A type of heat exchanger with water flowing inside the tubes, which are enclosed in a combustion chamber.
In a water tube heat exchanger, water circulates in tubes heated externally by hot exhaust gases. This type of device is designed to provide maximum thermal output with the smallest possible footprint.
Water tube heat exchangers are relatively compact, which makes them easy to install and transport.
Water tube heat exchangers are able to operate at high pressures, which makes them suitable for use in a wide range of applications. Additionally the pressure drop at the gas side is low.
Water tube boilers can be designed to burn a wide range of fuels, including natural gas and oil.