1. Electronic regulation	14. Thermometer
2. Upper door	15. Thermal fuse /breakdown thermostat/
3. Pull rod of chimney flap	16. Outer water hub
4. Feeding chamber	17. Upper back cover
5. Lead off primary air	18. Burning up flap
6. Fan flap	19. Cover of exchanger
7. Flap	20. Flue branch
8. Heatproof shaped piece – jet	21. Exchanger pipes
9. Covering of secondary air	22. Heatproof
10. Door seal	23. Secondary air
11. Fireclay shaped pieces	24. Combustion chamber
12. Bottom door	25. Direction of combustion gas
13. Upper front cover	26. Inlet of returnable water
	27. Fill in branch