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Code/Requirements

There are a few basic requirements for all masonry heater installations. To determine whether you are able to install a masonry heater check your City and State regulations.

  • If a masonry heater is placed near a non-combustible material such as a dry-wall interior wall you must be a minimum of 4” from the wall. We typically install our units at 5” simply because we have found that it allows the most room for the rear of the unit to radiate the heat into the surrounding room while still being close to the wall.
  • The building code requires a non-combustible floor in the hearth area (spark protection zone in front of the firebox). Please check with your building department. ASTM E 1602-94 recommends 16” depth in front of the firebox and a width that extends 8” on each side of the firebox. You can achieve this by making the foundation or pad beneath the heater with this added space or we can install a FOAMGLAS insulating barrier. The FOAMGLAS allows us to build the heater on combustible materials such as a wood floor. The 16” area in front and 8” to the sides of the fuel door can be then covered with any tile or non-combustible finishing material.
  • All of our masonry heaters require a double-wall insulated fluepipe. The smaller units will have a 6” inside diameter pipe and the larger units will use an 8” inside diameter fluepipe.

Basic clearances to combustibles:

  • 4 in. to combustible framing from masonry heater.
  • 8 in. to ceiling.
  • 8 in. minimum extent of side wall heat shield above firebox door.
  • 8 in. hearth extension (sides).
  • 16in. hearth extension (front).
  • 48 in. in front of fuel-loading doors to combustible framing.
  • 4 in. minimum clearance from side wall of masonry heater to heat shield (if used) or combustible framing.