10 Best Immersion Water Heater For Bathtub 2025 in the United States

The Lakkzoom Immersion Water Heater is designed for those looking to heat water quickly and efficiently, especially for portable bathtubs or small containers. One of its key strengths is its powerful 1500W rating, which allows it to heat up to 5 gallons of water in just a few minutes. The inclusion of a digital LCD thermometer makes it easy to monitor the water temperature, ensuring safety and convenience. The heater is built with a UL-certified stainless steel cover that helps prevent direct contact with the heating element, addressing safety concerns effectively. Additionally, it features intelligent temperature control that automatically shuts off power when the water reaches 75°C (165°F), which enhances its safety profile.

However, there are notable drawbacks to consider. This immersion heater must be fully submerged to operate safely, which means users must be mindful of the water level and follow the instructions closely to avoid fire hazards. Furthermore, it’s not suitable for larger pools, limiting its use to smaller setups like buckets or portable bathtubs. Users should also avoid using it continuously for more than an hour, which could be inconvenient for those needing extended heating sessions.

Portability is a plus, as it's lightweight and easy to bring along for trips, but potential buyers should be aware of the environmental warnings regarding placement near structures or combustible materials. This product is ideal for those who need a quick and portable solution for heating water in small containers, but careful usage is required to ensure safety and efficiency.

The GRILLME 1000W Immersion Water Heater is designed for quick and efficient heating of water in a bathtub or a 5-gallon bucket. With a power rating of 1000W, it ensures rapid heating, supported by its intelligent temperature controller, allowing easy adjustment of water temperature between 32 to 212 degrees Fahrenheit. Featuring a fully submersible design, the heater is made from high-quality stainless steel 316L, offering superior resistance to high temperatures and corrosion compared to standard stainless steel materials.

Safety is a significant focus with this heater, requiring complete submersion during use to prevent damage and equipped with an anti-scalding sheath to protect your container. However, it is not suitable for heating corrosive liquids like well water or seawater, which may limit its versatility for some users. The power cord length of 79 inches and the temperature probe cord length of 118 inches offer ample reach and flexibility in most setups.

Despite its sturdiness, the heater is relatively lightweight and portable, weighing just 2.33 pounds, making it easy to handle and move around. The product comes with a one-year warranty, ensuring peace of mind for users regarding potential damages during normal use. Regular maintenance is required to remove any scale buildup on the heater for optimal performance. Additionally, its effectiveness is best suited for heating tap water rather than other types of liquids. This immersion water heater could be a useful addition for individuals needing rapid water heating solutions in a domestic setting.