Safety Design: This UL-certified tankless water heater features a high-quality stainless steel shield that effectively protects the heating element from direct contact with humans or animals. It's rust-resistant and durable. Our immersion water heaters feature a smart temperature control design that automatically shuts off when the water temperature reaches 75C (165F). Warning: When using, place the water heater in water and ensure it is fully immersed before plugging it into an electrical outlet. Knowing the correct operating sequence can effectively prevent fires.Fast Heating: This high-power 2500W electric water heater heats up to 8 gallons of water in minutes. The holes in the shield allow heat to dissipate more quickly into the water. The water heater must be fully immersed in water during use. Remove the immersion water heater before contact with water. Warning: The recommended operating time is no more than one hour. If you need to heat a large amount of water quickly, you can use multiple water heaters simultaneously, but never plug two water heaters into the same outlet to avoid fire.Versatile: Our portable pool heater is suitable for portable bathtubs, mini pools (when using multiple), sinks, buckets, washbasins, and more. When using, ensure the container is large enough to hold hot water. This convenient and lightweight immersion heater is perfect for travel and road trips. Please note that it is not suitable for use in large swimming pools. Warning: Environmental Concerns: When using an immersion heater, do not operate this device within 3 feet (1 meter) of any structures, flammable materials, or other gas cylinders. Doing so increases the risk of fire.Easy to Use: Submerge the electric submersible water heater in water to the appropriate level and then plug it into any grounded 110V AC outlet. It features a digital LCD thermometer for convenient water temperature measurement. Check the power indicator to ensure the immersion heater is functioning properly. Important: Keep people and animals away from the water while the heater is operating. Warning: Always ensure the heater is completely submerged in water while operating. Never leave any parts of the heater exposed to air, as this can cause a fire.