... commercial places where need much hot water and heating.Such as hotel,factory,school,hospital,military,villa,village etc.Commercial ... of inflammable,explosive,electric shock,gas poisoning6.Saving cost as high as 60%-80% compared with oil boiler,gas boilerLarge ... and heating.Such as school,factory,hotel,hospital,military,villa,village etc. MODELYYJ-AS-3.5YYJ-AS-5YYJ-AS-6.5YYJ-AS-9Reted heating ...