Building a Tiled Masonry Heater
Hot combustion, heat-exchange channels, and six tons of brick for energy efficiency and a clean burn.
Synopsis: This article details construction of a masonry heater, which uses a very high thermal mass to store and release heat slowly. The author covers construction of the firebox and internal passages that make the heater so efficient.
A century ago, Mark Twain declared that masonry heaters could heat a home comfortably all day after one firing, consuming “no more fuel than a baby could fetch in its arms.” In comparison, he called the American woodstove “a terror” that wastes so much wood it makes you “think you have been supporting a volcano.” No wonder he was perplexed that the U. S. had yet to adopt the masonry heater as its own.
Nowadays, site-built and factory-built masonry heaters are appearing in the U. S. with a flourish that would have dazzled Twain. Nevertheless, they are still virtually unknown in my hometown. That’s why I set out to build a showcase model. As a masonry contractor, I wanted to demonstrate how effectively such a fireplace (as opposed to a standard masonry fireplace) produces and stores heat, releasing it uniformly over a long period of time. I also wanted to show how adaptable it can be to a home’s style and decor.
My clients, John Hosemann and Joan Carney, were ideal.They were in the early stages of designing a new home and were searching for a fireplace that would actually heat it. John had lived with conventional masonry fireplaces in two previous homes and didn’t want another “hole-in-the wall.” Joan insisted only that the fireplace be beautiful. They both wanted to be able to view the fire.
They also gave me an excellent location to work with—right near the center of the house.The front of the fireplace would face the living room, dining room, and kitchen; the back…