The Heater,water,electric, cataloged under National Stock Number 4520-00-952-4837, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4520-00-952-4837 |
| Item Name | Heater,water,electric |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| Thermostatic Switch | INCLUDED |
| Water Outlet Connection Thread Size and Series/type Designator | 0.750-14 NPT |
| Water Outlet Connection Quantity | 1 |
| Phase | THREE |
| Voltage in Volts and Current Type | 115.0 DC |
| Overall Diameter | 20.000 INCHES NOMINAL IN |
| Capacity | 25.0 GALLONS TANK |
| Heating Capacity Per Hour | 25.0 GALLONS |
| Water Inlet Connection Quantity | 1 |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS |
| Water Inlet Connection Thread Size and Series/type Designator | 0.750-14 NPT |
| Insulated Feature | INCLUDED |
| Attachment Device | NOT INCLUDED |
| Heating Element Type | SINGLE |
| Temp Rise Per Hour | 75.0 FAHRENHEIT DEGF |
| Switch Type | SINGLE THROW |
| Surface Treatment | PASSIVATE INSIDE |
| Surface Treatment | PASSIVATE OUTSIDE |
| Material | STEEL CORROSION RESISTING |
| Furnished Items and Quantity | 1 VALVE RELIEF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| NX540-2/115VDC | 5/9 Secondary reference Pottstown Water Heater Co Inc |
| MILH965 | 4/1 Identification reference U.S. Government activity |
| NX540-2 | 5/9 Secondary reference Pottstown Water Heater Co Inc |
NSN 4520-00-952-4837 is a Heater,water,electric, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4520-01-038-9238, 4520-01-155-0374. Verify interchangeability with system specifications before substitution.
Key specifications for 4520-00-952-4837: Thermostatic Switch: INCLUDED; Overall Height: 48.500 INCHES NOMINAL IN; Water Outlet Connection Thread Size and Series/type Designator: 0.750-14 NPT; Water Outlet Connection Quantity: 1. 20 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.