Thermoboxes are available in two sizes, depending on your fireplace insert. Thermoboxes are top-mounted units filled with Magnetherm granulate that absorb heat from the rising hot flue gases and gradually release that heat again.

Because of their compact size they do not take up much room, they are quick to install and they offer an affordable alternative to thermal storage rings.

Benefits to you:

  • can be used with a variety of fireplace inserts
  • up to 7.5 hours of heat storage
  • lower energy costs
  • environmentally friendly
  • affordable
  • quick to install