GRS Tankless Water Heater Electric Alternatives: 6 Similar Picks Compared
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You are looking for grs tankless water heater electric alternatives because your needs may differ from the original model. The GRS 13 kW unit offers a compact wall-mount design with a digital display and 240V operation. It provides instant hot water for small spaces like RVs or single bathrooms. However, you might need a different flow rate, a different wattage, or a different installation size. Some users prefer a higher capacity unit for whole-house use, while others need a smaller footprint for tight cabinets. This list covers 6 similar picks that share key specifications with the GRS heater. These alternatives were chosen because their specs overlap with the original. They all use 240V electric power and offer on-demand heating. You can compare their dimensions, wattage, and features to find the right fit for your home. Each option provides reliable performance for different use cases. Whether you need a budget-friendly choice or a premium model, this guide helps you decide. The products here maintain the core benefits of tankless technology while offering variations in size and power. You can select the unit that matches your electrical capacity and hot water demands. This approach ensures you find a practical solution without compromising on efficiency.
Our top pick: GRS 13 kW Digital Tankless Water Heater.
How each alternative compares
NOVIEEX 13kW Electric Tankless Heater
The NOVIEEX 13kW model matches the GRS unit’s 13 kW output and 240V requirement, making it a direct swap for single-bathroom setups. It shares the digital display feature for precise temperature control. The NOVIEEX unit is slightly taller at 15.9 inches compared to the GRS 3.34-inch height, which may affect vertical clearance. It weighs more than the GRS unit, adding stability but complicating wall mounting. Both are indoor-only electric heaters. Choose the NOVIEEX if you prefer a silver finish or need the specific DS-18 model dimensions for your plumbing layout. It offers similar on-demand efficiency without the compact vertical footprint of the GRS design.
Kweetle 13 kW Tankless Water Heater
The Kweetle 13kW heater provides the same 13 kW power and 240V input as the GRS model but emphasizes flow rate and durability. It features a cast aluminum heating element, which may offer longer lifespan than standard elements. The unit includes overheat protection, a safety feature also found in the GRS model. Its dimensions are wider at 10.9 inches compared to the GRS 9.68-inch width, but it is significantly thinner at 2.95 inches. This makes it a better fit for tight horizontal spaces. It weighs less than the GRS unit, easing installation. Select this option if you prioritize a high flow rate of 3.38 GPM and want a slimmer profile for your wall installation.
EcoSmart 13 kW Electric Tankless Water Heater
The EcoSmart ECO 11 matches the GRS 13 kW power rating and 240V operation but lacks a digital display. This means you cannot see the exact water temperature, relying instead on manual adjustments. Its dimensions are notably different, with a width of 13.5 inches and a depth of 6.5 inches, making it bulkier than the GRS unit. It weighs only 6.5 pounds, which is lighter than the GRS 10.2-pound unit. This model is best for mild climates where incoming water is not freezing. Choose the EcoSmart if you prefer a simpler mechanical interface and have the space for a wider unit. It sacrifices temperature visibility for a potentially simpler, more robust mechanical design.
Ranein 13 kW Tankless Water Heater
The Ranein 13kW unit offers the same 13 kW output and 240V requirement as the GRS model. It is designed for single-point sinks or light dual-use setups. Its dimensions are wider at 11.2 inches and taller at 12.9 inches compared to the GRS unit, making it less compact. It weighs 8.38 pounds, which is lighter than the GRS 10.2-pound model. The Ranein model does not list a digital display in its attributes, suggesting a manual control interface. This makes it a good choice for users who prioritize precise heating for light daily use over advanced features. Select this alternative if you need a gray finish and have ample wall space for a larger footprint unit.
NOVIEEX 27kW Electric Tankless Heater
The NOVIEEX 27kW model doubles the power of the GRS 13kW unit, offering 27 kW at 240V. This higher wattage supports whole-house hot water needs rather than single-point use. It includes a digital display, similar to the GRS model, for precise temperature management. The unit is significantly larger, measuring 14.1 inches in width and 15.9 inches in height. It requires a high electrical capacity, unlike the GRS unit which suits smaller circuits. Choose this option if you have a large household and adequate wiring infrastructure. It provides higher flow rates and temperature stability for multiple simultaneous uses, sacrificing the compact size and lower power requirements of the GRS 13kW model.
Erinaik 8kW 240V Tankless Water Heater
The Erinaik 8kW heater offers lower power than the GRS 13kW model, providing 8 kW at 240V. It is designed for single-sink installations where space is tight. The unit is much thinner at 2.95 inches deep compared to the GRS 3.34-inch depth, but it is taller at 10.8 inches. It includes overheat protection and a digital display, matching the GRS safety and visibility features. However, it lacks the higher flow rate of the GRS unit. Select this alternative if you need a compact solution for a single sink and value precise manual adjustments. It is ideal for users who prioritize space-saving dimensions over high-volume hot water delivery.
Quick picks
Our 7 picks
GRS 13 kW Digital Tankless Water Heater
Best for: small indoor bathrooms and RVs
- Fuel Type
- Electric
- Wattage
- 13 kW
- Installation Location
- Indoor
- Voltage
- 240 V
- Dimensions
- 14.1 x 9.68 x 3.34 inches
- Features
- Digital Display
View on Amazon: GRS 13 kW Digital Tankless Water Heater Affiliate link
The GRS 13kW unit delivers on-demand hot water using 240V power. It features a compact 14.1 x 9.68 x 3.34 inch design that mounts on the wall. A digital display lets you set precise temperatures. Safety includes overheat and dry heating protection. This model suits small bathrooms, RVs, or point-of-use installations where space is limited.
Pros
- 13 kW heating power for instant hot water
- Compact wall-mount design saves floor space
- Digital display for temperature control
- Built-in overheat and dry heating protection
Cons
- Indoor installation only
- 10.2 pounds weight requires sturdy mounting
- No mention of flow rate in GPM
Good fit if
- You need a compact unit for a small bathroom
- You want precise temperature control via a digital display
- You are installing in an indoor location with 240V power
Skip if
- You require outdoor installation capabilities
- You need a high-flow unit for multiple simultaneous sinks
- You prefer a larger tank-based system for storage
Verdict: GRS 13kW Electric Tankless Water Heater fits small indoor spaces where wall mounting is possible. It provides reliable instant heat for single-point use or small bathrooms.
NOVIEEX 13kW Electric Tankless Heater
Best for: Single-bathroom homes with 60A circuits
- Fuel Type
- Electric
- Flow Rate
- 3.6 GPM
- Wattage
- 13kW
- Voltage
- 240V
- Temperature Control
- 77-140°F
- Dimensions
- 15.9 x 11.1 x 11.1 inches
View on Amazon: NOVIEEX 13kW Electric Tankless Heater Affiliate link
The NOVIEEX 13kW unit delivers up to 3.6 GPM at 240V. It features a 99.8% efficiency rating and precise temperature control from 77°F to 140°F. The slim design saves space in tight areas. You get instant hot water for one or two fixtures. This model suits small homes or apartments needing reliable, on-demand heating without a storage tank.
Pros
- High 13kW power output for 3.6 GPM flow
- 99.8% heating efficiency reduces standby loss
- LED display allows 1°F temperature adjustments
- Compact wall-mounted design saves space
Cons
- Requires a 60A double-pole circuit breaker
- Needs 6 AWG wiring for installation
- Limited to 1-year warranty coverage
Good fit if
- You need hot water for a single bathroom
- You have a dedicated 60A electrical circuit
- You want precise temperature control settings
Skip if
- You lack the required 6 AWG wiring
- You need more than two simultaneous fixtures
- You require a warranty longer than one year
Verdict: NOVIEEX 13kW Electric Tankless Heater fits small households with strong electrical capacity. It provides steady hot water for one or two sinks or showers. Choose this if you have the right wiring and need compact, efficient heating.
Kweetle 13 kW Tankless Water Heater
Best for: High-flow hardwired installations
- Fuel Type
- Electric
- Flow Rate
- 3.38 GPM
- Wattage
- 13kW
- Voltage
- 240V
- Temperature Control
- 86 to 131°F
- Certification
- CSA
View on Amazon: Kweetle 13 kW Tankless Water Heater Affiliate link
The Kweetle 13kW electric tankless water heater delivers instant hot water with a flow rate of 3.38 GPM at 240V. It features a cast aluminum heating element to reduce mineral buildup and an LED digital display for real-time temperature monitoring. The adjustable range spans 86 to 131°F. This unit requires hardwiring with a 60A double-pole circuit breaker and 6AWG wire. It is CSA certified for safety.
Pros
- High flow rate of 3.38 GPM for steady hot water
- Cast aluminum one-piece heating element resists corrosion
- LED digital display shows real-time water temperature
- CSA certified with overheat and dry burn protection
Cons
- Requires hardwiring with a 60A double-pole circuit breaker
- Heavier at 5.7 pounds compared to lighter competitors
- Limited temperature adjustment range of 86 to 131°F
Good fit if
- You need a high-flow unit for multiple outlets
- You prefer hardwired installations with dedicated circuits
- You want real-time temperature monitoring via LED display
Skip if
- You require a standard plug-in connection
- Your electrical panel cannot support a 60A breaker
- You need a wider temperature adjustment range
Verdict: Kweetle 13kW Electric Tankless Heater offers robust performance with a 3.38 GPM flow rate and durable cast aluminum heating element. It suits homeowners who can install a dedicated 60A circuit and value precise temperature visibility.
EcoSmart 13 kW Electric Tankless Water Heater
Best for: mild climates and compact installations
- Fuel Type
- Electric
- Wattage
- 13 kW
- Voltage
- 240 V
- Dimensions
- 10 x 13.5 x 6.5 inches
- Weight
- 6.5 pounds
View on Amazon: EcoSmart 13 kW Electric Tankless Water Heater Affiliate link
The EcoSmart ECO 11 is a compact electric tankless water heater rated at 13 kW and 240 volts. It uses self-modulating technology to adjust energy use based on demand. Measuring 10 by 13.5 by 6.5 inches and weighing 6.5 pounds, it fits tight spaces. This unit is designed for climates with moderate incoming water temperatures around 60 degrees Fahrenheit.
Pros
- 13 kW power output for instant hot water
- 240 V electrical requirement for efficient heating
- Patented self-modulating technology adjusts energy use
- Compact 10 x 13.5 x 6.5 inch footprint
Cons
- Limited to climates with 60 degree incoming water temperatures
- No digital display mentioned in specifications
- Single voltage configuration limits installation flexibility
Good fit if
- You live in a mild climate with moderate water temperatures
- You need a compact unit for tight spaces
- You want a simple electric solution without complex controls
Skip if
- You live in a cold climate with low incoming water temperatures
- You require a digital display for temperature monitoring
- You need a unit compatible with 120 V circuits
Verdict: EcoSmart ECO 11 13kW Electric Heater suits buyers in mild climates who prioritize compact size and efficient energy use over advanced features. It delivers reliable instant hot water for single sink applications where incoming water is not freezing.
Ranein 13 kW Tankless Water Heater
Best for: single-point sinks or light dual-use setups
- Fuel Type
- Electric
- Flow Rate
- Up to 3.1 GPM
- Wattage
- 13 kW
- Voltage
- 240V
- Temperature Control
- 86°F–131°F, ±1°F
- Dimensions
- 10.7 x 7.9 x 2.8 inches
View on Amazon: Ranein 13 kW Tankless Water Heater Affiliate link
The Ranein 13kW unit delivers instant hot water at up to 3.1 GPM on a 240V circuit. It features an LED display and knob controls for precise temperature adjustments from 86°F to 131°F. Its compact dimensions allow installation in tight spaces like under sinks. This heater suits single-point applications or light dual-use setups where energy efficiency and steady flow are priorities.
Pros
- 13 kW heating power supports up to 3.1 GPM flow
- LED display shows temperature with 1°F precision
- 99% thermal efficiency reduces standby energy loss
- Internal wiring allows housing-free installation
Cons
- Requires a dedicated 60A circuit breaker
- Limited to 240V electrical systems
- Max flow may struggle with simultaneous shower and sink use
Good fit if
- You need a compact heater for a single sink or small bathroom
- You have a 240V circuit with 60A capacity available
- You want precise temperature control via an LED display
Skip if
- You require a 120V plug-in unit without electrical upgrades
- You need high flow for multiple simultaneous showers
- You prefer digital app-based temperature management
Verdict: Ranein 13kW Electric Tankless Water Heater fits users with 240V power who need precise, efficient heating for light to moderate daily use. It is a solid option for single-point applications where space and energy savings matter.
NOVIEEX 27kW Electric Tankless Heater
Best for: Whole-house hot water with high electrical capacity
- Fuel Type
- Electric
- Flow Rate
- 7.4 GPM
- Wattage
- 27kW
- Voltage
- 240V
- Temperature Control
- 77°F to 140°F, 1°F increments
- Certification
- IPX4
View on Amazon: NOVIEEX 27kW Electric Tankless Heater Affiliate link
The NOVIEEX 27kW unit is a high-capacity electric tankless water heater designed for whole-house use. It delivers up to 7.4 GPM at 240V, supporting three to four simultaneous water applications. The device features an LED digital display with 1°F increments for precise temperature control between 77°F and 140°F. Its 99.8% energy conversion efficiency eliminates standby heat loss. This model suits larger homes requiring heavy-duty, instant hot water without the bulk of storage tanks.
Pros
- Delivers up to 7.4 GPM flow rate
- 27kW power output for whole-house demand
- Precise 1°F temperature increments on LED display
- 99.8% energy conversion efficiency
Cons
- Requires three 40A double-pole circuit breakers
- Needs 8 AWG wiring for each circuit
- 1-year warranty is shorter than industry standard
Good fit if
- You need hot water for multiple bathrooms
- You have the electrical capacity for 112.5A load
- You want precise temperature control
Skip if
- You cannot install three 40A breakers
- You lack space for 8 AWG wiring
- You need a longer warranty period
Verdict: NOVIEEX 27kW Electric Tankless Water Heater is a powerful solution for large households with adequate electrical infrastructure. It fits buyers who prioritize high flow rates and precise temperature management over easy installation.
Erinaik 8kW 240V Tankless Water Heater
Best for: Single sink hot water needs
- Fuel Type
- Electric
- Flow Rate
- 1.9 GPM
- Wattage
- 8,000W
- Voltage
- 240V
- Temperature Control
- 86–131°F
- Certification
- CSA
View on Amazon: Erinaik 8kW 240V Tankless Water Heater Affiliate link
The Erinaik 8kW unit is a compact electric tankless water heater designed for low-flow applications. It delivers up to 1.9 GPM at 240V, making it suitable for single sinks. The device features self-modulating technology to adjust output based on flow. You get precise temperature control via an LED display and rotary dial, with a range of 86–131°F. It includes a wireless remote for easy adjustments. CSA certification ensures safety standards are met.
Pros
- 8,000W heating capacity for instant hot water
- Includes wireless remote control for convenience
- CSA certified with overheat and dry-heating protection
- Self-modulating technology adjusts to flow rate
- Compact dimensions of 10.8" H x 2.95" W x 2.95" D
Cons
- Lower 1.9 GPM flow rate limits use to single sinks
- Requires 40A double-pole breaker and 8 AWG wiring
- No Wi-Fi or smart app connectivity
Good fit if
- You need a heater for a single bathroom sink
- You want precise temperature control via a remote
- You have the required 40A electrical circuit available
Skip if
- You need hot water for multiple fixtures simultaneously
- Your electrical panel cannot support a 40A breaker
- You require smart home integration or app control
Verdict: Erinaik 8kW Electric Tankless Heater is a solid choice for single-sink installations where space is tight and remote control is valued. It fits buyers who prioritize safety certifications and precise manual adjustments over high flow rates.
Specifications side by side
| Spec | GRS 13 kW Digital Tankless Water Heater | NOVIEEX 13kW Electric Tankless Heater | Kweetle 13 kW Tankless Water Heater | EcoSmart 13 kW Electric Tankless Water Heater | Ranein 13 kW Tankless Water Heater | NOVIEEX 27kW Electric Tankless Heater | Erinaik 8kW 240V Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | not stated | 3.6 GPM | 3.38 GPM | not stated | Up to 3.1 GPM | 7.4 GPM | 1.9 GPM |
| Wattage | 13 kW | 13kW | 13kW | 13 kW | 13 kW | 27kW | 8,000W |
| Installation Location | Indoor | not stated | not stated | not stated | not stated | not stated | not stated |
| Voltage | 240 V | 240V | 240V | 240 V | 240V | 240V | 240V |
| Temperature Control | not stated | 77-140°F | 86 to 131°F | not stated | 86°F–131°F, ±1°F | 77°F to 140°F, 1°F increments | 86–131°F |
| Certification | not stated | not stated | CSA | not stated | not stated | IPX4 | CSA |
| Dimensions | 14.1 x 9.68 x 3.34 inches | 15.9 x 11.1 x 11.1 inches | 2.95 x 10.9 x 10.9 inches | 10 x 13.5 x 6.5 inches | 10.7 x 7.9 x 2.8 inches | 14.13 x 15.86 x 3.18 inches | 10.8" H x 2.95" W x 2.95" D |
| Features | Digital Display | Digital Display | Digital Display, Overheat Protection | not stated | not stated | Digital Display | Digital Display, Overheat Protection |
| Weight | 10.2 pounds | not stated | 5.7 pounds | 6.5 pounds | 8.38 pounds | not stated | not stated |
| Color | Gray | Silver | 13kW | color | Gray | Silver | 8kW |
| Model | JN | DS-18 | 13kW | ECO 11 | RE13K (13kW) | DS-18 | 8kW |
| Size | not stated | not stated | 13KW | 12 x 8 x 4 | not stated | not stated | 8KW |
If you also require outdoor heating, you can review specifications for hykolity electric patio heater alternatives.
Frequently asked questions
Can I replace my GRS heater with a 13 kW model?
Yes, several 13 kW units serve as direct alternatives. The NOVIEEX and Kweetle models share the same 13 kW output and 240V requirement. They fit similar small spaces and single-bathroom setups. Ensure your electrical panel supports a 60A circuit for safe operation.
What is the difference between 13 kW and 27 kW electric heaters?
The wattage determines your hot water flow rate. The 27 kW NOVIEEX unit delivers higher flow for whole-house needs. The 13 kW models suit single sinks or small bathrooms. Higher wattage requires more robust electrical infrastructure to maintain consistent temperature.
Do these electric tankless heaters include digital displays?
Most listed alternatives feature digital temperature displays. The GRS, NOVIEEX, Kweetle, and Erinaik models all include this feature for precise control. The EcoSmart and Ranein models do not list a digital display in their specifications. Check the attributes for each unit.
Which alternative is best for a small indoor bathroom?
The GRS 13 kW unit is ideal for small indoor bathrooms. It has a compact footprint measuring 9.68 inches wide. The NOVIEEX 13 kW is also suitable for single-bathroom homes. Both provide instant heat for single-point use in tight spaces.
Is overheat protection included in these electric models?
Safety features vary by brand. The Kweetle and Erinaik models explicitly list overheat protection in their attributes. Other models like the GRS and EcoSmart do not mention this specific feature in the provided data. Verify the safety specs before installation.
How much space do these heaters require for installation?
Dimensions vary significantly across the list. The GRS unit is 14.1 inches long and 3.34 inches high. The NOVIEEX 27 kW model is larger at 15.9 inches high. Measure your available wall space to ensure the unit fits your specific layout.