The Heater,circulation, cataloged under National Stock Number 4520-01-253-3562, 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 Chromalox Inc Dba Chromalox Precision Heat and Control, Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4520-01-253-3562 |
| Primary Part Number | 010840 |
| Item Name | Heater,circulation |
| FSC / FSG | 4520 / 45 — Space and Water Heating Equipment |
| Manufacturer | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc |
| Status | ACTIVE |
| General Characteristics Item Description | STEEL; 32.938 IN. OA LG; 1 1.000 IN. PIPE INLET AND 1 1.000 IN. PIPE OUTLET 22.500 IN. APART; 2 0.375 IN. DIA MOUNTING LUGS 16.500 IN. APART; USED FOR HEATING HEAVY OIL IN |
| 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 |
|---|---|
| NWHO-30315-480V-3PH-3KW | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| 010840 PRIMARY | Chromalox Inc Dba Chromalox Precision Heat and Control, Inc (USA) |
| Reference | Meaning |
|---|---|
| TAC3M3305T5 | 5/9 Secondary reference Intelliworks Ht |
| TAC3M3305T5 | 3/9 Design control — primary reference Tamco, Inc. Dba Technical Assistance Company Div Technical Assistance Company |
| 363-0051-003 | 5/2 Secondary reference U.S. Government activity |
NSN 4520-01-253-3562 is a Heater,circulation, manufactured by Chromalox Inc Dba Chromalox Precision Heat and Control, Inc, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
NSN 4520-01-253-3562 has 2 manufacturer part numbers on file: NWHO-30315-480V-3PH-3KW (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc), 010840 (Chromalox Inc Dba Chromalox Precision Heat and Control, Inc).
Key specifications for 010840: General Characteristics Item Description: STEEL; 32.938 IN. OA LG; 1 1.000 IN. PIPE INLET AND 1 1.000 IN. PIPE OUTLET 22.500 IN. APART; 2 0.375 IN. DIA MOUNTING LUGS 16.500 IN. APART; USED FOR HEATING HEAVY OIL IN. 1 specification is 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.