Modine HSB - 121,000 BTU - Hot Water/Steam Unit Heater - Horizontal - Copper Heat Exchanger - Top/Bottom Connections

Modine HSB - 121,000 BTU - Hot Water/Steam Unit Heater - Horizontal - Copper Heat Exchanger - Top/Bottom Connections


  • $1,249.00
    Unit price per 
  • Save $128.87
Shipping calculated at checkout.

FREE shipping for orders over $99 weighing less than 150 lb.

FREE delivery in Western New York State

FREE curbside pickup in Rochester

$200 flat-rate standard freight for items over 150 lb.

Only 0 left!
Will be in stock after


Modine's HSB121 is a high-grade hot water/steam unit heater that can be fitted into a new or already existing hydronic system with ease. The HSB121 can emit 121,000 BTU/hr. of heating power with a powerful fan behind it for air propulsion. high-grade steel is used for the casing to ensure durability and longevity. Designed for horizontal use, the unit heater is excellent for heating long corridors or blanketing walls with heat. The HSB121 has supply and return connections on the top and bottom of the unit, allowing it to be installed facing any direction.

Top and Bottom Piping Connections

The HSB121 has top and bottom connections for supply and return piping. The vertical connections allow the unit heater to be faced in any direction during installation.

Two-piece Casing

A two-piece casing is used with the HSB121, allowing for incredibly easy access to the coil in case maintenance is required.

Tapped Suspension Holes

The HSB121 comes with pre-drilled tapped holes for suspension by threaded rod. This reduces installation time for your contractor, saving you money on installation.

Thermal Shock Resistant

The serpentine copper tube coil is very resistant to thermal shock even at high steam temperatures. This prevents undesired warping of the coil itself, as well as decreasing necessary maintenance.

Smart Coil Layout

The layout of the coil does not include coil headers. This eliminates potential leaks and maintenance without increasing the overall size of the unit.

Baked-On Polyester Paint

The HSB121 features a neutral colored baked-on polyester paint, providing excellent corrosion resistance and durability while blending in with a wide variety of environments.

Modine Installation

Installation by a professional installer is required by the manufacturer.



Manufacturer Part Number HSB121S01
Applications Unit Heater, Garage Heater, Workshop Heater, Loading Dock Heater, Supplemental Heater
Warranty Parts: 2 Years
Fuel Type Steam or hot water
Heat Exchanger Material Copper
Air Flow Capacity (CFM) 1775
Orientation Horizontal
Air Throw (feet from face of unit) 25
Return Connection 1 1/4 Inches
Supply Connection 1 1/4 Inches
Voltage 115 Volts
Frequency 60 Hz
Phase 1
Certifications CSA Listed
Product Depth (in.) 16 1/4 Inches
Product Height (in.) 24 7/16 Inches
Product Width (in.) 25 1/2 Inches
Product Dimensions (in.) 24 7/16 x 25 1/2 x 16 1/4 Inches
Shipping Weight (lb.) 86 pounds
Package Quantity 1
Import Designation Made in USA
Country of Origin United States

Related Products