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Old 11-20-2010, 03:51 PM
 
10 posts, read 48,259 times
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Well inspecting a house, I found that the previous owners has insulated their water heater with some fiberglass insulation. Isn't this dangerous? I've read online that it does save on electricity, but how much does it really help?
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Old 11-20-2010, 04:08 PM
 
Location: Spring, TX
460 posts, read 2,311,270 times
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It's not dangerous unless it's interferring with the vent stack. How much it helps depends entirely on how high you turn up the water heater. If it's already installed on a house you're buying or renting, just leave it. Insulation always provides some help. Whether installing more insulation is worth the cost can be a difficult calculation. For example, the first 12" of insulation provides far more benefit than the next 12", and so on.
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Old 11-20-2010, 04:27 PM
 
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Fiberglass = glass drawn into fibers. Glass is non-flammable. Apart from heating and air-conditioning, the water heater is the biggest household consumer of energy.
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Old 11-20-2010, 08:20 PM
 
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As long as there is no insulation on (a/c heater or gas heater ) exhaust vents, especially made of plastic, paper or other flammable materials, you are OK.

Any insulation on water pipes is a plus though.
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