In addition to direct fired gas water heaters, A.O. Smith manufactures storage tanks, either with or without integral heat exchangers, in the range of 289-2800 litres. Tanks without a heat exchanger are called ‘ST’ tanks, those with one coil are ‘IT’ tanks and those with twin coils are called ‘ITS’.
Indirect water heater for a wide range of applications. The IT is fitted with 1 heat exchanger. This appliance is available in capacities varying from 296 to 2800 litres.