Do-It-Yourself (DIY)
Behind Hot Water Radiator

R-3 and a Radiant Reflector

In order to increase the heat transmitted to the interior of a room by a hot water radiator, attach Reflectix® Insulation to the wall directly behind the unit. The product reflects 94% + of the energy that would ordinarily be absorbed by the wall. This will result in a more comfortable room at a lower thermostat setting. The product is easy to handle and installs very cleanly.

Recommended Products:
Double Reflective Insulation
Reflective/Bubble/Bubble/Reflective - Roll
• BP24025 (24” x 25’)
• BP48025 (48” x 25’)

• R-3
• Radiant reflector (Reflects 94% + of the radiant heat generated towards the wall behind the unit)
• Easy to install
• Very clean, finished look
• Easily withstands the temperature of the radiator when installed properly

Testing and Certification:
Reflectix® products are thoroughly tested at either nationally approved, independent laboratories or leading universities. Tests are performed to current American Society of Testing and Materials (ASTM) standards when a standard exists. To obtain a copy of our Product Testing Specifications, please refer to our website “Literature Tab” above. The documents are also available by e-mail at or call 800-879-3645.

Air Space Requirements:
Click here for DIY Air Space Requirements (Revised 0615).pdf

Installation Instructions:
Download DIY Behind Hot Water Radiator Installation Instructions 0910.pdf
• Measure the width and height of the hot water radiator. It is personal preference (if and) to what degree the product extends beyond the top and sides of the radiator.
• Simply cut the Reflectix® Reflective/Bubble/Bubble/Reflective product to this dimension.
• Install product flush to the wall and without any contact to the radiator or plumbing.
• Secure the product to the wall utilizing a double sided tape, Velcro strips, spray adhesive or staples.


Additional Resources:
F1 - Energy Saving Solutions for the Homeowner (Revised 0711)
F2 - Solutions for the Pro (Revised 0416)
Zip Code Zone Locator
This function provides regional installation recommendations for the following applications: Attic & Cathedral Ceiling
DIY Product Calculator Type:
Roof/Attic Application: Radiant Barrier Locate a Retailer
0 sq. ft. of roof/attic area 0 rolls
*Note: This calculator is for the convenience of our customers. These recommendations are for approximate product quantity.

Video Library:

For additional videos, click here.
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