Container SecurityImmersion water heater will not damage your container while heating, no matter what material it is. Please note: Do not touch if you are using a metal bucket. Premium & SafetyThe submersible electric water heater is made of high quality heavy-duty 304 stainless steel protective cover, which can effectively prevent the heating element from direct contact with people or animals, and quickly dissipate the heat into the water through the holes in the protective cover.Sturdy and durable, it can be used many times without causing any damage. Temperature DetectorPut the metal probe in the water while using an immersion water heater, to observe the temperature. Do not put the monitor in water Scope of Application: Put the bucket heater in a container, fill the container with water to completely cover the protective cover of the diving tube heater, and then plug it into a properly grounded 120V AC power outlet. Check the power indicator in the plug to make sure that the immersion heater is on and it will continue to heat the water until it boils. Warning: 1.The portable immersion bathtub heater needs to be completely immersed in water in working condition. 2.Do not use it for more than 3 hours continuously 3.Please do not plug the two heaters into the same outlet to avoid fire hazards. 4.Please take out the heater before touching the water