Magic Heat is the only UL listed heat reclaimer on the market. Magic Heat reclaims up to 30% of lost heat form your heating appliance and distributes it into your home using only .31 amp of power, roughly equivalent to a 40 watt lightbulb. Magic Heat is designed for heating appliances with inside flue temperatures exceeding 350 degrees and surface temperatures of the single wall pipe below the Magic Heat exceeding 280 degrees. The bottom crimp design makes this unit ideal for wood burning heating applications by containing any creosote within the chimney. A toggle switch allows the 225 CFM fan to operate in two modes, either run continuously or a pre-set thermostat automatically turns the blower fan on when the Magic Heat casing reaches 150 degrees and off at 120 degrees. Magic Heat is easy to install and must be installed between 12 and 24 inches from the appliance flue outlet using single wall connector pipe. How it works: As hot flue gases travel from your heating appliance upward through the flu, they heat the transfer tubes in the inner case. Fresh room air enters thru the back vents and is heated while traveling through the transfer tubes. The 225 CFM fan pushes out the warmed air through the tubes and into your home reclaiming up to 30,000 British Thermal Units (BTU) of lost heat. Flue gases are not restricted and continue up your chimney. Magic Heat is available in 6", 7" and 8" pipe diameters for wood, oil/coal or natural gas burning heating appliances. Manufactured in the USA.