The Heater,water,liquid Fuel, cataloged under National Stock Number 4520-00-253-0591, 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 Aesys Technologies, L.l.c. Dba Jackson & Church Hvac Global Div York Shipley Global. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4520-00-253-0591 |
| Primary Part Number | 116495 |
| Item Name | Heater,water,liquid Fuel |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Aesys Technologies, L.l.c. Dba Jackson & Church Hvac Global Div York Shipley Global |
| 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 |
|---|---|
| 116495 PRIMARY | Aesys Technologies, L.l.c. Dba Jackson & Church Hvac Global Div York Shipley Global (USA) |
| Reference | Meaning |
|---|---|
| 6-1-1900-19A | 5/9 Secondary reference Eidal International Corporation |
| 6-1-1900-19 | 5/2 Secondary reference U.S. Government activity |
| 6-2-1907 | 5/2 Secondary reference U.S. Government activity |
NSN 4520-00-253-0591 is a Heater,water,liquid Fuel, manufactured by Aesys Technologies, L.l.c. Dba Jackson & Church Hvac Global Div York Shipley Global, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-00-253-0591 has 1 manufacturer part number on file: 116495 (Aesys Technologies, L.l.c. Dba Jackson & Church Hvac Global Div York Shipley Global).
3 possible matches (shared part number, not a government interchangeability claim): 4935-00-766-6064, 5935-01-094-1418, 4730-01-277-1575. Verify interchangeability with system specifications before substitution.
Key specifications for 116495: End Item Identification: 3510007825294. 0 specifications are documented in the U.S. Government catalog.
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.