HOT-WATER BOILER

FIELD: oil producing industry. ^ SUBSTANCE: invention relates to transportation of oil and it can be used to prepare oil in the field for transportation of decrease viscosity at pumping to points of destination. Proposed hot-water boiler contains shell with water volume, upper header with smoke tube, and fire tubes. Shell is furnished additionally with device to provide circulation of medium to be heated made in form of coil and arranged in upper part of water volume, and heat distribution header. Both headers, including header with smoke tube, are installed inside shell with water volume. Fire tubes are arranged under device providing circulation of medium to be heated in row, being connected with heat distribution headers so that central fire tube is connected with lower, and side fire tubes, with upper header furnished with smoke duct with smoke tube. Burner is installed in central tube, and circulation pipes are installed inside side fire tubes. Inlet ends of fire tubes and lower header are provided with three-dimensional covers. ^ EFFECT: facilitated transfer of oil. ^ 3 cl, 4 dwg