Extra Edition / Web Exclusive

New Water Heater Standard: Rheem System Goes Beyond

The U.S. water heater industry is implementing a significant product design change that incorporates a new technology — flammable vapor ignition resistance or FVIR — that will help prevent problems caused by improper storage or use of gasoline and other flammable liquids near residential gas-fired water heaters.

As of July 1, 2003, new residential gas-fired units manufactured with storage capacities of 30, 40, or 50 gallons must meet American National Standards Institute (ANSI) standard, ANSI Z21.10.1-2001. (For details on the new standard, see the feature article “Water Heater Design Changes In The Works” in the July 21, 2003 issue of The News.)

Rheem’s Guardian System

The new Rheem Guardian System™ water heater not only meets the new ANSI standard, but also incorporates some unique design enhancements, says the company, including:

  • Air shutoff system: Like all FVIR water heaters, the Guardian System includes a flame arrestor plate to shield the burner and prevent its flame from spreading beyond the arrestor and igniting vapors outside the water heater. But the standard does not cover a sustained flammable vapor incident. Even shutting off the gas supply does not stop vapors from continuing to burn inside the water heater's combustion chamber.

    Because of this, the Guardian System's safety mechanism is designed to completely shut off the air supply to the combustion chamber whenever a flammable vapor incident occurs. This air shutoff system helps ensure that the water heater will shut down quickly and safely. Flammable vapors will starve and extinguish, so flames cannot spread beyond the combustion chamber.

    The Guardian System’s baffled air pathway causes a significant amount of LDO to drop away, preventing it from clogging the arrestor plate.
  • LDO filtration system: The key to long and efficient water heater life is to limit the amount of lint, dust, and oil (LDO) that can reach and clog the arrestor plate, says the company. The design of the Guardian System does this in three ways:

    1. Air flows into the combustion chamber from the sides, not from the floor where dust and dirt accumulate.

    2. One hundred percent of the combustion air is prefiltered by a unique intake design.

    3. The system's air pathway to the combustion chamber is guarded by special airflow baffles that prevent a significant amount of LDO from reaching and clogging the arrestor plate. (See illustration at right.)

    This three-way approach effectively prevents LDO obstruction, the company says.

    For more information, visit www.rheem.com.

  • Did you enjoy this article? Click here to subscribe to The NEWS Magazine

    You must login or register in order to post a comment.



    Image Galleries

    2015 ACCA Conference

    Images from the 2015 ACCA Conference in Grapevine, Texas. Posted on April 8, 2015.


    NEWSMakers: Clint Schreck

    Clint Schreck, general manager, Columbus Worthington Air, Columbus, Ohio, discusses winning Angie’s List Super Service Award, how to handle online reviews, and much more.

    More Podcasts


    NEWS 05-25-15 cover

    2015 May 25

    Check out the weekly edition of The NEWS today!

    Table Of Contents Subscribe

    Legislation and Regulation

    What legislative/regulatory issue is most important to you as a HVAC business owner?
    View Results Poll Archive


    2015 National Plumbing & HVAC Estimator

    Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

    More Products

    Clear Seas Research


    Clear Seas ResearchWith access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.


    Magazine image
    Register today for complete access to ACHRNews.com. Get full access to the latest features, Extra Edition, and more.


    facebook icontwitter iconyoutube iconLinkedIn i con