EXTERNAL HEATING BOILER Russian patent published in 2011 - IPC F24H1/28 

FIELD: power industry.

SUBSTANCE: external heating boiler includes hydraulic- and heat-insulated housing with soot cleaning device and flow limiting device, gas burner device, automatic thermostatic shutoff-control valve having straight and return boiler lines, stack branch pipe, circulating pump, automatic air discharge device, flexible tube with fittings attaching straight boiler line and return boiler line respectively to straight and return lines of the building heating system, which are arranged inside it. Flexible tube and fittings have moisture and heat insulation. Fitting consists of threaded steel coupling fixed on straight and return boiler lines, threaded nozzle with conical surface of split locking ring installed into groove of flexible tube, coupling nut and sealing elastic sleeve.

EFFECT: cheaper heat generation and easier erection works during assembly and erection of the boiler near the building.

2 dwg