A Russian-style masonry heater built inside a wooden home in southern Brazil is getting attention for a simple reason: it works. In a video shared by the Recanto Curicaca YouTube channel, Rui shows a brick-built heater that burns a single 15 kg batch of wood, then keeps a 90 m² house warm through the night and into the next day.
The core concept is thermal mass. The heater’s heat storage section used 430 bricks, creating a structure that weighs more than a ton. Instead of sending hot gases straight up the chimney, the design routes heat through internal brick channels before it exits, transferring energy into the masonry along the way.
The heater sits near the center of the floor plan to keep stored heat inside the living space. Rui built a base of stones and cement outside the home’s floor, then added a brick support filled with sand. He used common solid bricks throughout, with refractory materials limited to high-heat areas like the furnace base, the oven base, and one channel.
For mason contractors, the build highlights field lessons that apply to any brick assembly. Rui dry-stacked the heater first, row by row, numbered pieces, disassembled it, then rebuilt it with mortar. He also found that thicker mortar beds increased cracking risk, especially with irregular brick, and that choosing brick sizes before locking in manual dimensions reduced cutting and rework.
In one performance check, the indoor temperature was 23.7°C while it was 8.4°C outside at 9:17 p.m. By 5 a.m., it was still 21.7°C inside compared to 3.7°C outside. The heater takes about 2 hours to heat up, then the couple closes the air intake and chimney damper and lets the masonry radiate.
Rui also swapped a steel door for a cast iron door (34 by 26 centimeters) to avoid warping, added an oven for baking with residual heat, and noted the need for periodic cleaning of smoke ducts and the chimney, especially when burning resinous wood.
Read the full, original article from CPG Click Oil and Gas here.