Thursday, December 8, 2016

Brick Oven and Masonry Heater Combo

Many masonry heaters (brick fireboxes that are lead through baffles and are designed to radiate heat through the mass of the masonry) have a small oven built into the flue system.

Great heater, tiny oven (above)
baffled flue
Although I appreciate the addition of this small oven, I haven't found that tiny ovens satisfy the baking needs of even a small home.  A 36" interior diameter oven, the most common residential size I build, would be a better match.  But how to combine the purposes.

Masonry heaters are designed to transfer heat for a long time; brick ovens to contain heat for a long time.

I am in the process of building both into the same masonry.  However, I am separating the functions.  A space behind the oven will contain the masonry heater apparatus.  The exit flue of the oven will enter the upper most chamber of the masonry heater (masonry heaters often have a bypass channel).  The brick oven will have its own damper.  Since a portion of the masonry heater's mass is the rear wall of the oven enclosure, I have designed vents in the oven container for the periods when the heater is active.

This way, on OR the other OR both heater and oven can run when desired.  This being built in a large conservatory, the moderated temperatures in winter will make Spring in January.

The design of my oven AND heater.  Firebox for heater is at left back.


  1. Hi David,
    Do you loose efficiency if an oven is built into the masonry heater?

    Thank You,

  2. This oven is separate from the masonry heater but shares one wall. the oven is insulated all around so it doesn't lose heat and the masonry heater is built to conduct heat to the exterior. Separate fireboxes.