Water Heater Blanket
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A water heater blanket is a blanket like material made of fiberglass insulation that is wrapped around a home water heater to prevent heat loss.
- "Unless your water heater's storage tank already has a high R-value of insulation (at least R-24), adding insulation to it can reduce standby heat losses by 25%–45%. This will save you around 4%–9% in water heating costs. If you don't know your water heater tank's R-value, touch it. A tank that's warm to the touch needs additional insulation. Insulating your storage water heater tank is fairly simple and inexpensive, and it will pay for itself in about a year. You can find pre-cut jackets or blankets available from around $10–$20. Choose one with an insulating value of at least R-8. Some utilities sell them at low prices, offer rebates, and even install them at a low or no cost."
- SOURCE: http://web.archive.org/web/20120906013629/http://www.energysavers.gov:80/your_home/water_heating/index.cfm/mytopic=13070