Unit Heaters: Steam/Hot Water Unit Heaters
Steam/Hot Water Unit Heater Manufacturers
Modine
Featured Unit Heaters: Steam/Hot Water Unit Heaters
Modine - H2O Low-Profile Hot Water Unit Heater
Modine’s Hot Dawg™ H2O is North America’s only low-profile, residentially certified hot-water unit heater, designed for garages, workshops, and light commercial spaces. With flexible mounting (horizontal/vertical) and compatibility with boilers, heat pumps, or water heaters, it delivers efficient heating via a heavy-gauge steel construction and enclosed moving parts. Available in 3 models (HHD30, HHD45 High/Low Speed) with inputs up to 66,300 BTU/hr :cite[1]:cite[2]:cite[4].
Features
Low-Profile & Versatile Mounting
Reversible piping/electrical connections allow parallel, perpendicular, or recessed joist installations for horizontal/vertical airflow :cite[1]:cite[5].
Durable Construction
Heavy-gauge steel cabinet, 2-row copper tube/aluminum fin coil, and stainless steel components withstand 200°F @ 150 PSI :cite[1]:cite[4]:cite[5].
Quiet Operation
Twin centrifugal blowers with vibration isolators and neoprene insulation minimize noise :cite[1]:cite[5].
Smart Controls
Solid-state motor speed control and optional thermostat compatibility for precise temperature management :cite[1]:cite[5].
Safety & Convenience
Factory-installed finger guards, tool-free access panels, and ETL certification ensure user safety :cite[1]:cite[4].
Specifications
Model Options
– HHD30: 11,900–30,000 BTU/hr
– HHD45 High Speed: 45,000 BTU/hr (710 CFM)
– HHD45 Low Speed: 425 CFM :cite[2]:cite[4].
Physical Dimensions
34″ (W) × 12″ (D) × 11.96″ (H); weight: 73–80 lbs :cite[2]:cite[4]:cite[5].
Electrical & Piping
115V/1-Phase, 4.6A; 1/2″ threaded hot water connections :cite[2]:cite[4].
Certifications
ETL Certified, UL compliant, and designed/assembled in the USA :cite[1]:cite[5].
Warranty
Limited warranty coverage (exact terms vary by model) :cite[1].
Warranty
Documents
Modine - Power Throw Hydronic (PT)
Modine's Power Throw Hydronic (PT) unit heaters deliver powerful, high-velocity heat (1,860-2,520 CFM) for industrial spaces with frequently opened doors or large areas requiring long heat throw. Their unique design allows 360° rotation without piping changes and features a serpentine copper tube coil resistant to thermal shock :cite[1]:cite[6].
Features
High-Velocity Airflow
Delivers 1,860-2,520 CFM for exceptional heat throw over wide areas :cite[6].
Flexible Installation
360° rotatable design maintains piping alignment in any orientation :cite[1].
Durable Coil Design
Serpentine copper tubes withstand high steam pressures (up to 250 PSI in PTN models) without headers to prevent leaks :cite[1]:cite[6].
Specifications
Models
HSB (top/bottom connections) and HC (side connections) variants :cite[1].
Enhanced Option
PTN models feature cupro-nickel coils for corrosive/high-pressure applications :cite[6].
Mounting
Threaded rod suspension (except HSB 18/24 models supported by piping) :cite[1].
Warranty
Documents
Modine - Vertical Hydronic (V)
Modine's V-Series vertical hydronic unit heaters provide efficient space heating for commercial and industrial applications, featuring a compact vertical discharge design that saves floor space while delivering powerful heat output through copper tube/aluminum fin coils.
Features
Space-Saving Design
Vertical airflow pattern requires minimal clearance (12″ from walls).
Durable Construction
Heavy-gauge steel cabinet with epoxy powder-coated finish.
Flexible Installation
Bottom or rear piping connections simplify plumbing integration.
Specifications
Heating Capacity
10,000-150,000 BTU/hr models available.
Water Temperature
Operates with 160-240°F water (300°F max in VH models).
Airflow
Centrifugal blowers move 200-2,000 CFM.
Warranty
Documents
Modine - Horizontal Hydronic (HSB/HC)
Industrial-grade hydronic heaters featuring a serpentine copper tube design for thermal shock resistance, available in horizontal discharge (HSB) or vertical discharge (HC) configurations.
Features
Durable Construction
14-gauge steel cabinet with epoxy powder coat finish.
Flexible Installation
360° rotatable design maintains piping alignment in any orientation.
High-Temp Models
HSB-HT versions handle 250 PSI steam or 300°F water.
Specifications
Airflow
500-4,500 CFM with centrifugal blowers.
Certifications
ASME Section IV and CRN registered.
Warranty
5-year heat exchanger, 1-year parts.
Warranty
Documents
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