Frost King Space-Age Material Reflective Water Heater Blanket - R3.5-SP90A - The Home Depot

Frost King

Model # SP90A

Internet # 100170479

Store SKU # 329730

Space-Age Material Reflective Water Heater Blanket - R3.5

Frost King Space-Age Material Reflective Water Heater Blanket - R3.5

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

$23.67 / each


Model # SP90A

Internet # 100170479

Store SKU # 329730

Store SO SKU # 923710

The Thermwell Products Co. Inc. Fiberglass R19 Equivalent Water Heater Blanket helps you save energy by making your gas, oil or electric water heater more efficient. The fiberglass blanket is backed with foil. That enhances insulation to an R19-equivalent level without adding excess bulk to your heater.

  • For use with gas, oil and electric water heaters
  • Fits up to a 60-gal. heater
  • Space-age blanket insulates your water heater for greater efficiency and energy savings
  • Reduces water heater recovery time
  • Durable fiberglass body with R19-equivalent insulation
  • Blanket is backed with foil that enhances insulation without adding excess bulk to your heater
  • Foil tape included


Assembled Depth (in.)  6.0 in  Assembled Height (in.)  75.0 in 
Assembled Width (in.)  48 in  Product Depth (in.) 
Product Height (in.)  75.0  Product Width (in.)  48 
Finish Family  Silver Metallic  Material  Foil & Fiberglass 
Product Type  Blanket/Jacket  Product Weight (lb.)  3.25 lb 
Returnable  90-Day 
Warranty / Certifications
Manufacturer Warranty  90 days 


Rated 3.3 out of 5 by 19 reviewers.
Rated 3.0 out of 5.0 by Online description is NOT accurate; product / tape OK Package says "Acts like R19 Value*" in font that is 1/4 inch high, top center of packaging. Package says " 3.5 R Value" lower down in smaller font. I don't understand the physics of this heat transer equality -- possibly it's the New Math. The ONLINE description states this would cover a 60-gallon water heater, which I would strongly dispute. The ACTUAL PACKAGE does not make this claim, merely has the dimensions of the product adverstised on the package. I own a 40-gallon water heater, and used every square inch of this product to barely cover it. Some advice about cutting it follows. The top of my water heater is 75 inches from the floor, so I made the first cut into the product about 75 inches from the end, making a very long rectangle. This section was taped to the water heater using the supplied tape. The remnant piece was then taped over the exposed area, using the supplied tape. The tape was fine, separated from the backing okay, and had good adhesion to the product. I did not have any left to cover the top. It took me about 20 minutes to install. As the majority of the surface area is the SIDE of the water heater, and not the TOP, I judged the water heater was sufficiently covered. The product itself seems fine, but the advertising of it's capability (R-value and what water heaters it would fit) definitely needs improvement to gain the confidence of the customer. Bottom line: it worked fine for me, but I was annoyed by the inaccuracy of the advertised features. October 29, 2012
Rated 4.0 out of 5.0 by Very good This wrap is the way to go. The extra thermal protection should help say me some money. It was easy to figure out how to install. The only that would have made it better was if the wrap had some form of a cover to the top of the tank. February 25, 2014
Rated 1.0 out of 5.0 by Misleading advertising As the previous reviewer stated, it had a different & lower R value on the package. I asked my local store why? " It WOULD BE R19 EQUIVALENT when added to the insulation already calculated from the water heater itself." NOT what I wanted. Bought the R11 from the store for a lower price but overall higher R value. Only difference was the backing of foil and the thickness of fiberglass. September 17, 2011
Rated 2.0 out of 5.0 by Not R19 -- says R Value 3.5 on packaging This was available in the store, but I bought online because product descriptions says R19 Equivalent.......not sure why you advertise this way when it is not R19 Equivalent on package. October 11, 2011
Rated 4.0 out of 5.0 by good product Instructions a bit vague. No info on which end goes up but is probably my bad. Fit and quality fine. December 10, 2014
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