The Heater,convection,steam-Hot Wate, cataloged under National Stock Number 4520-00-273-1129, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Technical Specifications
Parameter
Value
NSN
4520-00-273-1129
Item Name
Heater,convection,steam-Hot Wate
FSC / FSG
4520 / 45 — Space and Water Heating Equipment
Status
ACTIVE
Heat Delivery Rate
11200.0 BRITISH THERMAL UNIT
Heat Medium Type
HOT WATER OR STEAM
Inclosure Material
STEEL
Heat Outlet Quantity
1
Heat Discharge Outlet Type
STATIONARY
Heat Delivery Direction
VERTICAL
Height
26.000 INCHES NOMINAL IN
Maximum Pressure Limit
35.0 POUNDS PER SQUARE INCH GAGE LBS
Depth
6.000 INCHES NOMINAL IN
Width
29.000 INCHES NOMINAL IN
Heat Directing Device
FIXED LOUVER
Mounting Type
WALL SUSPENDED, ROOM INTERIOR
Heating Element Type
HOT WATER COIL OR STEAM COIL
Operating Control Type
THERMOSTATIC
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
X
⇄Related Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4520-00-273-1132S3802-921624-6NMPOSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)Naval Ship Systems Command
4520-00-273-1149POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)
4520-00-273-1150S3802-921624NM4 1-2POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)Naval Sea Systems Command
4520-00-273-11516329453POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)Dunham-Bush, Inc. Dba Dunham-Bush Inc Commercial & Industrial
4520-00-273-1152POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)
4520-00-273-1153S3802-921624POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)Naval Ship Systems Command
4520-00-288-7111S3802-921624-2 1-2NMPOSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)Naval Sea Systems Command
4520-00-289-3926S3802-921624-2NMPOSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
Possible match (shared part number)Naval Sea Systems Command
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
S3802-921624-11
C/1Advisory reference — outside the item-of-supply concept
Naval Sea Systems Command
M3117 CLASS 1 SIZE 11
2/2Government specification standardization
U.S. Government activity
S3802-921624NM11
5/1Secondary reference
Naval Sea Systems Command
MIL-H-3117-CL-1-SZ-11
5/9Secondary reference
U.S. Government activity
S3802-921624
D/9Drawing number reference only
U.S. Government activity
NSTDSIZE11
5/9Secondary reference
Modine Mfg Co
MIL-H-3117
4/1Identification reference
U.S. Government activity
Related Parts
4520-00-273-1132POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
S3802-921624-6NM
4520-00-273-1149POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
4520-00-273-1150POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
S3802-921624NM4 1-2
4520-00-273-1151POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
6329453
4520-00-273-1152POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
4520-00-273-1153POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
S3802-921624
4520-00-288-7111POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
S3802-921624-2 1-2NM
4520-00-289-3926POSSIBLE MATCH
HEATER,CONVECTION,STEAM-HOT WATE
S3802-921624-2NM
Frequently Asked Questions
What is NSN 4520-00-273-1129?
NSN 4520-00-273-1129 is a Heater,convection,steam-Hot Wate, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
What NSN replaces 4520-00-273-1129?
8 possible matches (shared part number, not a government interchangeability claim): 4520-00-273-1132, 4520-00-273-1149, 4520-00-273-1150. Verify interchangeability with system specifications before substitution.
What are the specifications of 4520-00-273-1129?
Key specifications for 4520-00-273-1129: Heat Delivery Rate: 11200.0 BRITISH THERMAL UNIT; Heat Medium Type: HOT WATER OR STEAM; Inclosure Material: STEEL; Heat Outlet Quantity: 1. 14 specifications are documented in the U.S. Government catalog.
Is NSN 4520-00-273-1129 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.