... 4. Intelligent control system: PLC and 5.7 touch panel, multi-level protection.5. Fiberglass heat preservation: low surface temperature and heat ... 6. Corrugated hearth: more safety and increase convection.7. Multi-level sealing for flue gas chamber: no flue gas leakage.8 ... output. 10. Main components, such as burners, pumps, water level meters, valves are limited to renowned brands. 11. Stainless steel ...