SIO 18 Pro Flex Energy Guide
Notes to Energy Guide:

Our Challenge

The Department of Energy (DOE) Appliance Standards Program establishes and regulates the energy and water conservation standards established for certain consumer products and commercial and industrial equipment. All appliances that are regulated under the program must be tested and certified according to the standards established by the DOE.

Currently, DOE has no test criteria nor classification for the patented Quartz Infrared technology for heating water. The Certified Testing Laboratory we used for our Uniform Energy Factor (UEF) rating had no prior experience with Quartz Infrared technology and could only use the existing procedures issued by DOE for their testing. The tests were conducted under 10 CFR Appendix E to Subpart B of Part 430 - Uniform Test Method for Measuring the Energy Consumption of Water Heaters Sec 6.4.4. This test procedure assumes electric resistance heating elements.


When we submitted our test results to DOE for listing with the U.S. Department of Energy Compliance Certification Management System (CCMS), the only category SioGreen fit into was "Instantaneous Electric Water Heater". This category includes all electric tankless water heaters. All of which use some form of an "Electric Resistance" heat source to heat water and does not accurately represent the SioGreen technology. In addition, the DOE EnergyStar program has no classification for any electric tankless water heaters and will not rate them. (See the Energy Star discussion here)

The California Energy Commission, which is arguably one of the most stringent regulatory bodies, defers to DOE and also has a classification for "Electric Instantaneous"; however, they only recognize "Electric Resistance" as the energy source. 

Until the DOE testing procedures and classifications catch up to new technology, the resulting test data will have questionable value when comparing products.  

In spite of this situation, we have  prepared this Energy Guide based on existing procedures and guidelines and according to the existing DOE formula, DOE430E2014_Eannual = 365 * ((V * p * Cp * 67) / (UEF)). It is accurate to the best of our knowledge.