages, loading docks, mechanical rooms, and light manufacturing facilities. It operates on a hot water or steam hydronic loop supplied by a boiler system. The copper coil construction handles the heat exchange between the circulating fluid and the discharge airstream. Installation is performed by licensed plumbers or HVAC mechanics working on hydronic heating systems.

Key Features

• 35,900 BTU/h output at 200 degrees F water temperature
• Copper coil heat exchanger for efficient fluid-to-air heat transfer
• 850 CFM airflow with fan guard included
• 120-volt, 25-watt totally enclosed motor with thermal overload protection
• 1-1/4 inch FPT inlet and outlet connections for standard hydronic piping
• 150 psi maximum working pressure rating

Compatibility

Designed as an OEM-style replacement or direct-install unit heater for horizontal hydronic and steam heating systems using standard 1-1/4 inch FPT pipe connections.

Installation Notes

Installation should be performed by a licensed HVAC mechanic or plumber familiar with hydronic heating systems. Shut off and depressurize the boiler loop and allow the system to cool before making pipe connections. Follow local mechanical codes and IFGC or IPC requirements for hydronic system connections, pressure testing, and mounting hardware. Do not exceed the 150 psi maximum working pressure rating under any operating or test condition.

Technical Specifications

• Heat Output: 35,900 BTU/h at 200 degrees F
• Airflow: 850 CFM
• Voltage: 120 volts
• Motor Power: 25 watts
• Motor Type: Totally enclosed with thermal overload protection
• Horsepower: 1/4 HP
• Connection Size: 1-1/4 inches FPT inlet and outlet
• Maximum Working Pressure: 150 psi
• Coil Material: Copper
• Weight: 31 pounds
• Power Source: Electric
• Orientation: Horizontal

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: hsa13611