Looking Beyond the Eemax EX190TC 3-Gallon Series Two? 6 Alternatives Worth a Look
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If you are searching for eemax ex190tc 3 gallon series two alternatives, you likely value compact design and high efficiency. The Eemax EX190TC delivers 99% energy efficiency and precise thermostatic control in a tiny 3-inch footprint. It saves space and provides on-demand hot water for single-fixture needs. However, its 2 GPM flow rate limits simultaneous use. You might need higher capacity or different dimensions.
We selected 6 alternatives because their specifications overlap with the original unit. These electric tankless water heaters share whole-house applications and electric fuel types. Some offer greater wattage for higher flow rates. Others provide WiFi connectivity or different physical sizes. You can compare flow rates, voltage requirements, and dimensions to find a better fit. This guide helps you choose based on published specs rather than marketing claims. Focus on the data that matters for your home's electrical infrastructure and hot water demands.
Our top pick: Eemax Series Two Whole House Tankless Water Heater.
How Alternatives Compare to Eemax
Rheem 18kW 240V Electric Tankless Water Heater
The Rheem RTEX-18 swaps the Eemax’s 3-inch depth for a 14.5-inch width, offering a larger footprint for better heat dissipation. It delivers 18 kW of power, significantly more than the Eemax’s implied lower output, allowing for higher flow rates. While the Eemax excels in tight spaces, the Rheem provides more robust temperature stability for whole-house use. You gain durability and precision but lose the ultra-compact form factor. This unit suits those who can spare wall space for improved performance and precise thermostatic control.
Ranein 18kW 4.3 GPM Electric Water Heater
The Ranein RE18K offers a 4.3 GPM flow rate, vastly outperforming the Eemax’s 2 GPM limit. It uses 18 kW of power to handle whole-house demands that the Eemax cannot support simultaneously. The unit is larger, measuring 18.7 inches in height, and requires dual 40A circuits. You trade the Eemax’s space-saving design for substantial capacity and precise temperature control. This alternative is ideal for homes needing reliable hot water for multiple fixtures, provided your electrical infrastructure can handle the higher amperage requirements.
SIVUATEK 27kW Electric Tankless Water Heater
The SIVUATEK TSB-270 steps up to 27 kW, providing raw heating power for high-demand households. It lacks the Eemax’s tiny 3-inch profile, measuring 17.3 inches tall. This unit prioritizes volume and manual control over compactness. You get robust performance for large families but sacrifice the space efficiency that defines the Eemax. It is best for users with strong electrical setups who need continuous hot water. The trade-off is clear: you gain capacity and power while accepting a larger physical size and more complex installation requirements.
Orbek 18kW 240V Tankless Electric Water Heater
The Orbek HEU-ET018A5W-M0 offers an 18 kW output in a compact 8x8 inch footprint, which is wider than the Eemax but shallower. It provides ETL certification for added safety assurance. This unit supports two to three simultaneous hot water points, exceeding the Eemax’s single-fixture focus. You gain versatility and safety certification but lose the ultra-thin 3-inch depth. It is a practical choice for homeowners needing basic smart-free reliability. The trade-off involves a slightly larger width for improved capacity and certified safety features.
Westinghouse 24kW WiFi Tankless Water Heater
The Westinghouse WET-24K-G introduces WiFi connectivity, allowing remote control via an app. It delivers 24 kW of power, significantly higher than the Eemax’s capacity. The unit measures 17.1 inches tall, requiring more vertical space. You gain smart features and high flow rates but sacrifice the Eemax’s compact 3-inch depth. This model suits tech-savvy users with 100A electrical capacity who want remote management. The primary difference is the addition of digital control and higher power output, traded for a larger physical presence and complex wiring needs.
NOVIEEX 27kW 7.4 GPM Electric Tankless Water Heater
The NOVIEEX DS-18 offers 27 kW of power and a 7.4 GPM flow rate, far exceeding the Eemax’s 2 GPM. It is designed for indoor installation in large homes with strong electrical systems. The unit measures 15.9 inches tall, taking up more space than the Eemax. You gain high capacity for multiple simultaneous uses but lose the space-saving design. This alternative is for users prioritizing volume and power over compactness. The trade-off involves accepting a larger footprint and demanding electrical requirements for superior hot water performance.
Quick picks
Our 7 picks
Eemax Series Two Whole House Tankless Water Heater
Best for: Single-fixture space-constrained installations
- Fuel Type
- Electric
- Flow Rate
- 2 GPM
- Capacity
- 3 gallons
- Temperature Control
- Thermostatic control
- Dimensions
- 10.50 x 3.00 x 10.00 inches
- Use
- Whole House
View on Amazon: Eemax Series Two Whole House Tankless Water Heater Affiliate link
The Eemax EX190TC is a 3-gallon whole house electric tankless water heater. It delivers 2 GPM with 99% energy efficiency. Its compact 10.5 x 3 x 10 inch design saves space. Thermostatic control ensures precise outlet temperatures. This unit fits well for single-fixture use or small households needing on-demand hot water without running out.
Pros
- 99% energy efficient operation
- Compact 3-inch width saves space
- Thermostatic control for precise temperature
- 3/4 inch NPT bottom connections
Cons
- 2 GPM flow rate limits simultaneous use
- 3-gallon capacity is small for whole house
- No smart or WiFi connectivity listed
Good fit if
- You need hot water for one fixture at a time
- You have limited installation space
- You want high energy efficiency
Skip if
- You need hot water for multiple showers at once
- You require smart home integration
- You need a flow rate above 2 GPM
Verdict: Eemax EX190TC Compact Electric Heater is ideal for users prioritizing space savings and efficiency over high volume. It serves single-fixture needs well but cannot support whole-house simultaneous demand.
Rheem 18kW 240V Electric Tankless Water Heater
Best for: Precise temperature control in compact spaces
- Fuel Type
- Electric
- Flow Rate
- 4.4 GPM
- Wattage
- 18 kW
- Voltage
- 240 V
- Temperature Control
- ±1°F
- Dimensions
- 3.5 x 14.5 x 18.5 inches
View on Amazon: Rheem 18kW 240V Electric Tankless Water Heater Affiliate link
The Rheem 18kW delivers up to 4.4 GPM of hot water at 240V. It features copper immersion elements and a digital display with ±1°F accuracy. This compact unit measures 3.5 x 14.5 x 18.5 inches and weighs 14.8 pounds. It suits whole-house needs where precise temperature control matters. The self-modulating technology adjusts power to meet demand efficiently.
Pros
- Digital display with ±1°F temperature accuracy
- Durable copper immersion heating elements
- Self-modulation adjusts power to demand
- Compact 3.5-inch depth for tight spaces
Cons
- Lower flow rate than 27kW competitors
- No smart home connectivity listed
- Basic digital interface without app control
Good fit if
- You need precise temperature control within 1°F
- You have limited wall space for installation
- You prefer durable copper heating elements
Skip if
- You require higher flow rates for multiple bathrooms
- You want remote monitoring via smartphone app
- You need WiFi integration for smart homes
Verdict: Rheem 18kW Whole House Electric Heater offers precise temperature control and a compact footprint. It fits homes prioritizing durability and accuracy over maximum flow rate or smart features.
Ranein 18kW 4.3 GPM Electric Water Heater
Best for: Whole-house electric hot water with precise temp control
- 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 up to 4.3 GPM at 240V. It features a compact 13.8-inch width and precise temperature control from 86°F to 131°F. This electric model suits whole-house needs with 99% thermal efficiency. You get consistent hot water for multiple outlets. The design saves space and reduces standby heat loss.
Pros
- Maximum flow rate of 4.3 GPM
- 18 kW power output for whole-house use
- Adjustable temperature in 1°F increments
- CSA certified for safety standards
- Compact dimensions of 13.8 x 3.1 x 18.7 inches
Cons
- Requires two dedicated 240V circuits with 40A breakers
- Uses 8 AWG cables for installation
- No Wi-Fi or smart connectivity features
Good fit if
- You need a high-flow electric heater for whole-house use
- You want precise temperature adjustments in 1°F steps
- You have the electrical capacity for dual 40A circuits
Skip if
- You require smart home integration or app control
- You cannot install two dedicated 240V circuits
- You need a flow rate higher than 4.3 GPM
Verdict: Ranein 18kW Electric Tankless Water Heater fits homes needing reliable whole-house hot water with precise temperature control. It suits users with the necessary electrical infrastructure for dual 40A circuits.
SIVUATEK 27kW Electric Tankless Water Heater
Best for: high-demand whole-house hot water needs
- Fuel Type
- Electric
- Wattage
- 27 kW
- Voltage
- 240 V
- Temperature Control
- 86°F–131°F, ±1°F
- Certification
- ETL
- Dimensions
- 15.87" x 11.14" x 2.87"
View on Amazon: SIVUATEK 27kW Electric Tankless Water Heater Affiliate link
The SIVUATEk 27kW unit delivers high-output hot water for whole-house use. It features 27kW of heating power and 99.8% thermal efficiency. The LED display allows precise temperature control from 86°F to 131°F in 1°F increments. It requires a 3 x 40-amp circuit breaker. This model suits homes needing steady flow for multiple simultaneous usage points without standby energy loss.
Pros
- 27kW heating power supports 4–5 simultaneous usage points
- 99.8% thermal efficiency reduces energy waste
- LED display sets temperature in 1°F increments
- Water-electricity separation technology prevents scale buildup
Cons
- Requires three 40-amp circuit breakers
- No smart Wi-Fi connectivity mentioned
- Temperature range maxes out at 131°F
Good fit if
- You need high flow for multiple bathrooms
- You have the electrical capacity for 120 amps total
- You prefer precise manual temperature adjustments
Skip if
- You only have standard 20-amp circuits available
- You want remote app control for temperature
- You need water temperatures above 131°F
Verdict: SIVUATEK 27kW Electric Tankless Water Heater provides reliable, high-volume hot water for large households with robust electrical infrastructure. It is ideal for users who prioritize raw heating power and precise manual control over smart features.
Orbek 18kW 240V Tankless Electric Water Heater
Best for: Compact whole-house hot water with basic safety
- Fuel Type
- Electric
- Flow Rate
- 4.22 GPM
- Wattage
- 18 kW
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 17 x 13 x 3.9 inches
View on Amazon: Orbek 18kW 240V Tankless Electric Water Heater Affiliate link
The Oberk 18kW unit delivers 240V electric heating for whole-house use. It features a compact wall-mounted design measuring 13 by 17 by 3.9 inches. The system provides endless hot water up to 140°F with instant activation. Energy savings reach 99% when flow decreases. ETL certification ensures safety against leakage and overheat. This model suits homes needing reliable hot water for two to three points simultaneously.
Pros
- 18kW output provides continuous hot water up to 140°F
- Compact 13 x 17 x 3.9 inch wall-mounted design saves space
- ETL certified for leakage, overheat, and dry-fire protection
- 99% energy savings when water flow decreases
Cons
- Requires two 40-amp double-pole breakers and 8/2 AWG wiring
- Maximum amperage of 75A limits installation flexibility
- No Wi-Fi or smart control features listed in specifications
Good fit if
- You need a compact unit for tight installation spaces
- You have existing 240V electrical infrastructure with adequate breaker capacity
- You prioritize basic safety certifications over smart features
Skip if
- You require Wi-Fi connectivity for remote monitoring
- You cannot install two separate 40-amp double-pole breakers
- You need a higher flow rate than 18kW provides
Verdict: The Oberk 18kW 240V Electric Tankless Water Heater fits homeowners who need a space-saving, ETL-certified solution for two to three simultaneous hot water points. It is a practical choice for those with the necessary electrical setup who do not require smart home integration.
Westinghouse 24kW WiFi Tankless Water Heater
Best for: Homes with 100A electrical capacity
- Fuel Type
- Electric
- Flow Rate
- 5.55 GPM
- Wattage
- 24kW
- Voltage
- 240V
- Temperature Control
- 86-140℉
- Certification
- ETL
View on Amazon: Westinghouse 24kW WiFi Tankless Water Heater Affiliate link
The Westinghouse 24kW unit delivers up to 5.55 GPM of hot water at 240V. Its compact 17 x 13 x 4.3 inch frame mounts flush to the wall. You get smart WiFi control for remote temperature adjustments. This whole-house electric heater suits apartments and small homes needing reliable on-demand heat without large storage tanks.
Pros
- 24kW heating element provides up to 5.55 GPM flow
- Smart WiFi allows remote temperature control and monitoring
- Compact 17.1-inch height saves space with flush mounting
- Low 0.79 GPM starting flow rate activates easily
Cons
- Requires a heavy 100A electrical circuit
- Needs three 40A double-pole breakers
- Uses thick 8 AWG wiring for installation
Good fit if
- You have the electrical capacity for a 100A circuit
- You want remote temperature control via an app
- You need a compact unit for tight spaces
Skip if
- You cannot install a 100A electrical circuit
- You lack space for three double-pole breakers
- You prefer a simpler non-smart appliance
Verdict: Westinghouse 24kW WiFi Tankless Heater offers high flow and smart features for homes with robust electrical setups. It fits buyers who need remote control and compact sizing but must verify their wiring can handle the 100A demand.
NOVIEEX 27kW 7.4 GPM Electric Tankless Water Heater
Best for: High-demand whole-house hot water
- Fuel Type
- Electric
- Flow Rate
- 7.4 GPM
- Wattage
- 27kW
- Installation Location
- Indoor
- Voltage
- 240V
- Temperature Control
- 77°F to 140°F, 1°F increments
View on Amazon: NOVIEEX 27kW 7.4 GPM Electric Tankless Water Heater Affiliate link
This NOVIEEX unit delivers 27kW of power at 240V, supporting a maximum flow of 7.4 GPM. It features a slim 3.18-inch depth, making it suitable for tight indoor spaces. The LED display allows precise temperature control in 1°F increments. It is designed for whole-house use, handling multiple simultaneous water applications efficiently.
Pros
- 27kW heating element for high output
- 7.4 GPM maximum flow rate
- Slim 3.18-inch depth for compact installation
- 1°F precise temperature adjustments
Cons
- Requires three separate 40A double-pole circuit breakers
- Needs three sets of 8 AWG wires
- Only includes a 1-year warranty
Good fit if
- You have a robust 240V electrical panel
- You need high flow for multiple bathrooms
- You want precise temperature control
Skip if
- You cannot install three 40A breakers
- You lack space for 8 AWG wiring
- You prefer a longer warranty period
Verdict: NOVIEEX 27kW Electric Tankless Heater offers high capacity for large homes with strong electrical systems, but its demanding power requirements limit it to specific installations.
Specifications side by side
| Spec | Eemax Series Two Whole House Tankless Water Heater | Rheem 18kW 240V Electric Tankless Water Heater | Ranein 18kW 4.3 GPM Electric Water Heater | SIVUATEK 27kW Electric Tankless Water Heater | Orbek 18kW 240V Tankless Electric Water Heater | Westinghouse 24kW WiFi Tankless Water Heater | NOVIEEX 27kW 7.4 GPM Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | 2 GPM | 4.4 GPM | 4.3 GPM | not specified | 4.22 GPM | 5.55 GPM | 7.4 GPM |
| Wattage | not specified | 18 kW | 18 kW | 27 kW | 18 kW | 24kW | 27kW |
| Installation Location | not specified | not specified | not specified | not specified | not specified | not specified | Indoor |
| Capacity | 3 gallons | not specified | not specified | not specified | not specified | not specified | not specified |
| Voltage | not specified | 240 V | 240 V | 240 V | 240V | 240V | 240V |
| Temperature Control | Thermostatic control | ±1°F | 86°F to 131°F, 1°F increments | 86°F–131°F, ±1°F | not specified | 86-140℉ | 77°F to 140°F, 1°F increments |
| Certification | not specified | not specified | CSA | ETL | ETL | ETL | not specified |
| Dimensions | 10.50 x 3.00 x 10.00 inches | 3.5 x 14.5 x 18.5 inches | not specified | 15.87" x 11.14" x 2.87" | 17 x 13 x 3.9 inches | 17" H × 13" W × 4.3" D | 15.86" H x 14.13" W x 3.18" D |
| Use | Whole House | Whole House | Whole House | Whole House | Whole House | Whole House | Whole House |
| Features | not specified | not specified | not specified | not specified | not specified | WiFi | not specified |
| Weight | 4 pounds | 14.8 pounds | 17.4 pounds | not specified | not specified | 17 pounds | not specified |
| Size | 10.50 x 3.00 x 10.00 inches | Small | not specified | not specified | M-18 | L-24 | not specified |
| Color | White | Gray | Gray | Gray | Snow | Gray 24 | Silver |
| Model | EX190TC | RTEX-18 | RE18K | TSB-270 | HEU-ET018A5W-M0 | WET-24K-G | DS-18 |
Frequently asked questions
Which alternative offers the highest wattage for whole-house use?
The SIVUATEK 27kW and NOVIEEX 27kW models provide the highest heating power in this list. Both units deliver 27 kW of energy, making them suitable for large households with robust electrical infrastructure. These models prioritize raw heating capacity over compact sizing, ensuring reliable hot water for multiple simultaneous fixtures.
Are there smart features available in these electric tankless heaters?
Yes, the Westinghouse 24kW model includes WiFi connectivity for remote control and monitoring. This feature allows you to adjust settings from a distance, which is useful for managing energy use. Most other listed units, such as the Rheem and Eemax models, focus on manual thermostatic control without digital integration.
Which unit is the most compact for tight spaces?
The Eemax EX190TC remains the most compact option with a 3-inch width. If you need an alternative, the Orbek 18kW measures just 8 inches wide and 11 inches high. Its small footprint makes it ideal for tight closets or under-sink installations where space is limited but basic safety features are still required.
What electrical requirements do these whole-house heaters need?
Most units in this list require a 240V power supply. Higher wattage models like the SIVUATEK 27kW and NOVIEEX 27kW demand significant electrical capacity, often requiring a 100A service panel. The Ranein 18kW specifically needs dual 40A circuits. Always verify your home’s electrical infrastructure can handle the specific amp and voltage demands before installing.
Which heater is best for precise temperature control?
The Rheem 18kW and Ranein 18kW models are highlighted for precise temperature control. Rheem offers this in a durable, gray unit, while Ranein provides it alongside a 4.3 GPM flow rate. Both allow you to maintain consistent water temperatures, which is essential for comfort in whole-house applications where flow rates vary.
Can I install these units indoors?
The NOVIEEX 27kW is explicitly rated for indoor installation, featuring a silver finish suitable for interior environments. Other units like the Eemax and Rheem are also designed for indoor use, given their compact electric designs. Always check the specific installation location ratings for each model to ensure compliance with local building codes and safety standards.
How do these alternatives compare in physical weight?
Weights vary significantly across the list. The original Eemax EX190TC is very light at 4 pounds. In contrast, the Ranein 18kW weighs 17.4 pounds, and the Westinghouse 24kW weighs 17 pounds. Heavier units often indicate more robust internal components, but you must ensure your mounting surface can support the specific weight of your chosen model.