The twenty-first century marks a new era for the world’s oldest and most reliable heat transfer system—steam. The secret to high tech steam is the trap. The better we trap steam, the more energy efficient and powerful our systems become. Today, with closed-loop systems, electronic controls, and 100% calibrated traps, steam has re-emerged as one of the most cost effective and reliable energy transfer systems for institutional, commercial and multi-unit residential applications.

In a properly designed system, nearly all of the energy used to produce the steam can be delivered to a terminal component or heat transfer device and released. A modern steam system, even an upgrade of a hundred year old system, can actually be more efficient and reliable than any other type of heating system.

Barnes & Jones Articles on Steam

Reevaporation and Its Effect on the Heating System

Limitations of Fixed Orifice Devices

Resource Sheets

Conversion Factors

Orifice Diameters

Steam Table and Definitions

Steam Trap Sizing Capacities

Steam Trap Sizing Rules of Thumb

Eversource – Steam Trap Survey and Repair Offer

Eversource – 2020 Wraps and Traps Gas Savings Package

Series 40 (Old Style) F&T Traps

Links for Steam and Hydronic

Here are links to other steam and hydronic resources on the web including major publications and engineering firms.

Plumbing & Mechanical

The only magazine exclusively serving over 44,000 plumbing, heating, and piping contractors.

PM Engineer

Their editorial mission is to provide specifying and consulting engineers with the most accurate and enlightening information to help them succeed in their technical and business endeavors.

State Supply

The leading national wholesaler of Steam Traps and Steam Trap Repair Parts.

Dan Holohan Associates –

A collection of books and articles on steam and hydronic heating.

California Proposition 65 (officially titled the Safe Drinking Water and Toxic Enforcement Act of 1986, codified at Cal. Health & Safe. Code §§ 25249.5–.13) is a California law that regulates the use of toxic and carcinogenic substances. Under the law, the State of California maintains a list of regulated substances, and if any consumer product contains a listed substance at regulated levels, the product must bear a warning to that effect. The list is updated several times per year. More information about Proposition 65, including the list of regulated substances, can be found on the California Office of Environmental Health Hazard Assessment’s website at:

WARNING: This product can expose you to lead, a chemical known to the State of California to cause cancer. For more information go to: