Tantalum Bayonet Heater F=3.5㎡ https://www.tnztn.com/Tantalum-Bayonet-Heater-F-3-5.html It’s a special type of heat exchanger. There’s a stringer tube inside each tantalum tube. it’s a type of tank immersion heater ideal for heating entire tanks of Fluids. Installed in the side entry of the tank. This allows for good natural convection circulation of the fluid being heated. Mostly used in sulfuric acid concentration. Tell us more, we’ll offer you appropriate solution for your needs of all kinds.