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  1. #1
    Join Date
    Nov 2008
    Posts
    1

    Default Water Heater Insulation

    Are water heater insulation blankest effective. Do they damage the hpt water heater?

  2. #2
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,604

    Default Re: Water Heater Insulation

    An insulation blanket is fine for an electric water heater; it can save quite a bit of money. They're generally not recommended for gas water heaters as it's a potential fire hazard. Most water heaters made in the last 10 years have far more insulation than older models and probably don't need the extra blanket. If the water heater is warm to the touch, add insulation. If it's not, don't bother.

    Another thing to consider is where the water heater is located. If it's in a heated area, you won't save much energy. There isn't as large a temperature difference between the hot water and the surrounding air so there'll be less heat lost; and any heat that is lost contributes to the heating of the environment meaning your furnace doesn't have to do as much work. In the wintertime, it's a wash; in the summertime there can be inefficiency if you are trying to keep the space cool.

    When you install an insulation blanket, make sure the top of the water heater is well insulated and the insulation is sealed up, as that's where most of the heat loss is. You can also reduce heat loss by installing heat traps which reduce convection currents that carry heat into the pipes when no water is being used.

  3. #3
    Join Date
    Aug 2008
    Posts
    54

    Default Re: Water Heater Insulation

    Quote Originally Posted by gi11man View Post
    Are water heater insulation blankest effective. Do they damage the hpt water heater?
    Yes, they are effective, giving a savings to investment ratio of greater than 1 to 1. They will not damage the unit, providing it was not manufactured with existing insulation. If so, it will be marked on the waring labels not to wrap it. The known exception is water tanks from Bradford White. Bradford White does not post a warning on it's label, the the manufacturer has stated they should not be wrapped. Don't forget to insulate the water lines, both hot and cold, with foam pipe wrap, but keep at least 6 inches of clearance from any heat source. (flue pipes, etc.)

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