Want endless hot water, energy savings, and a sleek, space-saving design? Electric tankless water heaters are a smart upgrade for any home, condo, or small business. They heat water instantly—no bulky tank, no wasted energy, and no waiting for the shower to warm up. But with so many options online, which electric tankless model really stands out? Here’s your complete, easy-to-read guide to the best electric tankless water heaters, how to choose the right one, and the pros and cons to know before you buy.
Quick Picks: Best Electric Tankless Water Heaters
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Best Overall:
EcoSmart ECO 18 Electric Tankless Water Heater – Superb for homes with 1-2 baths, delivers consistent hot water and unbeatable value. -
Best Budget:
Stiebel Eltron DHC Trend Point-of-Use Electric Tankless Water Heater – Compact, affordable, and perfect for single sinks, small bathrooms, or office kitchens. -
Best Premium:
Rheem RTEX-24 Electric Tankless Water Heater – High output, advanced digital controls, and ideal for larger homes or families who want hot water everywhere.
Buyer’s Guide: How to Choose the Best Electric Tankless Water Heater
Not sure which tankless model is right for you? Here are the top factors to consider before you buy:
- Power Output (kW): More power means faster heating and higher flow. Look for at least 18kW for whole-home use, 12-14kW for point-of-use or small apartments.
- Max Flow Rate (GPM): Gallons per minute is key. The best electric units provide 2.5–5 GPM, enough for showers and appliances at once. Smaller models serve single sinks or baths.
- Installation Requirements: Most models need 240V and one or two 40A breakers. Double-check your home’s electrical panel for capacity.
- Digital Controls & Display: Top heaters feature easy digital temperature controls for precise comfort.
- Warranty & Support: Long warranties and a strong reputation mean you’ll get help if something goes wrong.
- Size & Placement: Choose a compact model for under-sink installs or tight closets; go larger for multi-bath homes.
Detailed Reviews: Top Electric Tankless Water Heaters
EcoSmart ECO 18 Electric Tankless Water Heater
Who it’s for: Families, homeowners, and anyone wanting reliable whole-house hot water with minimal fuss.
Key Benefits:
- Self-modulating technology for maximum energy savings
- Compact design fits almost anywhere
- Digital temperature control—set your comfort down to the degree
- Supports 1–2 showers running at the same time
- Lifetime warranty for residential use
Pros:
- Trusted, best-selling brand
- Easy installation and maintenance
- Very efficient—cuts energy costs
Cons:
- Requires two 40A breakers and 8-gauge wiring
- Not suitable for colder climates with high demand
Final Verdict: The EcoSmart ECO 18 is a customer favorite, combining solid performance with real savings.
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Stiebel Eltron DHC Trend Point-of-Use Electric Tankless Water Heater
Who it’s for: Small households, guest bathrooms, offices, and RV owners who want reliable hot water at a single location.
Key Benefits:
- German engineering for durability and safety
- Super-compact size for tight installs
- Runs on standard 120V or 240V (model specific)
- Instant, endless hot water for one fixture
- Great for rental properties and remote sinks
Pros:
- Very affordable
- Reliable performance
- Low energy use—only heats when you need it
Cons:
- Single fixture only (not for showers plus appliances)
- Some installation may require hardwiring
Final Verdict: A perfect choice for anyone needing a dedicated hot water source without breaking the bank.
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Rheem RTEX-24 Electric Tankless Water Heater
Who it’s for: Larger families, multi-bath homes, or anyone who wants consistent hot water all day.
Key Benefits:
- Delivers up to 5.9 GPM—enough for two to three showers at once
- Advanced digital temperature controls and bright display
- Durable copper immersion heating elements
- Built for quick, professional installation
- Great support and warranty
Pros:
- High output for big homes
- Precise temperature adjustment
- Quiet, efficient operation
Cons:
- Needs two 60A breakers (adequate panel required)
- Professional install recommended
Final Verdict: When you need high capacity, the Rheem RTEX-24 delivers, day after day.
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Comparison Table
| Name | Key Features | Specs/Capacity | Price Link |
|---|---|---|---|
| EcoSmart ECO 18 | Self-modulating, digital control, lifetime warranty | 18kW, 2.5–4.3 GPM, two 40A breakers | View |
| Stiebel Eltron DHC Trend | Compact, single-sink, German quality | 3.0–8.0kW, up to 1.5 GPM, 120/240V models | View |
| Rheem RTEX-24 | High output, digital display, copper elements | 24kW, up to 5.9 GPM, two 60A breakers | View |
FAQ: Electric Tankless Water Heaters
- Can an electric tankless heater supply a whole house?
Yes—if you choose a high-output model and your home’s electrical panel can handle the load. - Do these models need maintenance?
Yes. Annual descaling or flushing is smart, especially in hard water areas. Clean inlet filters as well. - Are they hard to install?
Most require dedicated breakers and 240V wiring. If you’re not experienced, a professional installer is recommended. - What are the running costs?
Electric tankless heaters are highly efficient. You’ll only pay to heat water as you use it—no tank means no standby loss. - How long do these heaters last?
With basic care, most quality electric tankless water heaters provide 10–20 years of reliable service.
Conclusion
Upgrading to an electric tankless water heater is a simple way to enjoy endless hot water, cut your energy bills, and free up valuable space. Whether you’re after a high-capacity whole-house model or a compact point-of-use unit, these top picks deliver dependable results. Choose your favorite, enjoy quick installation, and relax with hot water whenever you want—no waiting, no worries.