Products Unit Heaters OH


oh 1450
oh 1450
ot 1550


Reznor's OH oil-fired unit heaters are available in inputs of 118,000, 173,000, and 229,000 BTUH with 82% efficiency output.  These completely packaged unit heaters burn No. 2 fuel oil.

OH heaters are equipped with a propeller fan that is enclosed in an OSHA-type full safety fan guard. Model OH oil-fired unit heaters are approved for installation in the United States and Canada by the Canadian Standards Association (CSA).

  1. Not certified for residential use.
  2. A UL listed (or equivalent) oil supply tank must be used with Reznor oil-fired heaters.  Model OT-250 fuel tank is available from Reznor.
    • UL listed
    • 250-gallon capacity
    • WorkBench top

Heating Range ( MBH )

Airflow Range ( CFM )

Heating Efficiency ( Gross )

Standard Features

  • Full automatic, thermostatically controlled operation
  • Low stress, 18-gauge steel heat exchanger
  • Heavy, 13-gauge steel combustion chamber
  • 115/1/60 supply voltage
  • 24-volt control voltage transformer
  • Atomizing power burner with single-stage fuel pump
  • Electric spark ignition with cad-cell flame safety system
  • Fan and limit safety controls
  • Toggle disconnect switch
  • Propeller fan
  • Full safety fan guard
  • Totally enclosed, permanently lubricated PSC motor with internal overload protection
  • Built-in burner service tray
  • Large easily accessible service panels for combustion chamber and heat exchanger maintenance
  • Observation and flue gas sampling ports
  • Individually adjustable horizontal louvers
  • 4-point suspension (1/2" threaded connectors)
  • Draft regulator - CSA models

Optional Features - Field Installed

  • Vertical louvers
  • Atomizing burner with two-stage fuel pump
  • 30 GPH booster pump assembly with motor and two stage fuel pump
  • 70 GPH booster pump assembly with motor and two stage fuel pump
  • Booster pump pressure switch - used for intermittent pump operation in pressurized system
  • Oil safety valve - recommended for all systems - prevents siphoning and over pressure
  • Draft regulator - UL listed model
  • Draft inducer relay
  • Hanger kit to suspend from 1" pipe
  • Outside combustion air adapter (not available with CSA models)
  • Thermostat, single stage, 24-volt (40-90F)
  • Thermostat guard with locking cover
  • Draft regulator - required for CSA units

5 Files


Unit Heater Marketing Catalog
Unit Heater Marketing Catalog
Download File
1.3 MB
Comp Edge: With over 70 years of production, Reznor Unit Heaters are the proven leader in the industry
Comp Edge: With over 70 years of production, Reznor Unit Heaters are the proven leader in the industry
Download File
278.0 kB
Cooling & Ventilation Product Line
Cooling & Ventilation Product Line Card
Download File
392.3 kB
Heating & Ventilation Product Line
Heating & Ventilation Product Line Card
Download File
736.3 kB
VRF Product Line
VRF Product Line Card
Download File
489.1 kB

Technical Data
3 Files

Technical Data

Catalog - Unit Heater
Unit heater catalog
Download File
4.5 MB
Tech Spec - Oil Tank & Stand
Descripiton, features and options for the oil tank stand Model OT (used with Model OH).
Download File
194.1 kB
Submittal - Options - Unit Heater
Options available for gas fired unit heaters
Download File
1.0 MB

8 Files


Unit Installation Manual - OH
Installation manual for Model OH
Download File
1.2 MB
Parts Manual - OH - Parts Manual
Parts manual for oil heater Model OH
Download File
679.8 kB
Option - Installation - Draft Booster Relay Installation - OH
Instructions for installing draft booster relay on Model OH
Download File
220.6 kB
Option - Installation - Vertical Louvers Installation - OH
Instructions for installing vertical louvers on Model OH
Download File
250.6 kB
Option - Installation - Heater Stand Assembly - Model OT
Instructions for assembly of heater stand for optional oil tank (Model OT) for Model OH
Download File
556.9 kB
Option - Installation - Hanger Kit Installation - Unit Heaters
Instructions for installing an optional hanger kit
Download File
354.1 kB
Parts Manuals - Functional Replacement Fan/Blower Controls and Limit Controls
 Parts manual for functional replacement fan/blower controls and limit controls
Download File
322.8 kB
Field Service - Replacement of Discontinued Relays
Installation for kits designed to replace relays no longer available from suppliers. Applies to all Reznor units using obsolete relays.
Download File
340.4 kB

Other Files
1 File

Other Files

Warranty Statement
Reznor equipment limited warranty statement
Download File
183.4 kB