BOILER PLANT Russian patent published in 1998 - IPC

FIELD: individual heating systems. SUBSTANCE: boiler plant includes domestic boiler 1 whose upper portion is connected with gas duct 2 and direct heating line 3. Lower portion of gas duct 2 is made in form of economizer which consists of heating internal jacket 4 and hot-water external jacket 5 connected with direct heating line 3 forming circular section at central position of tube 6 having rounded-off ends. Tube 6 is mounted coaxially relative to supply tube 7 and discharge tube 8 of direct heating line 3. Hot-water external jacket 5 forms water heating column and heating outer jacket 4 is simultaneously used as inner tube of water-heating column. EFFECT: enhanced efficiency. 1 dwg