Dunham-Bush C-525-G Hot Water Unit Heater 4-Tube Coil 115V 1/8 HP 1550 RPM

Dunham-Bush C-525-G Hot Water Unit Heater 4-Tube Coil 115V 1/8 HP 1550 RPM

The Dunham-Bush C-525-G is a commercial hot water unit heater designed to heat interior spaces using a forced-air fin-and-tube coil fed by a hot water supply line. Hot water circulates through the 4-tube coil while a motor-driven fan draws room air through the finned exchanger and exhausts it through a duct fitting, delivering heated air to the space. This unit is from Dunham-Bush's Commercial Products Division and carries Cat. No. C-525-G per the original rating plate.

Specifications & What's Included

• Manufacturer: Dunham-Bush Commercial Products Division
• Model / Cat. No.: C-525-G
• Heater type: Hot water fin-and-tube unit heater
• Coil: 30-inch wide, 4-tube hot water exchanger coil
• Water inlet / outlet: 1.5-inch threaded connections
• Duct outlet fitting: 16.5-inch diameter
• Motor brand / model: GE (General Electric) Model 5KSP39DG2325AS
• Motor voltage: 115V
• Motor amperage: 5.20 A
• Motor horsepower: 1/8 HP
• Motor speed: 1550 RPM
• Phase: Single phase
• Frequency: 60 Hz
• Motor insulation class: Class A
• Motor protection: Thermally protected, Continuous Air Over (CONT. AIR OVER)
• Fan: 3-blade propeller, mounted directly on motor shaft
• Drawing / revision: E230175 REV. 11
• No manual or accessories included — unit only

Applications

Hot water unit heaters like the Dunham-Bush C-525-G are standard equipment in commercial and industrial heating applications where a central boiler or hot water plant supplies the heat source. They are commonly installed in warehouses, garages, loading docks, factories, utility rooms, and light commercial spaces where forced-air delivery from a duct connection is practical. The unit connects to an existing hot water heating loop — typically at 140–180°F supply temperature — and the fan circulates air across the coil to deliver consistent warmth to the space below or around it. Dunham-Bush has been a recognized name in commercial HVAC and refrigeration equipment for decades, and the C-525-G is a compact single-phase unit well suited for smaller zones or supplemental heating within a hydronic system.