Products Unit Heaters LDAP


LDAP 1200 with nozzles
LDAP 1200 with nozzles
LDAP with 1st nozzle sideways
LDAP with mid nozzle reversed
Nozzle 3 qtr view
LDAP installation


Reznor's LDAP Series Packaged Downflow Heaters are perfect for large high bay warehouses and factories. The downflow configuration with the Destratification mode allows the unit to send hot air around the roof to the floor.

The LDAP units have four suspension points for hanging or wall mounted capability. All Model LDAP heaters are certified for 83% thermal efficiency for use with either natural or propane gas and are available in three sizes - 400 MBH, 800 MBH, and 1200 MBH.

Each heat section features the Reznor® TCORE2® heat exchanger and single burner combustion system. Operation is controlled through an integrated circuit board using LED diagnostic indicator lights to identify abnormalities in control functions.  Designed for ease of installation with an external 24-volt terminal strip and gas line connection.

Model LDAP heaters are tested to ANSI and CSA standards by the ETL Testing Agency for commercial and industrial applications.


Heating Range ( MBH )

Airflow Range ( CFM )

Throw Range ( Feet )

Heating Efficiency ( Gross )

Standard Features

  • 83% Thermal efficient
  • 55°F Temperature rise range
  • TCORE2® titanium stabilized aluminized steel heat exchanger(s)
  • 208/1/60 Supply voltage
  • Open fan motor(s) with internal overload protection
  • Transformer for 24-volt conrols
  • Integrated circuit board(s) with diagnostic indictor lights
  • Multi-try direct ignition with 100% lockout
  • Single-stage natural gas valve (field adjustable for opertion to 10,000 ft / 3045M elevation)
  • Destratification adjustable fan control
  • High temperature limit controls
  • Vibration/noise isolated fan and venter motors
  • 4-pt Suspension
  • Built-in disconnect swtich
  • Exernal terminal strip for 24-volt wiring
  • External gas connection
  • Full fan guard(s)


  • Single-stage, propane gas valve (field adjustable to 10,000ft / 3045M elevation)
  • Two-stage natural or propane gas velve - Size 400 only
  • 409 Stainless steel heat exchanger(s)
  • 208 or 230 Single phase supply voltage


  • Manual Shutoff Valve
  • Multiple Heater Control
  • High Altitude Adjustment Kit
  • 4-Way Louvers
  • Discharge Nozzles
  • Vent Cap
  • Hanger Kits
  • Thermostats

5 Files


Unit Heater Marketing Catalog
Unit Heater Marketing Catalog
Download File
1.3 MB
Energy Edge: The advantages of using Model LDAP
Energy Edge: The advantages of using Model LDAP to recirculate air to prevent stratification resulting in heat loss through the roof of a building
Download File
410.9 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
2 Files

Technical Data

Catalog - Unit Heater
Unit heater catalog
Download File
4.5 MB
Submittal - Options - Unit Heater
Options available for gas fired unit heaters
Download File
1.0 MB

13 Files


Unit Installation Manual - LDAP
Installation manual for Model LDAP
Download File
2.4 MB
Parts Manuals - LDAP
Parts manual for Model LDAP
Download File
1.5 MB
Conversion Info - High Altitude Kit Installation - Model LDAP
Instructions for installing a high altitude kit for Model LDAP
Download File
228.4 kB
Option - Installation - Discharge Air Nozzles Installation - Model LDAP
Instructions for installing discharge air nozzles for Model LDAP
Download File
941.7 kB
Option - Installation - Multiple Heater Control Installation
Installation instructions for multiple heater control system
Download File
479.1 kB
Option - Installation - Louver Installation - Model LDAP
Instructions for installting 4-way louvers on Model LDAP
Download File
1.5 MB
Option - Installation - Hanger Kit Installation - Unit Heaters
Instructions for installing an optional hanger kit
Download File
354.1 kB
Option - Installation - Thermostat Option
Instructions for installing thermostat for Models UDAP, UDAS, UDBP,  UDBS, & LDAP
Download File
168.5 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
Parts Manuals - Replacement Ignition System and Gas Valves
Replacement ignition system and gas valves by serial number code and Maxitrol system components by serial number suffix
Download File
1.3 MB
Field Service - Heat Exchanger Gasket - LDAP
Gasket kit for replacement heat exchanger for Model LDAP
Download File
423.6 kB
Conversion Info - Gas Conversion - LDAP
Gas conversion kit and instructions for Model LDAP
Download File
191.5 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