Heavy duty Hot water generators come in a number of options and specifications. They can be gas fired three pas, coil type heaters. Their usage in the hospitals, laundry and hotels has increased by manifold due to their efficiency and excellent working. They work without failure and are the best investment for your business. There are various additional characteristics of these hot water generators. Some of them include fuel efficiency up to 90%. They have fully automatic operations so you don’t have to worry at all. Pre-heated combustion air is the main part of these water heaters. They do not require large space and have long life. if any part require change it can be done easily.