Frost King Water Heater Insulation Blanket. These vinyl-backed fiberglass insulation blankets are designed for gas, oil, or electric water heaters up to 60-gallon size. Package contains a roll of plastic tape for securing blanket around heater. 1-1/2 thick x 48 x 75. R-value is 5. Fits most water heaters up to 60 gallon in sizeReduces standby heat lossesEasy to install with vinyl tape