Tankless water heaters are quickly replacing traditional tank models in many homes. They deliver endless hot water, compact design, and higher energy efficiency. But with so many brands on the market, how do you know which one is the best for your home?
We compared the most popular tankless water heater brands—Noritz, Navien, Rinnai, Takagi, and Rheem—plus insights from contractors and plumbers. Here’s a complete guide with pros, cons, and standout features.
What is a Tankless Water Heater?
A tankless water heater, also called an on-demand water heater, heats water only when needed. Unlike a traditional 40- or 50-gallon storage tank, these units use a heat exchanger to deliver hot water instantly. Benefits include:
- Unlimited hot water supply
- Longer lifespan (15–20+ years)
- Saves energy by avoiding standby heat loss
- Compact, wall-mounted design
Top Tankless Water Heater Brands in 2025
1. Noritz – Long Lifespan & Eco-Friendly
Highlights:
- Dual stainless steel heat exchangers for durability
- EZ models simplify installation
- Wi-Fi compatible options
Pros:
- Built for larger households
- Up to 20 years lifespan
- Strong safety features to prevent scalding
Cons:
- Gas only (no electric models)
- Limited availability outside supply houses
2. Navien – High-Tech & Energy Efficient
Highlights:
- Condensing and non-condensing models
- Built-in recirculation system in select units
- Stainless steel heat exchangers (more durable than copper)
Pros:
- Energy Star certified
- Faster hot water delivery
- Smart control app available
- Compact size, fits smaller spaces
Cons:
- Outdoor setups need additional venting kit
- Not always easy to buy in retail stores
3. Rinnai – Trusted & Widely Available
Highlights:
- One of the oldest and most recognized brands
- Available in major stores like Home Depot
- 15-year warranty on residential models
Pros:
- Excellent build quality
- Gas and propane options
- Compact size with Wi-Fi add-ons
Cons:
- No true electric models
- Some models underperform for large households
- Installation mistakes can reduce performance
4. Takagi – Affordable & Safety-Focused
Highlights:
- Wall-mount design saves space
- Designed with safety in mind (overheat cutoff, temperature control)
Pros:
- Cost-effective option
- Great for small to mid-size homes
- User-friendly controls
Cons:
- No Wi-Fi or smart features
- Struggles in colder climates
- Limited retail availability
5. Rheem – Affordable & Easy to Find
Highlights:
- Gas, propane, and electric tankless models
- Available nationwide at retailers
Pros:
- Budget-friendly choice
- Multiple fuel options
- Easy access to parts and service
Cons:
- Shorter warranty (1 year labor)
- Fewer advanced features
- Reliability can vary by model
Contractor Insights & Real-World Feedback
- Navien – Often praised by contractors for fewer maintenance issues and strong warranty support.
- Rinnai – Reliable, but requires professional installation to avoid problems.
- Takagi – Loved for affordability but not the best in harsh winters.
- Rheem – Popular for DIY buyers but may lack premium durability.
- Noritz – Best for long-term investment with eco-friendly features.
Tank vs. Tankless: Cost & Longevity
| Feature | Tank Heater (40 gal) | Tankless Heater |
|---|---|---|
| Lifespan | 8–10 years | 15–25 years |
| Size | Large, bulky | Compact, wall-mounted |
| Hot Water | Limited supply | Endless supply |
| Energy Use | Higher (standby heat loss) | Lower (on-demand heating) |
| Cost Installed | $1,500–$3,000 | $3,000–$6,000+ |
👉 Example: A Bradford White 40-gal tank heater costs ~$2k installed but may last only 5–8 years. A Navien NPE-240S2 tankless unit can last 20+ years, offsetting the higher upfront cost.
How to Choose the Right Brand
When comparing brands, consider:
- Household Size & Water Demand – Large families may need Navien or Noritz.
- Fuel Type – Gas, propane, or electric availability in your home.
- Budget – Rheem and Takagi are more affordable; Navien and Noritz cost more but last longer.
- Technology Needs – If you want Wi-Fi control and recirculation pumps, Navien is a top choice.
- Installation – Professional installation is recommended for all brands to maximize efficiency and warranty.
Final Verdict: Best Tankless Water Heater Brand in 2025
- Best Overall: Navien – durable, energy-efficient, advanced features.
- Best for Longevity: Noritz – 20+ year lifespan with eco-friendly design.
- Best Budget Option: Rheem – affordable and widely available.
- Best for Small Homes: Takagi – compact and reliable for light use.
- Most Trusted Brand: Rinnai – proven track record with nationwide availability.
Frequently Asked Questions (FAQ)
1. Which tankless water heater brand lasts the longest?
Noritz and Navien typically last the longest, with lifespans of 20+ years when properly maintained. Their use of stainless steel heat exchangers helps resist corrosion better than copper.
2. What is better: Navien or Rinnai?
- Navien offers advanced features like built-in recirculation pumps, Wi-Fi control, and stainless steel heat exchangers.
- Rinnai is more widely available in retail stores and is known for reliability but lacks some of Navien’s premium features.
👉 If you want cutting-edge technology, choose Navien. If you want easy availability and trusted performance, choose Rinnai.
3. Are tankless water heaters worth it?
Yes. Tankless water heaters save energy, provide endless hot water, and last twice as long as traditional tank models. While the upfront cost is higher, the long-term savings and reliability make them a smart investment.
4. How much does it cost to install a tankless water heater?
Professional installation typically ranges from $3,000–$6,000, depending on brand, unit size, and labor. Gas models usually cost more to install due to venting and gas line requirements.
5. Which is the most affordable tankless water heater brand?
Rheem and Takagi are the most budget-friendly. They cost less upfront and are easier to find in retail stores. However, they may not have the same lifespan or premium features as Navien or Noritz.
6. Do tankless water heaters require maintenance?
Yes. Annual flushing with vinegar or a cleaning solution is recommended to remove mineral buildup. This simple process keeps your unit efficient and extends its lifespan.
7. Can a tankless water heater supply hot water to the whole house?
Yes, but it depends on the flow rate (GPM) of the unit and the size of your household. Larger families or homes with multiple bathrooms should choose higher-capacity models like Navien NPE series or Noritz EZ series.
Conclusion
Choosing the right tankless water heater brand depends on your budget, home size, and features you value most. If you want cutting-edge technology and durability, go for Navien or Noritz. For affordability, consider Rheem or Takagi. And if you want a trusted name with broad service availability, Rinnai is a safe bet.
Investing in a quality tankless water heater ensures endless hot water, lower energy bills, and long-term peace of mind.
