Easy to install. the Vinyl Backed Fiberglass Insulation Blankets are designed for gas, oil or electric water heaters up to 60 gallon size. more info - https
Frost King 30 ft. Automatic Electric Heat Cable Kit Accessory HC30A - The Home Depot
Water Heater Insulation Blanket
Insulating the water heater & pressure tank.
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Frost King Fiberglass Water Heater Insulation Blanket SP57/11C - The Home Depot