As a home improvement specialist with years of experience in the field, I have had the opportunity to evaluate numerous products and technologies that enhance the comfort and efficiency of residential spaces. When it comes to tankless water heaters, a crucial component in providing continuous hot water supply, it's essential to consider factors such as energy efficiency, installation type, flow rate, and the manufacturer's reputation.

**The Best Tankless Water Heaters on the Market**

1. **Rheem RTEX 13 Electric Tankless Water Heater**
- The Rheem RTEX series is well-regarded for its reliability and efficiency. The RTEX 13 model offers a compact design and is perfect for homes with 1-2 bathrooms. It features a self-modulating technology that adjusts the energy input to match the demand, ensuring optimal performance and energy savings.


2. Stiebel Eltron Tempra Plus 24 kW
- This model from Stiebel Eltron is a favorite among homeowners who are looking for a balance between performance and energy efficiency. With a 24 kW output, it can handle the demands of larger households and is known for its longevity and consistent hot water supply.


3. Rinnai RUC98iN Ultra Series
- Rinnai is a brand synonymous with quality and innovation in the tankless water heater market. The RUC98iN Ultra Series model is designed for both indoor and outdoor installations and offers a concentric/twin pipe installation option, which simplifies the setup process.

4. **Atmor AT-D18TP-AZ Instant Tankless Water Heater**
- The Atmor AT-D18TP-AZ is an excellent choice for those seeking an affordable yet efficient tankless water heater. It has a high energy factor and is equipped with a self-diagnostic system that makes troubleshooting and maintenance easier.


5. Ecosmart ECO 27 Tankless Water Heater
- Ecosmart is known for its eco-friendly products, and the ECO 27 is no exception. It is designed to save energy and reduce environmental impact while still providing a steady flow of hot water for households with up to 3 bathrooms.

6. **Rheem RTGH-95DVLN Direct Vent Tankless Water Heater**
- For those in colder climates or with larger homes, the Rheem RTGH-95DVLN is a robust option. It features a direct vent system that allows for efficient heat exchange and is capable of supplying hot water to multiple fixtures simultaneously.

When selecting the best tankless water heater for your needs, it's important to consider the size of your household, the number of bathrooms, and the average water usage. Additionally, the type of fuel used by the heater (electric, gas, or propane) and the warranty offered by the manufacturer are also significant factors.

Installation and Maintenance
Tankless water heaters require professional installation to ensure they function correctly and safely. Maintenance is also crucial to prolong the life of the unit and to keep it running efficiently. Regular check-ups and filter replacements are recommended.

Energy Efficiency and Cost Savings
One of the main advantages of tankless water heaters is their energy efficiency. Unlike traditional tank water heaters that continuously heat water, tankless models only heat water as it is needed, reducing energy waste. This can lead to significant cost savings over time.

Conclusion
Choosing the best tankless water heater involves a careful assessment of your home's needs and the features offered by each model. By considering the points mentioned above and consulting with a professional, you can make an informed decision that will provide your home with a reliable and efficient hot water supply.

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7 Best Tankless Water Heaters in 2018 Reviewed1 Rheem RTEX 13 Electric Tankless Water Heater.2 Stiebel Eltron Tempra Plus 24 kW.3 Rinnai RUC98iN Ultra Series, Concentric/Twin Pipe Installation.4 Atmor AT-D18TP-AZ Instant Tankless Water Heater.5 Ecosmart ECO 27 Tankless Water Heater.6 Rheem RTGH-95DVLN Direct Vent Tankless Water Heater.More items...read more >>