PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

51EHeater,water,liquid Fuel

Bock Water Heaters, Inc. · NSN 4520-01-242-2963 · FSC 4520 · No Item Name Available
Verified by PartsTable
NSN 4520-01-242-2963 — this item is cataloged by the U.S. Government under National Stock Number 4520-01-242-2963. Primary manufacturer part number: 51E.
Features
  • Heater,water,liquid Fuel — FSC 4520
  • General Characteristics Item Description: OIL FIRED; GLASS LINED; 50 GAL. STORAGE; BURNER CONTROL PACKAGE INCLUDED
  • 1 verified cross-reference
  • Primary manufacturer: Bock Water Heaters, Inc.
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Heater,water,liquid Fuel, cataloged under National Stock Number 4520-01-242-2963, is classified within Federal Supply Class 4520 (No Item Name Available) of the Plumbing, Heating, and Waste Disposal group. The primary manufacturer of record is Bock Water Heaters, Inc.. Government technical data includes 1 verified specification, sourced from the Federal Logistics Information System (FLIS). This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN4520-01-242-2963
Primary Part Number51E
Item NameHeater,water,liquid Fuel
FSC / FSG4520 / 45 — No Item Name Available
ManufacturerBock Water Heaters, Inc.
StatusACTIVE
General Characteristics Item DescriptionOIL FIRED; GLASS LINED; 50 GAL. STORAGE; BURNER CONTROL PACKAGE INCLUDED
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
3439-00-856-9496 INTERCHANGEABLE
Heat Sink,soldering Aid
4820-01-426-7890A348-4 INTERCHANGEABLE
Valve,angle
Crane Carrier Company, Llc
Cross-Reference Index
Part NumberManufacturer
51E PRIMARY Bock Water Heaters, Inc. (USA)
Related Parts
3439-00-856-9496INTERCHANGEABLE
HEAT SINK,SOLDERING AID
4820-01-426-7890INTERCHANGEABLE
VALVE,ANGLE
A348-4

Frequently Asked Questions

What is NSN 4520-01-242-2963?

NSN 4520-01-242-2963 is a Heater,water,liquid Fuel, manufactured by Bock Water Heaters, Inc., classified under FSC 4520 (No Item Name Available). Status: active.

What are the part numbers for NSN 4520-01-242-2963?

NSN 4520-01-242-2963 has 1 cross-referenced part number: 51E (Bock Water Heaters, Inc.).

What NSN replaces 4520-01-242-2963?

There are 2 known substitutes for 4520-01-242-2963: 3439-00-856-9496, 4820-01-426-7890. Verify interchangeability with system specifications before substitution.

What are the specifications of 51E?

Key specifications for 51E: General Characteristics Item Description: OIL FIRED; GLASS LINED; 50 GAL. STORAGE; BURNER CONTROL PACKAGE INCLUDED. 1 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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