Unit Heater, Air Circulating, Stea4520-01-721-0722
NSN 4520-01-721-0722 · NIIN 017210722 · Part number HB024
Otis Elevator Co Sub of United Technologies Corp · FSC 4520 — Space and Water Heating Equipment · FSG 45 — Plumbing, Heating, and Waste Disposal · CAGE 45206
Government record, cited
NSN 4520-01-721-0722 — this item is cataloged by the U.S. Government under National Stock Number 4520-01-721-0722. Manufacturer of record part number: HB024.
Also searched as4520-01-721-0722 ·
4520017210722 ·
NIIN 017210722 ·
01-721-0722 ·
FSC 4520 Space and Water Heating Equipment · CAGE 45206 · HB024
Manufacturer of record: Otis Elevator Co Sub of United Technologies Corp
Identification
NSN: 4520-01-721-0722
NIIN: 017210722
FSC: 4520 — Space and Water Heating Equipment
FSG: 45 — Plumbing, Heating, and Waste Disposal
Primary part number: HB024
Manufacturer: Otis Elevator Co Sub of United Technologies Corp
General Description
The Unit Heater,air Circulating,stea, cataloged under National Stock Number 4520-01-721-0722, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Otis Elevator Co Sub of United Technologies Corp. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Otis Elevator Co Sub of United Technologies Corp (USA)
No interchangeability data on file.
Other items in FSC 4520 — Space and Water Heating Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4520-00-000-0098
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-000-0099
4520-00-000-0099 · Item name not on file
4520-00-001-1240
4520-00-001-1240 · Item name not on file
4520-00-001-3518
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-3519
HEATING ELEMENT,ELECTRICAL,IMMER
4520-00-001-6052
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-6298
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-7726
HEATER,DUCT TYPE,PORTABLE
Frequently Asked Questions
What is NSN 4520-01-721-0722?
NSN 4520-01-721-0722 is a Unit Heater,air Circulating,stea, manufactured by Otis Elevator Co Sub of United Technologies Corp, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
What part numbers are listed for NSN 4520-01-721-0722?
NSN 4520-01-721-0722 has 1 manufacturer part number on file: HB024 (Otis Elevator Co Sub of United Technologies Corp).
What are the specifications of HB024?
Key specifications for HB024: Heat Delivery Rate: 24000.0 BRITISH THERMAL UNIT; Special Features: STEAM OR WATER APPLICATIONS; WALL OR CEILING MOUNTABLE; Part Name Assigned by Controlling Agency: HORIZONTAL HYDRONIC UNIT HEATER. 1 specification is documented in the U.S. Government catalog.
Is NSN 4520-01-721-0722 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.