The Boiler is a medium-sized, rectangular industrial machine with a pixel-art isometric design, featuring a metallic body with visible bolts and seams for a constructed look. It has a prominent front-facing pipe for water input and a top-mounted chimney for steam output, both with simple, angular designs. The main body is textured with a slightly weathered metal finish, suggesting regular use, and is colored in muted industrial tones of gray and blue, with subtle pixelated shading to indicate depth and material.