We manufacture a range of heaters specifically for caustic solutions.
The material used for all wetted / heated parts is 316L Stainless Steel. This is generally impervious to corrosion in normal use.
Useful corrosion data can be found at the page HERE
Heater shown is our Z type flanged unit with one removable element plus Control and Safety (Manual Reset) Thermostats. Typical ratings are between 3 and 6 KW. The X type heater has multiple elements suitable for heavy duties up to 100kW.