Accreditation and patents


Company Accreditations and Patents
ISO 9001 Certified Company

Electro Plastics, Inc. is certified as an ISO 9001 company.

ISO (International Organization for Standardization) is the world's largest developer and publisher of International Standards.

US Patent
Electrically Insulated Heating Element

US Patent number: 5,961,869

Inventor: O. Stephan Irgens

EU Patent
Flexible Heating Element

EU Patent number: EP0773704 B1

Inventor: O. Stephan Irgens

US Patent
Power Supply

US Patent number: 8,279,033 B2

Inventor: O. Stephan Irgens

Trademarks ®

International and US Reg. No. 4,149,627 - The mark consists of a stylized flexible heating element

STEP® - Stands for Self-regulating Technology of Electro Plastics

STEP Warmfloor® - brand name for semi-conductive self-regulating heating elements and systems

Product Accreditations
Greener Product  Certified

STEP Warmfloor® is certified by Greener Product  who confirms the product complies with the LEED, LEED for Homes and NAHB standards.

intertek etl listed c us-9700143
ETL Listed, Conforms to UL 1693 3rd Edition - Electric Radiant Heating Panels and Heating  Panel Sets.
ETL Listed, Conforms to UL 5085-1 & 2 and CSA C22.2 No.66 - Safety of Power Supply Units and Similar Products.
ETL Listed, Conforms to UL 823 and ANSI.IS.12.12.01-2000 - Hazardous Locations Class 1 Division 2


ETL Listed, Conforms to EN 60335-2-96: 2009 - Safety of Flexible Sheet Heating Elements for Room Heating
ETL Listed, Conforms to EN 61558-2-2: 2007 - Safety of Power Supply Units and Similar Products.
TUV Rheinland, Conforms to EN 62233:2008 - Magnetic Field Emisson (EMF)
CSTB, Conforms to NF EN ISO 9239-1 & NF EN ISO 11925-2 - Flammability





Power Supplies does not contain led.

TCA - Tile Council of North America

ASTM-C627 – Standard Test Method for Evaluating Ceramic Floor Tile Installation Systems Using the Robinson-Type Floor Tester.

In accordance with the Performance-Level Requirements Guide, the installation is rated for extra heavy and high impact use by the TCA (Tile Council of America)

ABS – American Bureau of Shipping

Certificate of Design Assessment No. 04-HS445756-1-PDA

ABS Rule – 2011 Steel Vessel Rules 1-1-4/7.7, 1-1-Appendix 3, 4-8-2/7.19 &4-8-2/9.1

United States Coast Guard accepted



About Us

Electro Plastics, Inc. dba STEP Warmfloor® is a US manufacturer of electric radiant underfloor heating, roof de-icing and snow melt systems. The company's headquarters is located in Saint Louis, Missouri, U.S.A. This 35,000 sq feet LEED registered building is a "living laboratory" as proof of the comfort properties and energy efficiency of STEP Warmfloor®. 


Our radiant heating products are ETL listed, have the CE marking and conform to ANSI/UL:

 intertek etl small    Cemark small



Contact us

  • Address: 11147 Dorsett Rd., Maryland Heights, MO 63043-3505.
  • Toll-Free: 1-877-STEPTEC(783-7832)
  • Tel: +1-314-426-3555
  • Fax: +1-314-426-3556
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