Best Thermomate 11 kW Tankless Water Heaters in 2026: 2 Picks
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Finding the best thermomate 11 kW tankless water heaters requires checking exact specs. We compared 2 models using only published listing data. The top pick is the Thermomate 11 kW Electric Tankless Water Heater. It leads because its compact 7.09-inch width fits tight installations better than other units. These picks are based strictly on the specifications published on the listings. Use this guide to decide which unit matches your space and electrical needs.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Thermomate 11 kW Electric Tankless Water Heater Best overall | point-of-use bathroom and sink applications | Check price of Thermomate 11 kW Electric Tankless Water Heater on Amazon |
| 2 | Thermomate 11kW Electric Tankless Water Heater Best budget | Single bathroom or small sink point-of-use | Check price of Thermomate 11kW Electric Tankless Water Heater on Amazon |
The best fit for you
- You need the most compact unit for tight spaces Thermomate 11 kW Electric Tankless Water Heater Its 11-pound weight and 7.09-inch width fit small installations.
- You want precise temperature control for a single bathroom Thermomate 11kW Electric Tankless Water Heater This model offers stable hot water for low-flow fixtures.
- You prefer a 240V electric heater for point-of-use Thermomate 11 kW Electric Tankless Water Heater It runs on 240V power with 11 kW output.
Our 2 picks
Thermomate 11 kW Electric Tankless Water Heater
Best for: point-of-use bathroom and sink applications
- Wattage
- 11 kW (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 2.15 GPM
- Voltage
- 240 V
- Certification
- ETL
- Dimensions
- 10.6 x 7.09 x 7.09 inches
View on Amazon: Thermomate 11 kW Electric Tankless Water Heater Affiliate link
This ThermoMate unit delivers instant hot water with an 11 kW heating element powered by 240 volts. It supports a flow rate of 2.15 GPM at a 35°F temperature rise, reaching a maximum temperature of 131°F. The compact design measures 10.6 inches high and weighs 11 pounds, making it suitable for tight spaces. It features an ETL-certified cast aluminum heating chamber for durability and includes safety protections against overheating.
Pros
- 11 kW power supports up to 3 faucets
- 2.15 GPM flow rate at 35°F rise
- Compact 10.6"H x 7.09"L x 7.09"W size
- ETL certified with overheating protection
Cons
- Requires a 50 Amp double-pole breaker
- Max temperature limited to 131°F
- Heavy 11-pound build requires sturdy mounting
Good fit if
- You need hot water for a bathroom or sink
- You have a 240-volt electrical circuit available
- You want a compact unit for tight spaces
Skip if
- You require a temperature above 131°F
- You only have a 40 Amp breaker available
- You need a unit for multiple simultaneous showers
Verdict: ThermoMate 11kW Electric Tankless Heater fits households needing reliable point-of-use hot water for sinks or bathrooms. Its compact size and high efficiency make it ideal for tight installations where space is limited.
Thermomate 11kW Electric Tankless Water Heater
Best for: Single bathroom or small sink point-of-use
- Wattage
- 11 kW (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- Up to 2.6GPM
- Voltage
- 208~240 Volt
- Temperature Control
- Within 1°F
- Certification
- ETL Certified
View on Amazon: Thermomate 11kW Electric Tankless Water Heater Affiliate link
This ThermoMate unit delivers 11 kW of electric power at 208 to 240 volts. It provides a flow rate of 2.15 GPM for a 35°F temperature rise. The device maintains water temperature within 1°F of your setting. Its compact dimensions of 11.8 by 3.13 by 14.8 inches allow for wall mounting. It suits small sinks or point-of-use applications where consistent hot water is needed without a storage tank.
Pros
- 11 kW electric heating element for on-demand hot water
- Temperature control within 1°F of selected setting
- Compact size of 11.8 inches wide and 3.13 inches high
- ETL certified with overheating and leakage protection
Cons
- Requires a 60 Amp breaker setup
- Limited to 2.15 GPM flow rate at 35°F rise
- Heavy alloy metal housing may add installation weight
Good fit if
- You need hot water for a single bathroom or small sink
- You have the electrical capacity for a 60 Amp circuit
- You want precise temperature stability within 1°F
Skip if
- You require a flow rate higher than 2.15 GPM
- You cannot install a 60 Amp double-pole breaker
- You need a unit smaller than 3.13 inches in height
Verdict: ThermoMate 11kW Electric Tankless Heater offers precise temperature control and compact design for low-flow applications. It fits users with adequate electrical infrastructure who prioritize stable hot water for single fixtures.
Specifications side by side
| Spec | Thermomate 11 kW Electric Tankless Water Heater | Thermomate 11kW Electric Tankless Water Heater |
|---|---|---|
| Fuel Type | Electric | Electric |
| Flow Rate | 2.15 GPM | Up to 2.6GPM |
| Wattage | 11 kW | 11kW |
| Voltage | 240 V | 208~240 Volt |
| Temperature Control | not stated | Within 1°F |
| Certification | ETL | ETL Certified |
| Dimensions | 10.6 x 7.09 x 7.09 inches | not stated |
| Weight | 11 pounds | not stated |
| Color | Gray | Gray |
| Model | ET Mini | ET110 |
| Size | not stated | 240V/11kW |
How to choose the right one
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Match flow to wattage
An 11 kW unit delivers hot water for low-flow fixtures. You should expect reliable performance for a single bathroom sink or shower. Higher flow rates may reduce temperature rise. Verify your expected usage matches this capacity. The first pick is rated for point-of-use bathroom applications. Ensure your plumbing demand stays within these limits for consistent results.
-
Verify electrical capacity
Both models require a dedicated 240V circuit. You must confirm your home provides this voltage. Check your breaker panel for available amperage. An insufficient circuit can cause tripping or failure. These units do not work on standard 120V outlets. Consult a licensed electrician to install the correct wiring. Proper electrical setup ensures safe and efficient operation of the heater.
-
Check physical dimensions
Size matters for tight installations. The top pick measures 7.09 inches wide. It weighs only 11 pounds. This compact form fits small cabinets. The second model is wider at 11.8 inches. Measure your available space before purchasing. Ensure you have clearance for connections. The narrower unit offers more flexibility for confined areas in your home.
-
Identify usage location
These heaters are designed for point-of-use. They work well for sinks and small bathrooms. They are not intended for whole-house supply. Place the unit close to the fixture. This reduces heat loss in pipes. The first model suits general bathroom needs. The second is ideal for single fixtures. Match the unit to your specific water demand zone.
-
Confirm fuel type
Both options are electric tankless heaters. You do not need gas lines or venting. This simplifies installation significantly. Electric units are safe for indoor use. They do not produce combustion gases. Verify you have the necessary electrical infrastructure. Gas models require different venting and fuel sources. These electric units offer a straightforward upgrade path for existing homes.
Frequently asked questions
Can the Thermomate 11 kW heat water for a full bathroom shower?
Yes, but it is best suited for low-flow applications. The 11 kW output provides stable hot water for a single bathroom or sink. It works well for point-of-use installations where space is limited. You should expect reliable performance for one fixture at a time rather than multiple simultaneous uses.
What voltage does the Thermomate 11 kW unit require?
It requires a 240V electrical circuit. Both models in this guide operate on 240V power. You must verify your home has the necessary voltage and amperage before installation. The unit is electric and does not use gas or other fuel types for heating water.
How wide is the most compact Thermomate 11 kW model?
The top-ranked model measures 7.09 inches in width. This compact size fits tight installations better than wider units. It also weighs only 11 pounds, making it easy to mount in small spaces. This makes it ideal for point-of-use bathroom and sink applications.
Is the Thermomate 11 kW suitable for whole-house heating?
No, it is designed for point-of-use applications. The 11 kW wattage is sufficient for low-flow fixtures like a single sink or shower. It is not intended to heat water for an entire house. You should use it for specific locations where space is limited.
What is the difference between the two Thermomate 11 kW models?
The main difference is physical size. The top pick is narrower at 7.09 inches wide, while the second model is wider at 11.8 inches. Both share the same 240V voltage and 11 kW wattage. Choose the narrower unit if you have tight space constraints.
Does the Thermomate 11 kW have precise temperature control?
Yes, it offers precise temperature control for stable hot water. This feature is particularly useful for low-flow applications. You can rely on consistent heating for single fixtures. The electric design allows for accurate regulation of water temperature during use.