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

3 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
87.4 kB
General Product Brochure
Overview brochure covering the Reznor product line.
Download File
1.6 MB

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 - 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
401.1 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
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