The Heater,water,electric, cataloged under National Stock Number 4520-01-659-5174, 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 Johnson Controls Navy Systems, Llc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Heater,water,electric |
| FSC / FSG | 4520 — Space and Water Heating Equipment (FSG 45) |
| Manufacturers | Johnson Controls Navy Systems, Llc (CAGE 66935) |
| Parameter | Value |
|---|---|
| NSN | 4520-01-659-5174 |
| Primary Part Number | 377-31304-000 |
| Item Name | Heater,water,electric |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Johnson Controls Navy Systems, Llc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 377-31304-000 PRIMARY | Johnson Controls Navy Systems, Llc (USA) |
| Reference | Meaning |
|---|---|
| 477-24754-000 | D/9 Drawing number reference only Johnson Controls Navy Systems, Llc |
| 477-24754-000 ITEM 92 | C/1 Advisory reference — outside the item-of-supply concept Johnson Controls Navy Systems, Llc |
NSN 4520-01-659-5174 is a Heater,water,electric, manufactured by Johnson Controls Navy Systems, Llc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-659-5174 has 1 manufacturer part number on file: 377-31304-000 (Johnson Controls Navy Systems, Llc).
3 possible matches (shared part number, not a government interchangeability claim): 4520-01-659-5185, 4140-01-659-5778, 4820-01-707-4449. Verify interchangeability with system specifications before substitution.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.