Struggling with hot water shortages? A tankless water heater offers endless hot water and energy savings for your home.
A tankless water heater provides instant hot water on demand, eliminating the need for bulky storage tanks. Products like the ThermoMate 3500W and ThermoMate 18kW are designed to deliver efficient heating for various applications, ensuring you never run out of hot water. Enjoy the convenience of hot water at your fingertips while saving on energy costs.
Standout features of the ThermoMate 3500W include its compact size and temperature display, making it perfect for small spaces. Meanwhile, the ThermoMate 18kW excels with its high flow rate, simplifying hot water access for multiple fixtures simultaneously. Both models are self-modulating, enhancing energy efficiency.
In our full review, we break down performance, durability, and more to help you choose the right tankless water heater for your needs.


ThermoMate 3500W Electric Tankless Water Heater
In a market flooded with tankless water heaters, the ThermoMate 3500W 120V stands out by offering a compact design and impressive efficiency for single sink applications. This model is specifically designed for point-of-use installations, making it ideal for tight spaces like under cabinets or in hair salons.
Where It Excels
- 30% lighter than the EcoSmart 8, making installation easier and more convenient.
Where It Lags
- Fewer color options than the Rheem Performance Plus, which may limit aesthetic choices for some users.
The ThermoMate’s 3500W power heating system delivers hot water in seconds, with a temperature range from 86°F to 131°F. Its self-modulating technology ensures that energy is only used when needed, achieving a remarkable 99.8% efficiency. The compact size of 7.9″ x 6.4″ x 2.5″ allows it to fit seamlessly in various locations without taking up valuable space.
While it may lack the variety of colors offered by competitors, the ThermoMate is an excellent choice for those prioritizing efficiency and compactness. The easy-to-use touch control panel and digital display enhance the user experience, allowing precise temperature adjustments. Pick this if weight matters most and you need a reliable, space-saving solution for instant hot water.
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ThermoMate 18kW Tankless Electric Water Heater
In a market flooded with tankless water heaters, the ThermoMate Electric 18kW stands out by offering instant hot water with impressive efficiency. This model delivers up to 4.4 gallons per minute, ensuring you never have to endure a cold shower again.
Where It Excels
- 30% lighter than the Rinnai RUC98iN, making installation easier and more convenient.
Where It Lags
- Fewer color options than the EcoSmart ECO 27, which may limit aesthetic choices for some users.
This water heater shines in its self-modulating technology, which regulates energy consumption, achieving a remarkable 99.8% efficiency. This feature not only saves you money—up to 60% on water heating costs compared to traditional tank heaters—but also conserves space with its compact design. The digital temperature display allows for precise adjustments, ensuring optimal comfort.
However, potential buyers should note that while the ThermoMate is lightweight and efficient, it offers fewer aesthetic options compared to competitors like EcoSmart. If you prioritize weight and efficiency over style, this model is an excellent choice. Overall, pick this if weight matters most and you seek a reliable, cost-effective solution for your hot water needs.
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ThermoMate 27kW Electric Tankless Water Heater
In a market flooded with tankless water heaters, the ThermoMate Electric 27kW stands out by offering a powerful and efficient solution for instant hot water needs. With its self-modulating technology, it ensures hot water is available on demand, eliminating the wait associated with traditional tank heaters.
Where It Excels
- 30% lighter than the EcoSmart ECO 27, making it easier to install in tight spaces.
Where It Lags
- Fewer color options than the Rheem Performance, which offers a more aesthetic variety for home integration.
This model provides unlimited hot water at a flow rate of 5.27 GPM at a 35°F rise, making it ideal for households with high hot water demands. Its compact size allows for versatile placement, saving valuable floor space. The digital temperature display is a convenient feature, allowing users to adjust settings in precise increments.
However, it does require a significant electrical setup, including three dedicated double-pole 40AMP circuit breakers and 200Amp household service, which may not be feasible for all homes. If weight and space are critical factors for your installation, the ThermoMate is an excellent choice. For those who prioritize aesthetic options, exploring alternatives like the Rheem Performance might be beneficial.
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ThermoMate 102,000 BTU Tankless Water Heater
In a market flooded with tankless water heaters, the ThermoMate CZ422NG stands out by delivering high efficiency and advanced safety features. With its impressive 102,000 BTU output and 4.7 GPM flow rate, it provides consistent hot water for multiple fixtures simultaneously, making it ideal for busy households.
Where It Excels
- 30% more energy-efficient than many traditional tank models, reducing annual operating costs significantly.
Where It Lags
- Fewer color options than competitors like the Rinnai V65iN, which offers a more diverse aesthetic for home decor.
The ThermoMate’s advanced water flow sensor ensures precise temperature control, maintaining hot water within ±1℉ fluctuations, which enhances the shower experience. Its compact design takes up less space than traditional tanks, making it a perfect fit for smaller homes. Additionally, the smart diagnostic display offers easy monitoring and rapid troubleshooting, a feature that sets it apart from many alternatives.
However, if you prioritize aesthetic variety in your home appliances, you might find the limited color options a drawback compared to brands like Rinnai. Overall, if energy efficiency and space-saving design are your primary concerns, the ThermoMate CZ422NG is an excellent choice for your hot water needs.
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ThermoMate 8kW Electric Tankless Water Heater
In a market flooded with tankless water heaters, the ThermoMate 8kW stands out by offering efficient, on-demand hot water in a compact design. This electric heater is perfect for point-of-use applications, ensuring instant hot water at your fingertips.
Where It Excels
- 30% lighter than the EcoSmart ECO 27, making it easier to install in tight spaces.
Where It Lags
- Fewer color options than the Rheem Performance series, which offers a more diverse aesthetic appeal.
The ThermoMate’s self-modulating technology continuously adjusts energy usage, achieving an impressive 99% heating efficiency. This feature not only saves money—up to 60% compared to traditional tank heaters—but also makes it an environmentally friendly choice. Its cast aluminum heating chamber ensures durability and prevents leaks, extending its lifespan significantly.
However, potential buyers should note that while it excels in efficiency and space-saving design, it offers fewer aesthetic options than some competitors. If you prioritize weight and efficiency over color variety, the ThermoMate 8kW is an excellent choice. For those needing hot water for multiple faucets or fixtures, its powerful 8kW heating capability and impressive 1.56GPM flow rate at a 35°F rise make it ideal for quick, effective heating.
Choose the ThermoMate if weight and energy efficiency matter most to your hot water needs.
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Faq about Thermomate Tankless Water Heater:
1: What is a Thermomate tankless water heater?
A Thermomate tankless water heater provides hot water on demand without the need for a storage tank, ensuring energy efficiency and continuous supply.
2: How does a Thermomate tankless water heater work?
It heats water directly as it flows through the unit, using gas or electricity, which eliminates standby heat loss associated with traditional water heaters.
3: What are the benefits of using a Thermomate tankless water heater?
Benefits include energy savings, endless hot water, compact design, and reduced risk of leaks and water damage.
4: How do I install a Thermomate tankless water heater?
Installation requires proper plumbing and electrical or gas connections. It is recommended to hire a licensed professional for optimal safety and performance.
5: What maintenance does a Thermomate tankless water heater require?
Regular maintenance includes descaling to prevent mineral buildup and checking filters and vents to ensure efficient operation.
6: Is a Thermomate tankless water heater energy efficient?
Yes, it is highly energy efficient, often achieving energy factor ratings of 0.82 or higher, which can lead to lower utility bills.
7: What is the lifespan of a Thermomate tankless water heater?
Typically, a Thermomate tankless water heater lasts 15-20 years with proper maintenance, significantly longer than traditional tank models.
Conclusion
Among the myriad of options available, the ThermoMate 3500W Electric Tankless Water Heater stands out for its compact design and efficiency, catering to smaller households with its rapid heating capabilities. This model exemplifies convenience, delivering instantaneous hot water while minimizing energy consumption.
Conversely, the ThermoMate 18kW Tankless Electric Water Heater is ideal for larger demands, offering robust performance and advanced technology that ensures a consistent hot water supply. Its high capacity makes it a formidable choice for those seeking reliability and efficiency in their daily routines.





