Thermomate or MIZUDO? Tankless Water Heaters Compared in 2026
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When comparing thermomate vs MIZUDO tankless water heater options, you are actually looking at two mini-tank models designed for point-of-use installation. Both units are electric, plug into standard 120V outlets, and fit under sinks. The main difference lies in their storage capacity and internal construction. Thermomate offers a 6.5-gallon tank with UL listing, while MIZUDO provides an 8.0-gallon capacity with CSA certification and a magnesium anode rod. You choose based on space and hot water volume needs.
Key differences
| Aspect | Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank | MIZUDO 8-Gallon 120V Mini-Tank Water Heater |
|---|---|---|
| Capacity | 6.5 Gallons | 8.0 Gallons |
| Dimensions | 17.7 x 17.7 x 14.6 inches | 17.32 x 20.8 x 15.35 inches |
| Certification | UL Listed | CSA Certified |
| Wattage | 1.44 kW | 1440W |
| Anode Rod | Not listed | Magnesium |
| Max Temperature | 149°F | 145°F |
Which one should you choose?
Choose Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank if
- You need a compact footprint with a square base for tight under-sink corners.
- You prefer a higher maximum temperature setting of 149°F.
- You want UL certification for electrical safety standards.
Choose MIZUDO 8-Gallon 120V Mini-Tank Water Heater if
- You require more hot water capacity with an 8.0-gallon tank.
- You want a magnesium anode rod to protect the tank from corrosion.
- You need CSA certification and an IPX4 waterproof rating for damp areas.
Verdict: Choose the Thermomate if your space is limited by width and you need slightly hotter water. Pick the MIZUDO if you need more stored hot water and corrosion protection from the anode rod.
Thermomate vs MIZUDO Mini-Tank Specs
Capacity
The MIZUDO model offers an 8.0-gallon storage tank, providing more hot water for tasks like handwashing or dish rinsing. The Thermomate unit holds 6.5 gallons. While both are point-of-use heaters, the larger volume in the MIZUDO means you can run fixtures longer before the tank needs to recover heat. This extra capacity is useful if you have higher demand at a single sink. The Thermomate is sufficient for low-flow applications but provides less buffer. If you need more hot water per session, the MIZUDO has the advantage.
Wattage
Both heaters operate at 1440 watts on a 120-volt circuit. This shared wattage means they draw similar electrical current and heat at comparable rates. The Thermomate lists 1.44 kW, while the MIZUDO specifies 1440W. Since the power input is identical, the speed of recovery depends more on the tank size and heating element design. You will not see a difference in energy draw or heating speed based on wattage alone. Both units require a dedicated circuit breaker, typically 15 amps, to operate safely. This is a neutral comparison.
Dimensions
The Thermomate measures 17.7 inches in height, 17.7 inches in width, and 14.6 inches in depth. The MIZUDO is slightly taller at 20.8 inches, with a width of 17.3 inches and a depth of 15.35 inches. The Thermomate has a more compact footprint, which may fit better in tighter under-sink cabinets. The MIZUDO is wider and taller, requiring more vertical and horizontal space. If you have limited clearance, the Thermomate’s square design offers better flexibility. For larger cabinets, the MIZUDO fits easily. The Thermomate wins on compactness.
Temperature Range
The Thermomate allows you to set water temperature from 50°F to 149°F, with a freeze mode to protect the tank in cold environments. The MIZUDO offers a range of 55°F to 145°F. The Thermomate provides a lower minimum setting and a higher maximum temperature. This wider range gives you more control for specific needs, such as lower temperatures for efficiency or higher heat for sanitizing. The MIZUDO’s high-temp limit shuts off at 167°F, which is a safety feature, not a user setting. The Thermomate offers greater adjustability.
Certification
The Thermomate is UL Listed, ensuring it meets safety standards for electrical and fire hazards. The MIZUDO is CSA Certified, which is also a recognized safety standard for North American markets. Both certifications indicate that the units have passed rigorous testing for safe operation. You do not need to choose one based on safety credentials, as both are approved for use. The MIZUDO also includes an IPX4 waterproof rating, adding protection against splashes. This gives the MIZUDO a slight edge in moisture resistance, but both are safe.
Which Mini-Tank Suits Your Needs
You need maximum hot water volume
The MIZUDO model holds 8.0 gallons, offering more stored hot water than the Thermomate's 6.5-gallon tank. This extra capacity supports continuous use for handwashing, dish rinsing, or food prep. The larger volume helps you manage higher demand without running out of warm water quickly during extended tasks.
You want certified safety standards
MIZUDO carries CSA certification, which verifies compliance with specific safety and performance standards. The Thermomate lists UL listing, a common safety mark. If your priority is third-party verification of electrical and thermal safety protocols, the CSA certification on the MIZUDO unit provides that documented assurance for your home.
You prefer adjustable high temperatures
The Thermomate thermostat reaches up to 149°F, slightly higher than the MIZUDO's 145°F limit. This extra heat allows for better sanitization of dishes or hands. If you need water at the maximum possible temperature for hygiene or specific cleaning tasks, the Thermomate offers a higher peak setting for your needs.
The products compared
Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank
Best for: single sink point-of-use hot water
- Fuel Type
- Electric
- Wattage
- 1.44 kW
- Capacity
- 6.5 Gallons
- Voltage
- 120V
- Temperature Control
- 50°F to 149°F
- Certification
- UL Listed
View on Amazon: Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank Affiliate link
This Thermomate unit is a 6.5-gallon electric mini tank designed for under-sink point-of-use installation. It operates on 120V power with a 1.44 kW heating element. The glass-lined tank offers 99% thermal efficiency and adjustable temperatures from 50°F to 149°F. Its compact 17.7-inch square footprint fits tight spaces. This heater suits small households needing instant hot water for a single sink without waiting for central system recovery.
Pros
- 6.5-gallon capacity provides instant hot water for point-of-use applications
- 99% thermal efficiency reduces standby energy loss
- Adjustable thermostat allows temperature settings between 50°F and 149°F
- Compact 17.7 x 17.7 x 14.6 inch design fits under sinks
- UL Listed for safety with glass-lined tank durability
Cons
- Limited to 120V electrical connection requiring a standard outlet
- Small 6.5-gallon capacity insufficient for whole-house heating
- Heavier 26.5 lb build may require sturdy mounting support
Good fit if
- You need hot water for a single bathroom or kitchen sink
- You have a standard 120V outlet near the installation spot
- You want to reduce wait time for hot water at one faucet
Skip if
- You require heating water for multiple fixtures simultaneously
- You only have 240V electrical circuits available
- You need a high-flow solution for showers or bathtubs
Verdict: Thermomate 6.5 Gallon Electric Mini Tank delivers reliable point-of-use hot water for single sinks. It fits buyers who prioritize quick recovery and compact under-sink installation over whole-home capacity.
MIZUDO 8-Gallon 120V Mini-Tank Water Heater
Best for: under-sink hot water needs
- Fuel Type
- Electric
- Wattage
- 1440 W
- Capacity
- 8.0 gal
- Voltage
- 120 V
- Temperature Control
- 55–145°F
- Certification
- CSA
View on Amazon: MIZUDO 8-Gallon 120V Mini-Tank Water Heater Affiliate link
This MIZUDO 8-gallon electric mini tank is built for under-sink use. It features a 1440W heating element and a 120V plug-in design. The unit measures 17.32 by 20.8 by 15.35 inches, fitting tight spaces. You get adjustable temperature control from 55°F to 145°F. CSA certification ensures safety with overheat protection. It suits small households or RVs needing localized hot water.
Pros
- 1440W L-shaped stainless steel heating rod for rapid recovery
- Compact dimensions fit under sinks and in cabinets
- Adjustable thermostat ranges from 55°F to 145°F
- CSA certified with high-temp limit shut-off at 167°F
Cons
- 8-gallon capacity limits simultaneous use
- Requires a dedicated 15A breaker for 120V operation
- Heavier build at 27 pounds
Good fit if
- You need hot water for a single sink or dishwasher
- You have a 120V outlet near the installation spot
- You are outfitting an RV or food truck
Skip if
- You require high-volume hot water for multiple fixtures
- You only have a 10A circuit available
- You need a unit larger than 8 gallons
Verdict: MIZUDO 8 Gallon Electric Mini Tank delivers reliable, localized hot water for small spaces. It fits buyers who prioritize compact design and easy plug-in installation over high capacity.
Specifications side by side
| Spec | Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank | MIZUDO 8-Gallon 120V Mini-Tank Water Heater |
|---|---|---|
| Fuel Type | Electric | Electric |
| Wattage | 1.44 kW | 1440 W |
| Capacity | 6.5 Gallons | 8.0 gal |
| Voltage | 120V | 120 V |
| Temperature Control | 50°F to 149°F | 55–145°F |
| Certification | UL Listed | CSA |
| Dimensions | 17.7"H x 17.7"W x 14.6"D | 20.8 x 17.3 x 17.3 in |
| Use | Under Sink | Camping, RV, Under Sink |
| Weight | 26.5 pounds | 27 pounds |
| Size | 6.5 Gallon | not stated |
| Color | white,blue | 8 Gal |
| Model | ES700 | Etech 80 | 8.0 Gallon |
Frequently asked questions
Are Thermomate and MIZUDO true tankless heaters?
No, both brands offer mini-tank models in this comparison. The Thermomate is a 6.5-gallon electric unit, and the MIZUDO is an 8-gallon electric unit. These are storage heaters, not tankless systems. They store hot water for immediate point-of-use needs rather than heating water on demand without a tank.
Which mini-tank has a larger capacity?
The MIZUDO model holds 8.0 gallons of water. The Thermomate unit stores 6.5 gallons. If you need more stored hot water for tasks like handwashing or dish rinsing, the MIZUDO provides a larger volume. This extra capacity helps support continuous use in small spaces without immediate reheat delays.
Do these units require special electrical wiring?
Both heaters operate on standard 120V power. You can plug them into standard outlets, making installation straightforward for under-sink setups. They do not require high-voltage circuits or dedicated 240V lines. This makes them suitable for renters or homeowners who want easy integration into existing residential electrical systems.
How do the dimensions compare for under-sink fit?
The Thermomate measures 14.6 inches wide, 17.7 inches long, and 21.2 inches high. The MIZUDO is 17.3 inches wide, 17.3 inches long, and 20.8 inches high. Check your cabinet space carefully. The Thermomate is slightly taller but narrower, while the MIZUDO is wider but slightly shorter.
Which unit weighs less for easier handling?
The Thermomate weighs 26.5 pounds. The MIZUDO weighs 27 pounds. The difference is minimal, but the Thermomate is slightly lighter. Both are compact electric mini-tanks designed for under-sink placement. Their weight is manageable for standard residential installation without requiring heavy-duty support structures.
What is the primary use case for these heaters?
Both units are designed for single-sink point-of-use hot water. They provide localized heating for tasks like handwashing, brushing teeth, or light dish rinsing. They are not intended for whole-home hot water supply. You should install one near the fixture that needs immediate hot water access.