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HSB/HC Series

Horizontal Hydronic Unit Heater

The Modine Horizontal Hydronic Unit Heater is engineered to deliver exceptional horizontal air-throw, using hot-water or steam systems for optimal efficiency. Combining impressive long-throw performance with flexible installation options and robust durability, the HSB/HC series stands out in demanding commercial and industrial environments. With top/bottom (HSB) or side piping configurations (HC) and a serpentine copper-tube coil engineered for superior thermal shock resistance, you can count on the HSB/HC series for reliable, consistent heating performance when you need it most.

Models

  • HSB – Top & Bottom Connections
  • HC – Side Connections
  • 13 Model Sizes: 18, 24, 33, 47, 63, 86, 108, 121, 165, 193, 258, 290, and 340 MBH
Where To Buy

Highlighted Features

Quiet, Clean Hydronic Operation

Using hot water or steam from an existing hydronic system, the unit delivers silent, draft-reduced heat without burners or emissions—perfect for comfort-sensitive or enclosed environments.

Efficient Horizontal Heat Delivery

The HSB/HC’s horizontal discharge design pushes warm air across the space for even heating throughout workshops, warehouses, mechanical rooms, and garages—ideal for applications needing broad, directional heat.

Durable, Versatile Construction

With a rugged steel cabinet and corrosion-resistant core components, the HSB/HC is engineered for long service life. Multiple mounting options and accessible piping connections make installation straightforward in virtually any horizontal application.

Product Details & Specifications

Key Features
  • Horizontal airflow orientation for effective long-reach heat delivery
  • Flexible piping configurations: top/bottom (HSB) or side-inlet/outlet (HC)
  • 360° rotation capability without the need for piping changes, simplifying installation
  • Serpentine copper-tube coil design provides high thermal-shock resistance
  • Two-piece casing for easy access to the coil
  • Lightweight construction with user-friendly mounting and suspension options
  • Elimination of coil headers reduces the risk of leaks and increases coil face area without enlarging the unit
  • Coil designed for higher water carrying capacity with reduced friction loss
  • Proudly Designed, Engineered, and Assembled in the USA
Options

Available Models:

  • HSB: Top and Bottom Inlet and Outlet Connections
  • HC: Side Inlet and Outlet Connections

Model Sizes:

  • 13 Model Sizes: 18, 24, 33, 47, 63, 86, 108, 121, 165, 193, 258, 290, and 340 MBH

*Based on 2 lb. steam, 60°F entering air

Supply Voltage:

  • 115V/1PH/60Hz
  • 208V/1Ph/60Hz
  • 230V/1Ph/60Hz
  • 208V/3Ph/60Hz
  • 230V/3Ph/60Hz
  • 460V/3Ph/60Hz
  • 575V/3Ph/60Hz

Motor Type:

  • Enclosed Air Over with Thermal Overload
  • Explosion Proof with Thermal Overload

Fan Gaurd:

  • Standard Fan Guard

  • Fingerproof Fan Gaurd

Accessories

Factory-Installed

  • Fingerproof Fan Guard

Field Installed

  • Standard Thermostate(s)
  • Explosion-proof Thermostat
  • Thermostat Guard
  • Discharge Hoods
  • Manual Starter
  • Step-Down Transformer
Warranty
Applications

The HSB/HC series is designed for long heat throw and uniform heat delivery. Ideal for heating buildings with large open areas and low ceilings, and for counteracting heat loss through exterior walls, especially where windows are present.

Common applications include:

  • Warehouses, distribution centers, and service bays
  • Facility workrooms, equipment rooms, and corridors
  • Light-industrial buildings with existing boiler/hydronic systems

Tech Documents

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