Andrew Grzadziel, owner of GRZ LLC, has over 30 years of experience in design and construction and a degree in civil engineering.  He designs and builds custom high-efficiency masonry heaters and kachelofens . As a Certified Heater Mason, Andrew applies his knowledge to design custom heaters to meet the aesthetic and functional needs of his clients.  In addition, Andrew is also a Certified Rumford Fireplace Mason.

Clients may choose to include in-bake ovens and benches in their designs.  They may also elect to use brick, ceramic tile, soapstone, stucco, or other varieties of stone for the structural surface of their heaters.