The Heater,water,steam-Hot Water Hea, cataloged under National Stock Number 4520-00-273-1291, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-00-273-1291 |
| Item Name | Heater,water,steam-Hot Water Hea |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Status | ACTIVE |
| Water Outlet Connection Thread Size and Series/type Designator | 2 IN.-11-1/2 NPT IN |
| Water Outlet Connection Quantity | 1 |
| Capacity | 750.0 GALLONS TANK |
| Mounting Position | VERTICAL |
| Heating Capacity Per Hour | 20.000 GALLONS |
| Water Inlet Connection Quantity | 1 |
| Outside Diameter | 48.000 INCHES NOMINAL IN |
| Water Inlet Connection Thread Size and Series/type Designator | 4 IN.-8 NPT IN |
| Heating Coil Outlet Connection Thread Size and Series/type Designator | 2 IN.-11-1/2 NPT IN |
| Nondefinitive Spec/std Data | 1 CLASS |
| Surface Treatment | PAINT |
| Heating Coil Surface Area | 38.000 SQUARE FEET |
| Furnished Items | BREAKER,VACUUM,STRAINER,3/4 IN.,STRAINER,2 IN.,THERMOMETER,ANGLE TYPE,RANGE 40 DEG F TO 240 DEG F,TRAP,BUCKET,INVERTED,3/4 IN.,VALVE,CHECK,VALVE,DRAIN,2 IN.,VALVE,RELIEF,TEMP AND PRESS,VALVE,TEMP REGULATING IN |
| Material | STEEL CORROSION RESISTING |
| Heating Coil Inlet Connection Thread Size and Series/type Designator | 4 IN.-8 NPT IN |
| 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 |
|---|---|
| MIL-H-12322 | 4/1 Identification reference U.S. Government activity |
NSN 4520-00-273-1291 is a Heater,water,steam-Hot Water Hea, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
Key specifications for 4520-00-273-1291: Water Outlet Connection Thread Size and Series/type Designator: 2 IN.-11-1/2 NPT IN; Water Outlet Connection Quantity: 1; Capacity: 750.0 GALLONS TANK; Mounting Position: VERTICAL. 15 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.