PSC 4520: Space and Water Heating Equipment
4520 is the product and service code (PSC) federal agencies use for space and water heating equipment, in the plumbing, heating, waste disposal group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 4
- Spending, FY2026
- $38.3 million
- Share to small businesses
- 71%
Open contracts with PSC 4520, due soonest
- Clamp together Stainless Steel Duct System
Due in 3 daysOct 13, 2026
- Double Wall Duct System
Due in 3 daysOct 13, 2026
Where 4520 sits in the PSC Manual
- Category: Product
- Group 45: Plumbing, Heating, Waste Disposal
- Code 4520: Space and Water Heating Equipment
NAICS codes used with PSC 4520
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with 4520 most often:
| NAICS | Industry | Spent, last 3 years |
|---|---|---|
| 333414 | Heating Equipment (except Warm Air Furnaces) Manufacturing | $34.2 million |
| 333415 | Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing | $20.7 million |
| 336411 | Aircraft Manufacturing | $6.5 million |
| 333310 | Commercial and Service Industry Machinery Manufacturing | $6.4 million |
| 336413 | Other Aircraft Parts and Auxiliary Equipment Manufacturing | $4.5 million |
| 332323 | Ornamental and Architectural Metal Work Manufacturing | $4 million |
| 332322 | Sheet Metal Work Manufacturing | On 2 open |
Who buys under PSC 4520
Agencies with the most contract dollars under 4520 over the last three fiscal years, per USAspending.gov:
| Agency | Obligated |
|---|---|
| Defense Logistics Agency | $66.6 million |
| Department of the Air Force | $7.9 million |
| Department of the Army | $7 million |
| Department of the Navy | $4.8 million |
| Federal Prison System / Bureau of Prisons | $3.3 million |
| Department of Veterans Affairs | $2.4 million |
| U.S. Coast Guard | $1.9 million |
| National Institute of Standards and Technology | $1.5 million |
On open notices right now, the most 4520 work comes from Dept of Defense and Department of Veterans Affairs.
Federal spending under PSC 4520 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $25.3 million |
| FY2025 | $34.7 million |
| FY2026 | $38.3 million |
| FY2027 (so far) | $0 |
Who wins PSC 4520 contracts
| Company | Obligated, last 3 years |
|---|---|
| Windward Enterprises, LLC | $10 million |
| Argo Turboserve Corporation | $7.3 million |
| Sikorsky Aircraft Corporation | $6.5 million |
| HDT Expeditionary Systems Inc | $5.3 million |
| The Electric Heater Co | $4 million |
| Atlantic Diving Supply, Inc. | $3.8 million |
| Boneal, Incorporated | $3.7 million |
| Pioneer Industries, LLC | $3.4 million |
| S I T Corporation | $3.1 million |
| Integrated Procurement Technologies | $3 million |
Related PSC codes
- 4510 Plumbing Fixtures and Accessories
- 4530 Fuel Burning Equipment Units
- 4540 Waste Disposal Equipment
Frequently asked questions
What is PSC 4520?
4520 is the product code in the federal Product and Service Code (PSC) Manual for space and water heating equipment, under 45 (Plumbing, Heating, Waste Disposal). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC 4520?
Most federal contract dollars under PSC 4520 go with NAICS 333414 (Heating Equipment (except Warm Air Furnaces) Manufacturing), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC 4520?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 4 open notices use PSC 4520 right now. FedReady can match new ones to your business and email you, free.