Contents
- The Top 9
- Top 9 Tankless Water Heaters Reviewed in Detail
- 1. Editor’s Choice
- 2. Best Premium
- 3. Best Compact
- 4. Best Design
- 5. Best Value
- 6. Best Splurge
- 7. Best Lightweight
- 8. Most Versatile
- 9. Best Budget
- Tankless Water Heaters Compared Side by Side
- How to Choose Tankless Water Heaters
- How We Reviewed
- Frequently asked questions
- What to look for
Choosing the best tankless water heater electric can be tough. Our top pick is the XWDZSWGS 110V Tankless Water Heater. It has a powerful 3000W and raises water temperature quickly by 82°F in just seconds. If you want to save some money, consider the Rheem 11kW model. It offers a lower flow rate and power, which may not suit larger households.
The main tradeoff is between flow rate and power. The Rheem 18kW can deliver up to 4.4 gallons per minute, while the XWDZSWGS has a lower output. This article will help guide you through other top choices and their features.
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The Top 9
Top 9 Tankless Water Heaters Reviewed in Detail
Here are some of the best electric tankless water heaters on the market.
1. Editor’s Choice
110V Tankless Water Heater Electric, 3000W Tankless Electric Water Heater Instant, Under Sink Water Heater with Digital Display, On Demand Hot Water Heaters…
- Tankless Electric Water Heater – This electric tankless water heater uses stainless steel and ABS materials, LED display. With 3000W power, the electric water heater tankless can raise the water by 82° F(0.3GPM) -131° F(0.5GPM) in seconds. The instant water heater can set Fahrenheit or Celsius degrees by holding the power button for 6 seconds. This 110 volt electric tankless hot water heater uses advanced technology, no need to preheat, eliminating the long waiting time for hot water!
- Safety Intelligence Reliable – This instant hot water heater has multiple protection functions. IPX4 waterproof, water and electricity isolation, leakage protection, dry boil protection, and automatic power off under overheating and inactivity. On demand water heater with LCD digital display, intelligent detection of working status, and performance. The thermal efficiency of electric hot water heater is as high as 98%, allowing you to enjoy hot water at any time and save energy.
- Efficient And Compact Design – This tankless hot water heater electric has a compact design, perfect for spaces such as kitchens, apartments, bathrooms, RVs, and camping. The on demand water heater electric adopts a wall-mounted design, freeing up valuable space for your home, enjoy hot water at any time. This instant electric water heater qualifies for ETL standard. You can expect the outstanding performance of this on demand electric water heater in the coming years.
- Easy To Install And Application – This electric instant hot water heater comes with pre-fabricated set screw holes, English instructions, and 1/2 inch NPT standard connections. This small tankless water heater electric has a simple design and is quick and easy to install, saving time. This tankless water heater electric 110v is ideal for spaces such as kitchens, apartments, bathrooms, RVs, and camping. TIP: Not Suitable for showers (Shower normally requires at least 1.8 GPM).
- Importance For Installation – ① The 110v point of use water heater for vertical installation only, no horizontal installation is allowed to avoid malfunction of the heating elements (E2). ② The electric tankless water heaters tighten the pipe connectors with Teflon tape to prevent a short circuit (E2). ③ This under sink water heater is recommended to be connected with wires with a cross-sectional area of ≥ 2.5 square millimeters, and connected to trip switches of over 32A for use.
- Outstanding Customer Service – We provide a 24-month warranty for the instant water heater under sink. If you encounter any after-sales issues regarding the mini tankless water heater, you can always contact our small water heater electricsupport team. This 110v tankless water heater electric can be used for an unlimited time. Thanks for choosing our best 110v tankless water heater.
The XWDZSWGS 110V Tankless Water Heater Electric is our top choice for the best tankless water heater electric. This model features a powerful 3000W motor that can heat water quickly, raising the temperature by 82°F in mere seconds. Its compact design makes it suitable for tight spaces under sinks, allowing for easy installation. Compared to the Rheem models, the XWDZSWGS is more budget-friendly while still providing reliable hot water on demand.
While the XWDZSWGS does not provide as high a flow rate as some larger models, it is perfect for smaller households. Its lower GPM output means it’s best for one or two hot water uses at a time. Other models, like the Rheem 18kW, can deliver more hot water but may not fit smaller spaces as easily.
One limitation is its lower flow rate, which can be a drawback for larger families needing multiple hot water sources simultaneously. If you have a bigger home or need to use hot water in several places, you may want to consider other options.
Pros
- 3000W power for quick heating
- Compact design fits under sinks
- LED display for temperature settings
- Affordable option for budget buyers
Cons
- Lower GPM flow rate for larger homes
- Not suitable for multiple simultaneous uses
- Limited to smaller space installations
Best for: Small households needing instant hot water.
Not ideal for: Larger families requiring multiple hot water sources.
A compact and efficient choice for small spaces.
2. Best Premium
Rheem 18kW 240V Tankless Electric Water Heater, Gray
- External digital thermostatic control with LED display (+/1 degree accuracy)
- Most advanced self-modulation, adjust power to meet hot water demand
- Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
- Simple installation – bottom 3/4 inch NPT water connections
- Threaded for easy replacement, simple installation, digital temperature display
The Rheem 18kW 240V Tankless Electric Water Heater is a premium option in this category. It features advanced self-modulation technology, adjusting power based on demand. With a flow rate of 4.4 GPM, it is ideal for larger households needing consistent hot water for multiple uses. The durable copper heating elements enhance its lifespan and efficiency, making it a strong contender for long-term use.
This model can heat water sufficiently for several showers running at once, unlike smaller models. It is more powerful than the XWDZSWGS and perfect for homes with higher hot water needs. While it offers excellent performance, the installation may require professional help due to its higher power requirements.
One drawback is its larger size. It needs more installation space compared to compact models. If space is a concern, you may want to explore smaller options that fit in tighter areas.
Pros
- 4.4 GPM flow rate for multiple hot water uses
- Self-modulating technology for energy efficiency
- Durable copper heating elements
- Easy installation with threaded connections
Cons
- Requires more installation space
- Higher power requirements for setup
- May need professional installation
Best for: Larger households needing high hot water output.
Not ideal for: Small spaces with limited installation options.
A powerful choice for those needing consistent hot water access.
3. Best Compact
Rheem 11kW Multi Fixture Tankless Electric Water Heater – 240V
- Get the performance you expect. Choose the right size water heater for your home and verify electrical requirements before installation. When properly sized and professionally installed, Rheem Tankless Electric Water Heaters deliver reliable, on-demand hot water while saving valuable space.
- 11kW model provides up to 2.68 GPM
- Multiple fixture applicatons
- Wiring Requirements (RTEX‑11): Requires 240V single‑phase power, one- 50‑amp double‑pole breaker, one set of #8 AWG copper conductors with ground, and a recommended minimum 100‑amp household electrical service panel for proper operation
- Digital thermostatic temperature controls in 1-degree increments ranging from 80°F – 140°F (26°C – 60°C)
- Saves Energy – Tankless electric water heaters only heat water when a hot water tap is turned on. By heating water only when needed elimantes energy used to maintain desired water temperature in standard tank water heaters.
- Save Space Without Sacrificing Hot Water – Compact design that frees up valuable floor space, 90% smaller than traditional tank water heaters
- No Venting required to operate, simplifying the installation process compared to a tankless gas water heater
- Warranty: 5-Year Leak, 1-Year Parts
The Rheem 11kW Multi Fixture Tankless Electric Water Heater provides reliable performance for medium-sized homes. It has a power rating of 11kW, delivering 2 GPM for hot water needs. This model is perfect for smaller families or homes with moderate hot water demands. It saves space while still providing the essential hot water your home requires.
When compared to the Rheem 18kW, this model has a lower output, making it more suitable for smaller homes. It is also more affordable than the larger models, giving it an edge for budget-conscious buyers. However, if you have more than a couple of showers running simultaneously, it might not keep up with higher demands.
A limitation of this model is its lower flow rate, which may not be sufficient for larger households. If you need to run several hot water sources at once, you might want to consider a higher-capacity model.
Pros
- Reliable performance for medium-sized homes
- Space-saving design fits in tight areas
- Affordable compared to higher output models
- Suitable for moderate hot water demands
Cons
- Lower flow rate compared to premium models
- Not ideal for larger families
- Limited to smaller hot water needs
Best for: Small to medium households with moderate hot water needs.
Not ideal for: Larger families requiring high water flow.
A dependable choice for moderate hot water demands.
4. Best Design
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
- Get the performance you expect. Choose the right size water heater for your home and verify electrical requirements before installation. When properly sized and professionally installed, Rheem Tankless Electric Water Heaters deliver reliable, on-demand hot water while saving valuable space.
- 24kW model provides up to 5.9 GPM
- Multiple fixture applicatons
- Wiring Requirements (RTEX‑24): Requires 240V single‑phase power, three – 40‑amp double‑pole breakers, three sets of #8 AWG copper conductors with ground, and a recommended minimum 200‑amp household electrical service panel for proper operation
- Digital thermostatic temperature controls in 1-degree increments ranging from 80°F – 140°F (26°C – 60°C)
- Saves Energy – Tankless electric water heaters only heat water when a hot water tap is turned on. By heating water only when needed elimantes energy used to maintain desired water temperature in standard tank water heaters.
- Save Space Without Sacrificing Hot Water – Compact design that frees up valuable floor space, 90% smaller than traditional tank water heaters
- No Venting required to operate, simplifying the installation process compared to a tankless gas water heater
- Warranty: 5-Year Leak, 1-Year Parts
The Rheem RTEX-24 24kW Electric Tankless Water Heater is designed for homes needing a high flow rate. With a power rating of 24kW, it can provide up to 5 GPM, making it suitable for larger households. Its consistent hot water supply makes it ideal for simultaneous showers or multiple hot water uses.
This model stands out due to its powerful output, far surpassing smaller models like the XWDZSWGS. The installation is user-friendly, featuring bottom connections that simplify setup for professionals. However, it does take up more space, which might be an issue for smaller homes.
One drawback is its size, which can be a problem for tighter installation spaces. If you have limited room, you might need to look for more compact options that won’t take up much space.
Pros
- 24kW power for high flow rates
- Can provide up to 5 GPM
- User-friendly installation process
- Ideal for larger households with multiple needs
Cons
- Requires more installation space
- Higher energy consumption than lower models
- May need professional installation
Best for: Large households needing high hot water flow.
Not ideal for: Smaller spaces with limited installation options.
A powerful solution for high-demand hot water needs.
5. Best Value
14kW Tankless Water Heater Electric 240V, Sink & Shower,Gray
- 【PLEASE NOTE BEFORE PURCHASE】Ensure this 14kW 240V tankless electric water heater meets your hot water demand. Requires 1 x 60-amp circuit breaker. Unit dimensions: 15.87″x11.14″x2.87″; standard 1/2″ NPT water connection. No need to disassemble the housing for wiring, making installation faster and more convenient.
- 【ENERGY-SAVING & EFFICIENT】Eliminate standby energy loss with our electric tankless water heater —no preheating, zero idle power use. Reduce your water heating costs by up to 50% compared to traditional models. Compact and space-saving, it installs flexibly under-sink or on-wall.
- 【INSTANT & POWERFUL HOT WATER】With 14kW of heating power and up to 99.8% thermal efficiency, this unit delivers endless hot water instantly—perfect for 1–2 simultaneous usage points such as kitchen and bathroom. No more waiting, just steady hot water when you need it.
- 【SMART TEMPERATURE CONTROL】Equipped with an intuitive LED display you can easily set the desired water temperature from 86°F to 131°F in precise 1°F increments. Once set, the system maintains a stable temperature output even with water pressure fluctuations.
- 【SAFE & RELIABLE OPERATION】Built with advanced water-electricity separation technology to prevent scale buildup and extend lifespan. Safety features include leakage protection, overheating protection, and auto shut-off, giving you peace of mind during every use.
The SIVUATEK 14kW Tankless Water Heater Electric is an excellent value option. It provides sufficient hot water flow while remaining budget-friendly. Designed for sink and shower use, it fits well in small spaces and has a compact design. Its efficient operation makes it a solid choice for those who want reliable hot water without breaking the bank.
While it offers a balanced performance, it does not reach the higher flow rates of premium models like the Rheem RTEX-24. This model is suitable for small households where demands for hot water are limited. Its ease of installation is an added bonus for DIY enthusiasts.
A limitation is that it may not meet the needs of larger families or homes with high hot water usage. If your household requires multiple showers running at once, consider a model with a higher output.
Pros
- Compact design for easy installation
- Affordable choice for small households
- Sufficient flow for sink and shower use
- Energy-efficient operation
Cons
- Not suitable for larger homes
- Lower flow rate compared to premium options
- Limited to basic hot water needs
Best for: Budget-conscious small households needing reliable hot water.
Not ideal for: Larger families requiring high flow rates.
An economical choice for essential hot water needs.
6. Best Splurge
Westinghouse 14kW Tankless Water Heater Electric 240V, Wifi, ETL, Gray
- 【Dedicated Circuit Requirements & Installation】This Westinghouse tankless water heater electric requires a dedicated 60A double-pole breaker and 6 AWG wire at 240V for stable, safe operation. With 1/2″ NPT connections and a compact wall-mountable design at just 12.59″H x 9.56″W x 3.28″D that takes zero floor space, this Westinghouse electric tankless water heater offers quick, hassle-free installation—whether new build or replacement, just as you’d expect from a genuine Westinghouse tankless water heater.
- 【3s Instant Heating& Strong GPM Output】This Westinghouse electric tankless water heater 240v delivers hot water in just 3 seconds with 98% thermal efficiency. The minimum start-up flow rate is 0.53 GPM.When inlet temperature is 62°F and outlet is set to 105°F, flow reaches 3.4 GPM—supporting 2 water points simultaneously. This on demand water heater brings endless instant hot water to your daily routine. That’s the reliable performance you expect from a 14kW Westinghouse tankless water heater electric.
- 【Smart WiFi , Voice Control & Temperature Memory】 Compatible with Alexa and Google Home, this 14kW Westinghouse tankless water heater lets you adjust temperature and monitor usage via simple voice commands or the mobile app from anywhere. The new temperature memory function automatically restores your last preset temperature after a power outage—no repetitive setup required. This Westinghouse electric tankless water heater makes hot water management as effortless as controlling your smart lights, making it an essential component of any modern smart home, all backed by the trusted Westinghouse name.
- 【ETL Certified Safe & Reliable】This Westinghouse tankless water heater electric is ETL certified with 4-layer protection (leakage, overheat, dry-fire, over-voltage), IPX4 rating, and separated water-electricity pathway. Upgraded anti-fog technology resists moisture, allowing installation in bathrooms. This14kW on demand water heater is built with safety you can trust from Westinghouse.
- 【Long-Lasting Durability & Scale Reduction】 The separated water-electricity pathway in this Westinghouse tankless water heater electric significantly reduces internal corrosion and scale buildup, extending the unit’s service life. A removable inlet filter and rotor can be easily taken out by hand for cleaning—we recommend rinsing them every 6 months to remove trapped sediment and scale. This simple maintenance step restores optimal water flow and ensures your Westinghouse electric tankless water heater consistently performs at its best, year after year, with the durability that Westinghouse products are famous for.
- 【Versatile Applications – The Ideal Choice for Homes & More】 This 14kW Westinghouse electric tankless water heater is purpose-built for residential use, perfectly suited for apartments, single-family homes, cabins, office restrooms, and more. Whether it’s a hot shower in the bathroom, dishwashing in the kitchen, or handwashing in a commercial restroom, this Westinghouse tankless water heater delivers a continuous, steady supply of comfortable hot water on demand. Compact size, powerful output, and smart controls make this Westinghouse tankless water heater electric the ultimate upgrade for any modern living space—reliable hot water, wherever you need it.
The Westinghouse 14kW Tankless Water Heater Electric is a splurge option with advanced features. It has a dedicated circuit requirement for safe operation and a compact wall-mountable design. With a power rating of 14kW, it offers reliable hot water supply while taking up minimal space. Its efficiency and design make it suitable for modern homes.
Compared to other models, like the SIVUATEK, it has a higher power rating and better efficiency. This makes it a great option if you want a dependable hot water source without sacrificing space. However, installation requires careful electrical setup, which may be challenging for some homeowners.
One limitation is the need for a dedicated 60A breaker, which can add to installation costs.
Pros
- Compact wall-mountable design
- 14kW power for reliable hot water supply
- Efficient operation for modern homes
- Advanced features for convenience
Cons
- Requires a dedicated circuit for installation
- Can be costly due to electrical setup
- Not suitable for DIY installations
Best for: Homeowners wanting advanced features and efficiency.
Not ideal for: DIY enthusiasts or those on a tight budget.
A sleek and efficient choice for modern homes.
7. Best Lightweight
CAMPLUX 5L Portable Tankless Water Heater, 1.32 GPM Outdoor Propane Shower for Camping, RV, Off-Grid, Instant Hot Water with Folding Handle, Overheat…
- Lightweight & Portable for Camping: Make your outdoor trips easier with this compact portable water heater. Weighing only 10 lbs with a folding handle, it fits perfectly in your car or RV. Whether you are camping, fishing, or on a family road trip, you can carry it anywhere to enjoy a warm, clean shower after a long day of fun
- Instant Hot Shower, No Waiting: Don’t let cold water ruin your mood. This tankless water heater delivers 1.32 gallons of hot water per minute (GPM) instantly. It heats up fast and keeps the temperature stable, giving you a comfortable propane shower outdoors. It is perfect for washing off beach sand, cleaning muddy dogs, or doing camp dishes with ease
- No Electricity Needed & Low Pressure Start: This water heater is born for the off-grid life. It lights up easily with just 3.0 PSI of water pressure, making it work perfectly with a small 12V water pump or even a gravity water bag. It is the best choice for rural cabins and deep woods camping
- Versatile Applications：This water heater powered by 2 D-size batteries, perfect for off-grid, rural areas, RVs and remote cabins. Pair it with our custom RB5 heavy-duty wall bracket and D52 dolly cart to solve hanging hassles, enabling stable, easy mounting for warm, reliable hot water anywhere outdoors.
- Safe for Family & Pets (CSA Certified) Safety comes first. This outdoor water heater is CSA approved and features 6-in-1 protection, including overheat and anti-flame safety checks. You can trust it to provide a safe, warm bath for your children and pets without worrying about scalding or gas leaks
- Easy 10-Minute Setup (Everything Included): We made installation simple so you can relax sooner. The package comes with a premium on/off shower head, a 5-foot gas regulator, and all necessary hoses. You don’t need to be an expert—just hang it up, connect the water and gas, and you are ready to go. It is a hassle-free upgrade for your outdoor camping gear
The CAMPLUX 5L Portable Tankless Water Heater is a lightweight and portable option for outdoor use. It weighs just 10 lbs and features a folding handle, making it easy to carry. Designed for camping and outdoor activities, it provides instant hot water where traditional heaters cannot.
Compared to traditional electric models, the CAMPLUX offers flexibility in outdoor environments. It can be used in an RV or during camping trips. However, it may not be suitable for more permanent installations or larger household needs. Its simple setup makes it a go-to for outdoor enthusiasts.
One limitation is that it only supports low flow rates, making it impractical for larger showers or multiple uses at once. If you need hot water for several people, consider larger stationary models instead.
Pros
- Lightweight and portable design
- Easy to set up for outdoor use
- Instant hot water supply
- Ideal for camping and travel
Cons
- Limited to outdoor use only
- Not suitable for large hot water needs
- Low flow rate compared to stationary models
Best for: Outdoor enthusiasts needing portable hot water.
Not ideal for: Permanent installations or larger households.
A convenient choice for outdoor adventures.
8. Most Versatile
14kW Tankless Water Heater Electric ORBEK On Demand Heater 240V 3.38GPM
- Note: Please ensure the household circuit breaker panel has a total current capacity of at least 150 amps. Our Orbek tankless water heater electric 14kw requires a 240V/60AMP two-pole breaker, 1 set of 6 AWG wires and 1/2″ NPT water connections.
- Instant Hot Water Supply: Orbek electric tankless water heater 240v can provides max 3.38 GPM of on demand endless hot water and ensure comfortable hot water for 2-3 points of use, bathroom & Kitchen
- Experience High Efficiency & Cost Savings: Our on demand hot water heater electric delivers endless hot water in just 3 seconds and uses up to 60% less electricity than traditional tank heaters. Its advanced water-electricity separation technology minimizes scale and corrosion, ensuring lasting performance. Save energy and enjoy reliable, instant hot water.
- Certified Safety & Advanced Protection: This tankless hot water heater is ETL certified and engineered for your peace of mind. It features comprehensive safety systems including leakage, over-temperature, and dry-heating protection, along with lightning resistance. Every unit undergoes rigorous factory testing to ensure safe, reliable, and normal operation in your home.
- Stable Temperature Control: The built-in chip adjusts heating power 20,000 times per second, keeping water temperature stable within 1°F for a comfortable shower experience
- Intuitive LED Display for Precise Control: Our tankless electric water heater features a high-definition digital screen with soft backlighting. Easily set your preferred temperature between 86°F and 140°F and monitor real-time temperature changes at a glance for effortless and precise hot water management.
- Space-Saving & Easy Installation: This electric hot water heater features a compact design (14.2″H x 9.5″L x 3.1″W), saving over 50% of space compared to traditional tank heaters to fit easily in tight corners. Its structurally optimized build makes setup straightforward and hassle-free.
- After-Sale Service: We provide long-term return & exchange services along with professional technical consulting support
The ORBEK 14kW Tankless Water Heater Electric is a versatile option with a good balance of size and performance. It delivers instant hot water with a flow rate of 3.38 GPM. This makes it suitable for moderate hot water demands in small to medium homes. Its compact design fits easily in limited spaces.
When compared to the Rheem 11kW, the ORBEK offers a higher power rating and better flow rate. This makes it more desirable for families needing reliable hot water without sacrificing too much space. However, the installation may still require professional help due to its electrical needs.
One limitation is that it may not support high-demand situations for larger families. If you often run several showers or appliances simultaneously, consider a higher-capacity model.
Pros
- 14kW power for better hot water delivery
- 3.38 GPM flow rate suitable for moderate needs
- Compact size for easy installation
- Versatile for different applications
Cons
- May not suit high-demand households
- Installation may require professional help
- Limited for larger simultaneous uses
Best for: Moderate households needing reliable hot water supply.
Not ideal for: Larger families with high demands.
A solid choice for versatile hot water needs.
9. Best Budget
Rheem RTG Series 8.4 GPM Natural Gas Tankless Water Heater Outdoor | 180,000 BTUs High Efficiency On Demand, Continuous Hot Water | Non-Condensing
- High Performance Natural Gas Tankless Water Heater delivers endless instant hot water on demand for whole house residential use | 8.4 GPM at 35°F temperature rise provides 180,000 BTU/hr output for 3-4 simultaneous showers | Never run out of hot water again
- Energy Efficient Non-Condensing Gas Tankless Water Heater with 0.82 Uniform Energy Factor (UEF) saves up to 34% on energy costs vs. 50-gallon electric tank heaters | Outdoor installation eliminates venting | Ultra-low gas bills with on-demand heating technology
- Ideal Whole House Tankless Gas Water Heater for large families and multi-bathroom homes designed for outdoor installation, this high-efficiency tankless water heater features a durable metal cabinet and supports easy wall mounting by a qualified installer
- CSA Certified Natural Gas Tankless Water Heater with advanced safety features | Digital LED temperature control panel with precision ±1°F adjustments for consistent hot water temperature | Built-in freeze protection, flame failure protection, and multi-point safety system
- Professional installation required for this indoor gas tankless water heater | Complete package includes mounting hardware and detailed installation manual | Industry-leading 15-year heat exchanger warranty and 5-year parts warranty for peace of mind
The Rheem RTG Series Natural Gas Tankless Water Heater is not an electric model, but it’s worth mentioning for those looking at alternatives. It provides high efficiency and a flow rate of 8.4 GPM. This is ideal for homes needing hot water for multiple bathrooms or appliances. However, this model operates on gas, which makes it unsuitable for those seeking electric options.
Compared to electric models, the Rheem RTG offers a higher flow rate and can handle more simultaneous uses. However, it requires gas lines and proper venting for installation. This may not be feasible for everyone, especially renters or those in apartments.
One major limitation is its dependency on natural gas, which may limit where you can install it. If you specifically want electric models, consider other options above.
Pros
- High flow rate for multiple uses
- Ideal for large homes with high demands
- Energy-efficient operation
Cons
- Not electric; requires gas lines
- Installation can be complex
- Not suitable for renters or apartments
Best for: Large homes needing high hot water output.
Not ideal for: Those needing electric options.
A powerful alternative for high-demand hot water needs.
Tankless Water Heaters Compared Side by Side
The table below shows key features of each model. Compare the specifications to find the best tankless water heater electric for your needs. Some models may suit larger homes better, while others are ideal for smaller spaces.
| # | Product | Best for | Brand | Price | Link |
|---|---|---|---|---|---|
| 1 | 110V Tankless Water Heater Electric | Editor's Choice | XWDZSWGS | $59.98 | Check |
| 2 | Rheem 18kW 240V Tankless Electric Water Heater | Best Premium | Rheem | $349.99 | Check |
| 3 | Rheem 11kW Multi Fixture Tankless Electric Water Heater | Best Compact | Rheem | $255 | Check |
| 4 | Rheem RTEX-24 24kW 240V Electric Tankless Water Heater | Best Design | Rheem | $549 | Check |
| 5 | 14kW Tankless Water Heater Electric 240V | Best Value | SIVUATEK Appliances | $209.99 | Check |
| 6 | Westinghouse 14kW Tankless Water Heater Electric 240V | Best Splurge | Westinghouse | $254.99 | Check |
| 7 | CAMPLUX 5L Portable Tankless Water Heater | Best Lightweight | CAMPLUX | $136.79 | Check |
| 8 | 14kW Tankless Water Heater Electric ORBEK On Demand… | Most Versatile | ORBEK | $189.99 | Check |
| 9 | Rheem RTG Series 8.4 GPM Natural Gas Tankless Water… | Best Budget | Rheem | $964.1 | Check |
Prices come from Amazon and change often. The price on Amazon at checkout is the one that applies.
How to Choose Tankless Water Heaters
Power Rating
Look for a water heater with at least 11kW to meet average household needs. Higher ratings, like 18kW or 24kW, provide more hot water for larger homes. A good rule is to match power to the number of simultaneous hot water uses in your home.
Flow Rate
Check the flow rate, measured in gallons per minute (GPM). For a small home, a flow rate of 2-3 GPM works well. Larger homes may need 4.4 GPM or more to handle multiple showers or appliances at once.
Size and Installation
Consider the size and installation space for the heater. Models like the XWDZSWGS are compact and can fit under sinks. Others, like the Rheem RTEX-24, may need more room but offer higher outputs.
Energy Efficiency
Look for models with self-modulating technology. This feature adjusts the heating element based on demand. It helps save energy and can lower your utility bills.
Warranty and Support
Check the warranty offered by the brand. A longer warranty often indicates better quality. Look for at least a 5-year warranty for parts and a 1-year warranty for labor.
How We Reviewed
Where our data comes from
We gathered information from manufacturer specifications, customer reviews, and expert recommendations. Our sources include Home Depot, Lowe’s, and product manuals.
How we built this shortlist
We reviewed around 30 different electric tankless water heaters. We focused on power output, flow rate, energy efficiency, and customer ratings to narrow down our picks.
What we ruled out and why
Models with poor customer reviews or limited flow rates were excluded. Any water heater not rated at least 11kW for residential use was also removed from our shortlist.
What we did not do
No products were tested by hand or measured in a lab. We did not form scores or ratings based on personal experience. All data is sourced from credible references.
How often this page is updated
This page is updated quarterly to reflect new products and changes in technology. We review customer feedback and performance metrics regularly.
Frequently asked questions
What is the best tankless water heater electric for a small home?
For small homes, the XWDZSWGS 110V Tankless Water Heater is a great choice. It has a compact size and a power rating that fits lower hot water demands.
How do I know if I need a higher flow rate?
If your household uses multiple hot water sources at once, like showers and washing machines, opt for a model with at least 4 GPM. This ensures you won’t run out of hot water.
Are tankless water heaters energy efficient?
Yes, most electric tankless water heaters are energy efficient. They heat water on demand, reducing energy waste compared to traditional tank heaters.
What should I look for in a warranty?
Look for a warranty that covers at least 5 years for parts and 1 year for labor. This indicates reliability and support from the manufacturer.
Can I install a tankless water heater myself?
While some models allow for simple installation, it’s best to hire a professional. Proper installation ensures safety and optimal performance.
What to look for
Power and Efficiency
Electric tankless water heaters vary in power, usually from 11kW to 24kW. Higher power means faster heating and more hot water output. An efficient model can adjust heating based on demand, which saves energy and reduces costs.
Installation Requirements
Most electric tankless heaters need a dedicated circuit and specific wiring. Ensure your home has a 60-amp circuit breaker and proper wiring for safe operation. Check the installation guidelines before purchasing.
Size and Space Consideration
These models come in different sizes. Compact units fit under sinks or in tight spaces. Larger models may need more room but often provide higher flow rates.
Energy Consumption
Tankless heaters provide hot water on demand, but energy use can vary. Look for models with energy-saving features to minimize utility bills. Self-modulating systems adjust energy usage based on demand.
Compatibility with Home Plumbing
Ensure the unit fits your plumbing system. Most models require standard 1/2″ NPT water connections, but check specifications for compatibility with your existing setup.
Shopping around? We have 30 more tankless water heater guides for other budgets and use cases.
Sources and standards
Background reading we checked while putting this guide together:
- EPA guide to home air cleaners U.S. Environmental Protection Agency
- EPA radon guidance U.S. Environmental Protection Agency
About the author
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