Looking Beyond the Thermomate 14kW Electric Tankless Water Heater? 6 Alternatives Worth a Look
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The ThermoMate 14kW Electric Tankless Water Heater delivers reliable hot water for small homes with adequate electrical capacity. If you are considering thermomate 14kw electric tankless water heater alternatives, you likely need different flow rates or smart features. This unit provides up to 3.4 GPM and fits in tight spaces, but it requires a 60 Amp circuit. Some buyers want higher flow for whole-house use or app control for convenience. Others prefer brands with different safety certifications or manual controls. We selected these options because their specifications overlap with the original model. Each alternative shares key traits like 240V electric operation or similar wattage. You can compare flow rates, dimensions, and voltage requirements directly. This list helps you find a heater that matches your specific electrical setup and hot water demands. The following 6 products offer distinct advantages depending on your needs.
How the alternatives differ from ThermoMate
Westinghouse 14kW Electric 240V
The Westinghouse 14kW model shares the same 14 kW wattage and 240V requirement as the ThermoMate. It offers a more compact footprint at 8 by 11 inches, saving space compared to the ThermoMate’s 15.9 by 11.2 inch dimensions. This unit targets smart home users by adding app control, which the ThermoMate lacks. You get similar heating power in a smaller box. However, you give up the ThermoMate’s specific cast aluminum heating element and its broad temperature modulation range. Choose this if you prioritize digital integration and a tighter installation profile over the ThermoMate’s robust internal construction.
NOVIEEX 18 kW 4.9 GPM Tankless Water Heater
The NOVIEEX 18kW unit steps up to 18 kW power, delivering a higher flow rate of 4.9 GPM compared to the ThermoMate’s 3.4 GPM. This makes it suitable for homes needing more simultaneous hot water. It uses a manual temperature control interface, whereas the ThermoMate features a digital touch screen. The NOVIEEX is larger and heavier, measuring 15.9 by 11.1 inches. You gain significant flow capacity but lose smart modulation and precise digital temperature stability. Select this alternative if your electrical panel supports the extra load and you value raw output over advanced temperature precision.
Electrolux 14 kW Wi-Fi Tankless Water Heater
The Electrolux 14kW heater matches the ThermoMate’s 14 kW wattage and 240V electrical needs. It distinguishes itself with built-in Wi-Fi connectivity for remote monitoring, a feature absent in the ThermoMate. The Electrolux unit is also lighter at 7.8 pounds and has a pearl white finish, contrasting with the ThermoMate’s gray color. It includes scale protection technology to extend lifespan. You trade the ThermoMate’s heavy-duty cast aluminum block for this smart connectivity and maintenance aid. Pick this model if you want remote management and scale prevention in a compact, lightweight package.
VancEpic 14kW Electric Tankless Water Heater
The VancEpic 14kW model matches the ThermoMate’s 14 kW power and 240V requirement. It offers a significantly narrower profile at 3.19 inches wide, making it ideal for tight spaces where the ThermoMate’s 11.2-inch width might not fit. It weighs less at 10.5 pounds. This unit focuses on safety and efficiency for whole-house use. You give up the ThermoMate’s digital touch controls and advanced modulation chip for a simpler, space-saving design. Choose the VancEpic if your installation area has strict width constraints and you need a reliable, compact solution for moderate hot water demands.
Thermomate 18kW Electric Tankless Water Heater
The Thermomate 18kW version increases power from 14 kW to 18 kW, boosting flow capacity for whole-house applications. It shares the same brand and gray color but is larger at 17.1 by 13.1 inches. This model suits homes with robust electrical infrastructure that can handle the higher amperage. You gain greater hot water output for multiple fixtures but require more installation space and a stronger electrical panel. It lacks the specific smart modulation features of the 14kW ThermoMate. Opt for this if you need higher volume hot water and have the electrical capacity to support the increased wattage.
Ranein 18kW 4.3 GPM Electric Water Heater
The Ranein 18kW heater provides 4.3 GPM of flow, exceeding the ThermoMate’s 3.4 GPM. It uses 18 kW of power on a 240V circuit, requiring more electrical capacity than the 14kW ThermoMate. The unit is larger and heavier, measuring 18.7 by 13.8 inches. It is designed for whole-house use with simultaneous fixture operation. You trade the ThermoMate’s compact size and digital controls for higher flow rates and manual operation. This alternative fits households with strong electrical panels that prioritize maximum hot water volume over space efficiency or smart temperature modulation features.
Quick picks
Our 7 picks
ThermoMate 14kW Electric Tankless Water Heater
Best for: small homes with 150 Amp panels
- Fuel Type
- Electric
- Flow Rate
- 3.4 GPM
- Wattage
- 14 kW
- Installation Location
- Indoor
- Voltage
- 240 V
- Temperature Control
- 86°F to 131°F
View on Amazon: ThermoMate 14kW Electric Tankless Water Heater Affiliate link
The Thermomate 14kW delivers up to 3.4 GPM of hot water at 240V. Its compact 15.9 x 11.2 x 3-inch frame saves space. The cast aluminum heating element resists scale. Smart modulation keeps temperatures stable between 86°F and 131°F. This unit suits homes with 150 Amp panels. It fits small apartments or cabins well. You get endless hot water for one or two fixtures.
Pros
- High 3.4 GPM flow rate at 240V
- Compact 15.9 x 11.2 x 3-inch size
- Cast aluminum heating element resists corrosion
- Smart modulation for stable 86°F to 131°F output
- ETL listed for safety
Cons
- Requires a dedicated 60 Amp circuit breaker
- Needs 150 Amp total panel capacity
- Indoor installation only
Good fit if
- You have a 150 Amp electrical panel
- You need hot water for one or two fixtures
- You want a compact wall-mounted unit
Skip if
- You cannot install a 60 Amp breaker
- You need outdoor installation capability
- You require more than 3.4 GPM flow
Verdict: Thermomate 14kW Electric Tankless Water Heater fits small homes needing reliable hot water for limited fixtures. It works best where electrical capacity allows a 60 Amp circuit.
Westinghouse 14kW Electric 240V
Best for: Smart home users needing compact 14kW heating
- Fuel Type
- Electric
- Flow Rate
- 3.38 GPM
- Wattage
- 14kw
- Voltage
- 240V
- Temperature Control
- 86-140℉
- Certification
- ETL
View on Amazon: Westinghouse 14kW Electric 240V Affiliate link
This Westinghouse unit delivers 14 kW of power at 240 volts, providing a maximum flow rate of 3.38 GPM. It includes smart Wi-Fi control for remote temperature adjustments and voice commands via Alexa or Google Home. The device measures 14.2 inches high and features ETL certification for safety. It is designed for whole-house use, allowing simultaneous shower and sink operation without running out of hot water.
Pros
- 14 kW heating power for instant hot water
- Smart Wi-Fi and voice control support
- ETL certified with 4-layer safety protection
- Compact 14.2-inch height for wall mounting
Cons
- 3.38 GPM flow rate is lower than 4.3 GPM competitors
- Requires a dedicated 60-amp circuit breaker
- Minimum start-up flow of 0.5 GPM may limit low-flow fixtures
Good fit if
- You want smart app and voice control for your water heater
- You need a compact unit that fits tight utility spaces
- You require ETL safety certification for peace of mind
Skip if
- You need a flow rate above 4.0 GPM for multiple bathrooms
- You cannot install a 60-amp double-pole circuit breaker
- You prefer a unit without Wi-Fi connectivity
Verdict: Westinghouse 14kW Electric Tankless Water Heater suits users who prioritize smart home integration and compact design over maximum flow capacity. It is a solid choice for single-bathroom setups where app control is a key requirement.
NOVIEEX 18 kW 4.9 GPM Tankless Water Heater
Best for: High-flow needs in homes with strong electrical setups
- Fuel Type
- Electric
- Flow Rate
- 4.9 GPM
- Wattage
- 18kW
- Installation Location
- Indoor
- Voltage
- 240V
- Temperature Control
- 77°F to 140°F, 1°F increments
View on Amazon: NOVIEEX 18 kW 4.9 GPM Tankless Water Heater Affiliate link
The NOVIEEX 18kW unit delivers up to 4.9 GPM at 240V, making it suitable for small to medium homes. It features an ultra-thin design measuring 15.86 inches high and 3.18 inches deep. The LED display allows precise temperature adjustments from 77°F to 140°F in 1°F steps. This electric heater offers 99.8% thermal efficiency and includes an 8-layer safety system with dry-combustion prevention and leakage protection.
Pros
- High flow rate of 4.9 GPM for multiple fixtures
- Precise 1°F temperature increments on LED screen
- Ultra-thin 3.18-inch depth saves wall space
- 99.8% thermal efficiency reduces standby energy waste
- 8-layer safety system including IPX4 waterproofing
Cons
- Requires 2x 40A circuit breakers and 8 AWG wiring
- Indoor installation only
- No Wi-Fi connectivity for remote control
Good fit if
- You need a high-flow heater for 2-3 simultaneous uses
- You have the electrical capacity for dual 40A circuits
- You prefer precise manual temperature control over app management
Skip if
- You require outdoor installation capabilities
- You only have a single 40A electrical circuit available
- You want smart home integration or remote monitoring
Verdict: The NOVIEEX 18kW Electric Tankless Heater suits buyers who prioritize maximum flow rate and precise manual temperature control. It is ideal for homes with robust electrical infrastructure that need high-volume hot water without smart features.
Electrolux 14 kW Wi-Fi Tankless Water Heater
Best for: Smart home users with 150A panels
- Fuel Type
- Electric
- Flow Rate
- 3.4 GPM
- Wattage
- 14 kW
- Voltage
- 240V
- Temperature Control
- 80°F–140°F, ±1°F
- Certification
- ETL
View on Amazon: Electrolux 14 kW Wi-Fi Tankless Water Heater Affiliate link
The Electrolux 14kW electric tankless water heater delivers up to 3.4 GPM at 240V. It features built-in WiFi for app control and Alexa compatibility, allowing remote temperature adjustments from 80°F to 140°F. The unit includes a scale inhibitor to reduce maintenance and claims a double lifespan. Its compact dimensions of 8.9 x 12.8 x 3.3 inches save space. This model suits users wanting smart home integration and consistent hot water for one to two fixtures.
Pros
- Built-in WiFi and Alexa voice control
- Scale inhibitor reduces limescale buildup
- Compact 8.9 x 12.8 x 3.3 inch design
- ETL certified for safety
Cons
- Requires a 60A two-pole breaker
- Needs 150 Amp total panel capacity
- Only 1-year whole-unit warranty
Good fit if
- You want remote temperature control via app
- You have a 150 Amp electrical panel
- You need a compact unit for tight spaces
Skip if
- You cannot install a 60A breaker
- You need more than 3.4 GPM flow
- You prefer a longer warranty period
Verdict: Electrolux 14kW WiFi Electric Heater fits homes with strong electrical panels that value smart connectivity and scale protection over raw flow rate.
VancEpic 14kW Electric Tankless Water Heater
Best for: Compact spaces with moderate hot water needs
- Fuel Type
- Electric
- Wattage
- 14 kW
- Voltage
- 240V
- Dimensions
- 15.9 x 3.19 x 3.19 inches
- Use
- Whole House
- Weight
- 10.5 pounds
View on Amazon: VancEpic 14kW Electric Tankless Water Heater Affiliate link
The VancEpic 14kW unit delivers instant hot water using 240V power. Its compact 15.9 x 3.19 x 3.19 inch design fits tight spaces like under sinks. Smart self-modulating inverter technology adjusts power to flow, saving energy. It includes an inlet filter and multiple safety protections. This whole-house heater suits homes with moderate hot water needs.
Pros
- Compact 15.9 x 3.19 x 3.19 inch dimensions
- Smart self-modulating inverter technology for energy savings
- Built-in inlet filter protects internal components
- Multiple safety protections including overheat and leakage prevention
Cons
- 14kW output is lower than 18kW alternatives on this list
- No Wi-Fi or smart home connectivity listed
- Requires professional installation for 240V wiring
Good fit if
- You need a compact unit for tight spaces
- You want energy-saving inverter technology
- You prefer a whole-house electric heater
Skip if
- You require high flow rates for multiple bathrooms
- You want smart home integration
- You cannot install 240V wiring
Verdict: VancEpic 14kW Electric Tankless Water Heater fits homes with moderate hot water demands and limited installation space. It offers reliable safety features and energy efficiency for single-bathroom or small household use.
Thermomate 18kW Electric Tankless Water Heater
Best for: Whole-house hot water with high electrical capacity
- Fuel Type
- Electric
- Flow Rate
- Up to 4.4GMP
- Wattage
- 18kW
- Installation Location
- Indoor
- Voltage
- 240V
- Temperature Control
- 80°F to 140°F, ±1°F
View on Amazon: Thermomate 18kW Electric Tankless Water Heater Affiliate link
This 18kW electric unit delivers up to 4.4 GPM at 240V, making it a strong option for whole-house needs. It features self-modulating technology for 99.8% efficiency and digital controls adjustable in 1°F increments from 80°F to 140°F. The compact 17.1-inch height fits tight spaces. You need two 40-amp double-pole breakers and 8AWG wire for installation. It is ETL certified for safety.
Pros
- High 18kW output provides up to 4.4 GPM flow rate
- Digital display allows precise 1°F temperature adjustments
- Self-modulating technology ensures 99.8% energy efficiency
- ETL certified with overheating and leakage protection
Cons
- Requires two 40-amp double-pole breakers, demanding significant electrical capacity
- Uses 8AWG wire, which is thicker and harder to route than standard options
- Indoor installation only, limiting placement flexibility
Good fit if
- You have the electrical capacity for dual 40-amp breakers
- You need a high-flow unit for whole-house use
- You want precise digital temperature control
Skip if
- You only have a single 40-amp circuit available
- You need outdoor installation capability
- You prefer simpler wiring with smaller gauge cables
Verdict: Thermomate 18kW Electric Tankless Water Heater suits homes with robust electrical infrastructure that need high flow rates. It is ideal for users prioritizing efficiency and precise temperature settings over easy wiring.
Ranein 18kW 4.3 GPM Electric Water Heater
Best for: High flow whole-house needs
- Fuel Type
- Electric
- Flow Rate
- 4.3 GPM
- Wattage
- 18 kW
- Voltage
- 240 V
- Temperature Control
- 86°F to 131°F, 1°F increments
- Certification
- CSA
View on Amazon: Ranein 18kW 4.3 GPM Electric Water Heater Affiliate link
The Ranein 18kW unit delivers a maximum flow rate of 4.3 GPM at 240V. It features 99% thermal efficiency and precise temperature control from 86°F to 131°F in 1°F increments. This whole-house heater supports two to three outlets simultaneously. Its compact design saves space, and it holds CSA certification for safety. You get near-instant hot water with stainless steel heating elements.
Pros
- High 4.3 GPM maximum flow rate
- 99% thermal efficiency rating
- Precise 1°F temperature adjustment increments
- CSA safety certification
Cons
- Requires two dedicated 40A double-pole breakers
- Needs two 8 AWG cables for installation
- Heavier at 17.4 pounds than smaller models
Good fit if
- You need high flow for multiple outlets
- You have 240V electrical capacity available
- You want precise temperature control
Skip if
- You only have a single 40A circuit
- You cannot run two 8 AWG cables
- You prefer a lighter unit under 15 lbs
Verdict: Ranein 18kW Electric Tankless Heater suits households needing high flow for simultaneous use. It fits users with the necessary electrical infrastructure for dual circuits.
Specifications side by side
| Spec | ThermoMate 14kW Electric Tankless Water Heater | Westinghouse 14kW Electric 240V | NOVIEEX 18 kW 4.9 GPM Tankless Water Heater | Electrolux 14 kW Wi-Fi Tankless Water Heater | VancEpic 14kW Electric Tankless Water Heater | Thermomate 18kW Electric Tankless Water Heater | Ranein 18kW 4.3 GPM Electric Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | 3.4 GPM | 3.38 GPM | 4.9 GPM | 3.4 GPM | not stated | Up to 4.4GMP | 4.3 GPM |
| Wattage | 14 kW | 14kw | 18kW | 14 kW | 14 kW | 18kW | 18 kW |
| Installation Location | Indoor | not stated | Indoor | not stated | not stated | Indoor | not stated |
| Voltage | 240 V | 240V | 240V | 240V | 240V | 240V | 240 V |
| Temperature Control | 86°F to 131°F | 86-140℉ | 77°F to 140°F, 1°F increments | 80°F–140°F, ±1°F | not stated | 80°F to 140°F, ±1°F | 86°F to 131°F, 1°F increments |
| Certification | ETL | ETL | not stated | ETL | not stated | ETL | CSA |
| Dimensions | 15.9" x 11.2" x 3" | 14.2" H x 9.5" W x 3.5" D | 15.86" H x 11.14" W x 3.18" D | 12.8 x 8.9 x 3.3 inches | 15.9 x 3.19 x 3.19 inches | 17.12" x 13.12" x 3.12" | not stated |
| Use | not stated | not stated | not stated | not stated | Whole House | not stated | Whole House |
| Features | not stated | WiFi | not stated | WiFi | not stated | not stated | not stated |
| Weight | 13 pounds | not stated | not stated | 7.8 pounds | 10.5 pounds | not stated | 17.4 pounds |
| Color | Gray | not stated | Silver | Pearl White | Gray | Gray | Gray |
| Model | EH140 | HEU-ET014KA1G-A2 | DS-18 | 14kW | RE14K-C | ET180 | RE18K |
| Size | not stated | S-14 | not stated | E-14 kW | not stated | 240V/18kW | not stated |
If you need a different flow rate, compare specs among the best electric tankless water heaters.
Frequently asked questions
Which tankless water heater has the highest flow rate in this list?
The NOVIEEX 18 kW model offers the highest flow rate at 4.9 GPM. It is designed for homes with strong electrical setups that need high-volume hot water. This unit prioritizes maximum flow and precise manual temperature control over smart connectivity features.
Are there smart home compatible tankless water heaters available?
Yes, both the Westinghouse 14kW and Electrolux 14kW models support smart home integration. The Westinghouse unit includes app control for compact 14kW heating needs. The Electrolux model adds WiFi connectivity and scale protection for users with 150A electrical panels.
Which model is the most compact for tight spaces?
The VancEpic 14kW Electric Tankless Water Heater is the most compact option. It measures only 3.19 inches in width and length, making it ideal for limited installation space. This unit weighs 10.5 pounds and suits single-bathroom or small household use.
What is the difference between the 14kW and 18kW units?
The primary difference is power output and flow capacity. The 18kW models, such as the NOVIEEX and Ranein, provide higher flow rates up to 4.9 GPM. The 14kW units, like the ThermoMate and Westinghouse, offer 3.4 GPM and are better for smaller electrical loads.
Do any of these heaters require a specific electrical panel size?
Yes, electrical capacity is critical for these electric units. The ThermoMate 14kW fits small homes with 150 Amp panels. The Electrolux 14kW also suits homes with strong 150A panels. Higher wattage models like the 18kW require robust electrical infrastructure for dual circuits.
Which tankless heater is best for whole-house use?
The Ranein 18kW is labeled as the best for high-flow whole-house needs. It delivers 4.3 GPM for simultaneous use. The Thermomate 18kW is also suitable for whole-house hot water, prioritizing efficiency and precise temperature settings for homes with high electrical capacity.
How do the dimensions of these heaters compare?
Dimensions vary significantly across the list. The VancEpic is very narrow at 3.19 inches wide. The Westinghouse is compact at 8 by 11 inches. Larger models like the Thermomate 18kW measure 13.1 by 17.1 inches, requiring more wall space for installation.