Blanket for new gas water heater ?


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Old 01-20-15, 01:51 PM
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Blanket for new gas water heater ?

Just replaced old ge gas 40 gal with Rheem gas 40 gal. Model # XG40T09HE40U0,9 yr warranty..Is it worth about $25 heater blanket??
 
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Old 01-20-15, 02:03 PM
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I wouldn't use one of those blankets/jackets. If a new water heater needs one of those, there is something wrong. Also, not all manufacturers recommend them.
 
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Old 01-20-15, 02:14 PM
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Agree with Pulpo. Do you have it a cold or outdoor location? What makes you think you need to add insulation? Today's units are made with the latest technology available to conserve energy.
 
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Old 01-22-15, 02:31 PM
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A blanket must leave a clear area around the gap in the vent pipe at the top of the water heater and keep the intake louvers at the bottom of the heater clear.

Today's water heater insulation is probably good enough that more heat is lost from the water via the center flue compared with through the outside jacket. The same mechanism (turbulator strip) that captures heat from the exhaust gases to add to water heating will lose heat back to eddy currents going up the flue when the burner is off. So the amount of additional heat loss retardation afforded by the blanket is quite small.

Somehow I am still in favor of buying (if available) water heaters without an electrically powered damper to stop the eddy currents going up the center flue. This is an additional component that adds to the water heater price, can malfunction, and prevents the water heater from operating during a power failure.
 
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Old 01-22-15, 06:04 PM
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I don't see any real harm in adding the insulation blanket as long as the instructions are followed and the blanket is kept away from the vent, the T&P relief valve and the gas valve/control area.
 
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Old 01-22-15, 07:35 PM
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Ask the manufacturer first.
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