The Heater,water,steam-Hot Water Hea, cataloged under National Stock Number 4520-01-259-5909, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-259-5909 |
| 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 | 3IN.-8 NPT IN |
| Water Outlet Connection Quantity | 1 |
| Mounting Position | HORIZONTAL |
| Water Inlet Connection Quantity | 1 |
| Outside Diameter | 14.062 INCHES NOMINAL IN |
| Water Inlet Connection Thread Size and Series/type Designator | 3IN.-8 NPT IN |
| Heating Coil Outlet Connection Thread Size and Series/type Designator | 1IN.-11-1/2 NPT IN |
| Furnished Items | RELIEF VALVE,DAIL TEMPERATURE GAGE,PRESSURE GAGE,CHECK VALVE,DRAIN VALVE,PNEUMATIC THERMOSTATIC CONTROL VALVE |
| Material | STEEL CORROSION RESISTING AND COPPER AND COPPER ALLOY |
| Heating Coil Inlet Connection Thread Size and Series/type Designator | 2IN.-11-1/2 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 |
|---|---|
| SW1B-07/2.00S | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| SW1B+07/2.00S | 3/2 Design control — primary reference U.S. Government activity |
NSN 4520-01-259-5909 is a Heater,water,steam-Hot Water Hea, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
Key specifications for 4520-01-259-5909: Water Outlet Connection Thread Size and Series/type Designator: 3IN.-8 NPT IN; Water Outlet Connection Quantity: 1; Mounting Position: HORIZONTAL; Water Inlet Connection Quantity: 1. 10 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.