| 摘要 |
<p>A wood boiler surrounded on five sides by a water jacket with a series of water-carrying pipes forming a grate adapted to hold the wood while burning and an exhaust pipe extending through the top of the water jacket beside a tankless coil for producing hot water, and a return duct provided at the junction of the exhaust pipe and the chimney adapted to return condensates to the combustion chamber.</p> |
