High safety performance, long service life, effective soot treatment, and adoption of standard spherical tube plate; the wing flue has fundamentally solved the problems of cracks, flaws and cylinder bulges of boiler’s tube plate, and improved boiler’s safety. Use internal threaded tubes that improve heat transfer and built-in turbolator technology to improve thermal efficiency. The water spray dedusting technology has greatly reduced soot content. According to use pressure, this product can be divided into three types: normal pressure hot water boiler, pressure-bearing hot water boiler and vacuum boiler.