Frost King Fiberglass Water Heater Insulation Blanket-SP57/11C at The Home Depot
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Frost King

Model # SP57/11C

Internet # 100139225

Store SKU # 417920

Fiberglass Water Heater Insulation Blanket

Frost King Fiberglass Water Heater Insulation Blanket

This item has been discontinued.
The Home Depot no longer carries this specific product.

$20.47 / each
Item cannot be shipped to the following state(s): AK,GU,HI,PR,VI


Model # SP57/11C

Internet # 100139225

Store SKU # 417920

Store SO SKU # 923710

The Thermwell Products Co. Inc. Fiberglass Water Heater Insulation Blanket fits up to a 60-gal. tank. It is compatible with both gas and electric water heaters. This blanket helps you save energy by reducing your water heater's recovery time.

  • For use with both gas and electric water heaters
  • Fits up to a 60-gal. tank
  • Insulates a water heater
  • Reduces water heater recovery time to save energy
  • Durable fiberglass body with R-10 insulation


Assembled Depth (in.)  10 in  Assembled Height (in.)  25.5 in 
Assembled Width (in.)  10 in  Finish Family  White 
Manufacturer Warranty  180 days  Product Depth (in.) 
Product Height (in.)  48  Product Type  Blanket/Jacket 
Product Weight (lb.)  4.95 lb  Product Width (in.)  75 
Returnable  90-Day 


Rated 3.6 out of 5 by 49 reviewers.
Rated 3 out of 5 by Barely Fits around 50 gal water heater Package says fits up to most 60 gal water heaters. It barely fit around my 50 gal. I have an electronic Whirlpool water heater and it kept messing up due to the cold so that is why I bought this. It does serve the purpose of covering up the digital display and keeping it warm. It actually did not completely fit around my water heater. There is probably a 2-3 inch gap where I had to tape it to the water heater all the way down for it to stay. If I would have stretched it probably would have fit, but if you compress insulation it decreases its R-value which defeats the purpose. I also must say that the tape that comes with it works extremely well. December 14, 2013
Rated 4 out of 5 by Product is ok but could be better. I installed the insulating blanket around a new 40 gal. electric GE water heater and just had enough to reach around the tank. I had no extra material to finish covering the top of the tank. For the price of the Kit they should include more material. Tip: For additional insulating value add an 1" block of high density foam under the tank, if an electric water heater. September 17, 2013
Rated 3 out of 5 by Does not fit stated sizes and messy Horrendous amount of fiberglass "dust". Much more so than any fiberglass insulation I've installed. After installing this my hands and clothing sparkled like they had been sprinkled with glitter. "Tools" needed should include a respirator. Had measured my water heater so I knew what size I was looking for but this certainly won't fit the advertised size...unless "fit" no longer means completely covers. Too soon to tell how much this will save on the heating bills but adding insulation is never a waste in the long run. Might be better off using left over home insulation (with backing) if you have any. December 11, 2013
Rated 1 out of 5 by Waste of money This doe not fit my 50gal tank. It's way too short in height and wrapping around. It's a mess to even bother removing it to return to the store. The outer side of this insulation has a very thin plastic covering which tears easily. The tape is useless. There is no backing on the inner side, it is just bare Fiberglas itchy mess. Don't waste your money. January 26, 2013
Rated 5 out of 5 by Great Buy It was easy for one person to install and was done in minutes. August 19, 2014
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