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 EcoSmart ECO 24 is a powerful and efficient electric tankless water heater designed to boost water heating systems. With a power rating of 24,000 watts and a maximum flow rate of 5.8 gallons per minute, it is capable of providing substantial hot water for residential use. One of its standout features is the patented self-modulating technology, which adjusts energy usage based on the water flow, enhancing efficiency and saving on energy costs.

Additionally, the unit boasts an impressive 99.8% energy efficiency rating, making it an eco-friendly choice. The digital output temperature display allows for precise control over the water temperature, which can go up to 130 degrees Fahrenheit, meeting various household needs comfortably. Compatibility-wise, it operates on a 240-volt system and requires a 100 A circuit breaker, making it suitable for modern electrical setups.

Installation requirements include wall mounting and rough plumbing, which might require professional assistance for optimal setup and safety. The included lifetime warranty on electronics, exchanger, and element is a notable benefit, although it does not cover labor or incidental damages. One potential drawback is the initial installation complexity, which might be daunting for some users. Additionally, while the product is compact and lightweight at 14.25 pounds, ensuring proper installation is crucial for its performance and longevity. Safety features are inherent in its design, but users must adhere to installation guidelines to avoid issues. The EcoSmart ECO 24 is regarded as a robust and efficient option for enhancing water heating systems in residential settings.