10 Best Booster For Water Heaters 2025 in the United States

The Stiebel Eltron Tempra 24 Plus is a tankless water heater that caters to users seeking a continuous hot water supply without the interruption of traditional heaters. Its advanced flow control technology ensures a consistent temperature, making it suitable for households needing reliable hot showers. The compact design is a space saver and eco-friendly, as it includes auto-modulation to manage energy usage efficiently.

With a 24kW power rating and a wide output range from 68°F to 140°F, it is versatile for different household needs. However, it requires a significant minimum electric service of 150 A, which might be a drawback for homes not equipped to handle such a load. The installation could also require professional assistance, adding to the initial cost. Safety is addressed with options to limit maximum water temperature, preventing scalding risks. Additionally, with warranties covering leakage and parts, it promises durability and reliability.

The LED display and user-friendly controls enhance its usability. Despite its higher initial installation requirements, its energy-saving benefits could lead to reduced costs in the long run. This model is ideal for those prioritizing energy efficiency and consistent hot water delivery for a whole house, assuming their electrical setup meets the requirements.

The Rheem RTEX-36 36kW Electric Tankless Water Heater is a robust choice for those seeking a powerful and efficient booster for their water heating needs. With a power rating of 36 kW and a maximum flow rate of 6 gallons per minute, it can comfortably serve households with moderate hot water demands. The model operates at 240 volts, making it suitable for most residential installations.

One notable strength of this unit is its energy efficiency, boasting a 99.8% efficiency rate, which means lower energy bills and a greener footprint. Additionally, the digital temperature control allows for precise adjustments, ensuring the water temperature is always just right. Its compact and stylish design also makes it a good fit for spaces where aesthetics are a consideration.

However, there are some points to consider before purchasing. The installation requires a 240V electrical connection, which might not be available in all homes without some electrical upgrades. While its flow rate is adequate, it might fall short for larger households or those with high simultaneous hot water usage. Safety features are not elaborated upon, so it's important to ensure that the unit complies with your local safety standards. Customer feedback is generally positive, with a 4.4 out of 5-star rating, indicating user satisfaction, but the sample size is quite small. This water heater is well-suited for medium-sized households looking for an efficient and stylish unit, but make sure your home meets the necessary electrical requirements for installation.

The Eemax EEM24018 Electric Tankless Water Heater offers a strong solution for those needing an efficient and space-saving option. With an 18 KW power rating, it promises instant and consistent hot water by utilizing advanced self-modulating technology. This feature ensures the unit only uses energy according to the demand, which can be appealing for those wanting to cut down on unnecessary energy usage. The tankless design means it provides endless hot water, ideal for continuous usage without the need for a storage tank.

In terms of compatibility, potential buyers must ensure this model suits their hot water needs, as it supports a water consumption rate of up to 3.5 gallons per minute. Its compact size (14"W x 17"H) makes it suitable for homes with limited space. Safety and installation are simplified due to its pressure rating requirements (minimum 25 psi, maximum 150 psi) and the fact that it features a digital temperature control adjustable in 1°F increments, ranging from 80°F to 140°F.

Its digital interface and energy efficiency (99.8%) are commendable, although installation might require professional help, especially if users are unfamiliar with electrical installations. Additionally, while it has a warranty of 5 years for leaks and 1 year for parts, potential purchasers should consider the long-term durability and maintenance of the product. This product is particularly well-suited for individuals or families looking to upgrade to an energy-efficient water heating solution without compromising on performance or convenience. Ensuring proper compatibility with existing plumbing and electrical systems is essential for optimal functionality.