Saves up to 20% of your Water Heating Energy bills, adds R-7.5 to tank performance Lightweight and Easy to Install, Fits Most Gas, Oil and Electric Hot Water Heaters for a 40 50 and 60 Gallon tank, Kit Includes Spacers, Foil Tape and Insulation Hypo-Allergenic Kit, Indoor Air Quality Rated and Non Toxic, No Skin, Eyes or Throat Irritation Passes Stringent California Water Heater Insulation Fire Test, Class1, Class A Fire Rated Increases Recovery Rate of Tank During Cycles, mold and mildew resistant unaffected by humidity and moisture