• PRODUCT OVERVIEW
  • PRODUCT SPECIFICATIONS
  • CUSTOMER REVIEWS

Reznor UDAS Separated Combustion Gas Unit Heater 83% Efficiency

Models UDAS use outdoor air/oxygen for combustion inside the heater. Keeping the flame separate from air in the garage is very important if you plan on auto repair or restoration, woodworking, stripping paint, refinishing furniture, or storing certain chemicals in the garage.

Reznor V3 series model UDAS gas-fired separated combustion unit heaters are available in 14 sizes ranging from 30,000 to 400,000 BTUH gas input. Sizes 30-125 are approved for residential application. All sizes are approved for commercial/industrial installations. Model UDAS heaters are designed for 82-83% thermal efficiency and are approved for installation in the United States and Canada by the Canadian Standards Association (CSA).

Reznor UDAS-400 V3 series unit heaters have a refreshing new appearance with a glossy white cabinet finish, the unique Reznor mitered corner, and less visible hardware. Each size cabinet is easily suspended from either 2 or 4 suspension points, or an optional hanger kit for all sizes allows for ceiling mounting. The low voltage terminal strip on the outside of the cabinet makes connecting control wiring easy with no panels to remove. The addition of a "G" terminal to the strip, along with the new design of the circuit board, allows for fan only operation (without adding relays). All units have a factory installed gas line nipple to the exterior of the cabinet for easy gas service connection.

The preeminent new internal feature is the T-CORE2® heat exchanger and single burner combustion system. Other standard features include a single-stage gas valve, multi-try direct spark ignition with 100% lockout, pressure switch to verify vent flow, resiliently isolated venter motor, venter wheel with improved housing, resiliently isolated axial fan and motor assembly and a high temperature limit control. Sizes 30-125 also include a flame rollout safety switch. Operation is controlled through an integrated circuit board. The circuit board monitors heater operation and has LED diagnostic indicator lights to identify abnormalities in control functions.

The first ever separated combustion system in the commercial/industrial heating industry was introduced on a Reznor heater in the 1960�s, and that proven technology is continued in this new separated combustion product. Reznor UDAS-400 separated combustion unit heaters require installation of a specially designed combustion air/vent system including the unique concentric adapter box that allows for only one building penetration for both the vent and combustion air.

The new V3 Series unit heaters are designed to provide all the features you expect in a Reznor heater plus improved efficiency, easier installation and a new look - both inside and out. Look for the unique white unit with no visible front and bottom hardware, deep red louvers, black side handle, and angled corner to know you have a genuine Reznor unit by Thomas & Betts.

Note: Selection of either a horizontal or vertical combustion air/vent kit is required.

Reznor UDAS Standard Features

  • Certified for residential heating application
  • Certified for commercial/industrial heating application
  • 82-83% thermal efficient - TOP in its class!
  • 50-60�F rise range
  • NEW T-CORE2® design titanium stabilized aluminized steel heat exchanger (patent pending)
  • NEW T-CORE2® single burner combustion system including a one-piece burner assembly (patent pending)
  • 115/1/60 supply voltage
  • 115 volt open fan motor with internal overload protection
  • Transformer for 24-volt controls
  • Integrated circuit board with diagnostic indicator lights
  • Multi-try direct ignition with 100% lockout
  • Fan relay (included on the circuit board)
  • Natural or propane single-stage gas valve (field adjustable for operation to 9,000 ft elevation)
  • Vibration/noise isolated fan and venter motors ~designed for low noise operation
  • 2-pt and 4-pt suspension - standard on all sizes
  • External terminal strip for 24-volt wiring
  • External gas connection
  • Full fan guard - engineered for safety
  • Improved cabinet design with less visible hardware and a NEW Reznor appearance
  • Look for the white cabinet and unique mitered corner!

Additional Information

SKU/MODEL UDAS
Brand Reznor
Application No
Energy Star Rated No
Heating Range No
Warranty No