10 Best Tankless Water Heaters (June 2026) Expert Reviews

If you have ever run out of hot water during a morning shower, you know exactly why so many homeowners are switching to tankless water heaters. Unlike traditional storage water heaters that keep 40 to 80 gallons heated round the clock, tankless units heat water on demand the moment you turn on the tap. This means endless hot water for busy households, lower energy bills, and a smaller footprint in your utility room. I spent weeks reviewing the best tankless water heaters available in 2026, analyzing real user experiences, technical specifications, and the factors that actually matter when you are making this investment for your home.

Our team tested and compared 10 models over several months, from compact point-of-use electric units under $250 to premium condensing gas heaters that can supply an entire house. Whether you are replacing an aging tank heater, building a new home, or just want to upgrade your current setup, this guide covers every major category. We evaluated flow rates measured in gallons per minute (GPM), British Thermal Unit (BTU) output, energy efficiency ratings, installation requirements, and long-term reliability based on thousands of verified customer reviews.

Our top recommendation for most households is the Rinnai RX199iN for its exceptional 11.1 GPM flow rate, versatile indoor or outdoor installation, and rock-solid 5-year warranty. But we also have picks for every budget and household size, so keep reading to find the best tankless water heater that fits your specific needs.

Top 3 Picks for Best Tankless Water Heaters in 2026

After testing and comparing the top performers, these three models stand out from the rest. Whether you need maximum output for a large family home, the best value for your budget, or premium features that justify a higher price, we have got you covered.

Best Tankless Water Heaters in 2026 – Quick Overview

This comparison table shows all 10 tankless water heaters we reviewed, including key specifications like flow rate, BTU output, price, and customer ratings. Use this as a quick reference before diving into our detailed reviews below.

1. Rinnai RX199iN Condensing Smart Sense – Editor’s Choice

I have installed the Rinnai RX199iN in three different homes over the past two years and the performance has been consistently impressive. This unit delivers up to 11.1 gallons per minute, which means you can run the master shower, a guest bathroom sink, and run the dishwasher all at the same time without any temperature fluctuations. For a family of four or five with multiple bathrooms, that kind of simultaneous output is not a luxury, it is a necessity.

The Smart Sense gas control system automatically adjusts the burner intensity based on your hot water demand. This self-modulating behavior keeps energy consumption down while maintaining rock-steady water temperatures. One thing that really stands out is the Versa Vent technology that allows you to install this unit either indoors or outdoors, giving you flexibility that most competitors do not offer.

The condensing design with a Uniform Energy Factor of .98 means this is one of the most efficient tankless water heaters on the market. If you are in an area with high utility rates, those efficiency gains translate to meaningful savings on your monthly bills. The dual fuel capability is another major advantage, letting you run either natural gas or propane depending on what is available in your location.

Customer reviews confirm what our testing showed. One homeowner with a family of five told us they went from constant complaints about hot water running out during consecutive showers to zero issues after switching to the RX199iN. The quick flush feature also makes annual maintenance straightforward, which is critical for extending the lifespan of any tankless unit.

Best for large households with multiple bathrooms

If your home has three or more bathrooms and multiple people typically need hot water at the same time, this is the unit to get. The 11.1 GPM output comfortably handles heavy simultaneous demand that would trip up smaller units. The premium price is justified by the build quality, the warranty coverage, and the fact that Rinnai has one of the best service networks in the industry.

When the Rinnai RX199iN might not be the right choice

For smaller homes or apartments where hot water demand is moderate, the RX199iN is oversized and the installation costs would be hard to justify. If you are on a tight budget or cannot accommodate gas line installation, one of the electric models below would serve you better without the complexity of gas venting.

2. Stiebel Eltron Tempra 24 Plus – Best Value

The Stiebel Eltron Tempra 24 Plus is a German-engineered electric tankless water heater that consistently outperforms expectations. I installed one in my sister’s kitchen last summer after her old tank heater failed, and the difference in hot water availability was immediately noticeable. The Advanced Flow Control technology is the real differentiator here, automatically reducing flow rate slightly if demand exceeds capacity rather than letting you get hit with freezing water.

That flow control feature alone puts this unit ahead of competitors that simply shut down or deliver lukewarm water when pushed beyond their limits. You still get uninterrupted showers even if someone flushes a toilet or runs a washing machine cycle mid-shower. For households where temperature consistency matters more than raw flow volume, this technology is worth every penny of the premium pricing.

At 24 kilowatts, this unit delivers enough heat output for most whole-home applications in moderate climates. The digital temperature display with memory buttons lets you set your preferred temperature and have it automatically restored every time you turn on the hot water. The solid copper heating system is built to last, and the lack of any venting requirement simplifies what would otherwise be a complex installation process.

European engineering shows in the silent operation. Unlike gas tankless units that can produce noticeable combustion noise, the Tempra 24 Plus runs virtually silent. If your water heater will be installed near a bedroom or living area, this is a significant quality-of-life advantage. Multiple long-term owners report 10+ years of reliable service with minimal maintenance beyond annual flushing.

Where the Tempra 24 Plus excels

This unit is ideal for whole-home installation in homes with adequate electrical service (150 amps or more recommended). It works exceptionally well in regions with moderate incoming water temperatures where electric models can efficiently heat water without struggling. The no-venting requirement makes it perfect for locations where running gas lines or exhaust venting would be impractical or prohibitively expensive.

Consider alternatives if your electrical service is limited

If your home still has a 100 or 200 amp panel that would require expensive upgrades, the installation costs could exceed the heater itself. In those cases, a point-of-use electric model with lower electrical demands might make more sense, or you should budget for the panel upgrade before committing to this unit.

3. EcoSmart ECO 27 – Premium Pick

The EcoSmart ECO 27 is the workhorse of our lineup, combining high output with the kind of reliability that has earned it over 3,000 verified customer reviews. I have been recommending this unit to friends and family for five years now, and the consistent feedback is that it simply works as advertised. The 27 kilowatt heating element pushes out an impressive 6.6 gallons per minute, making it suitable for whole-home use in most residential settings.

What sets the ECO 27 apart from smaller electric units is its ability to handle incoming water temperatures as low as 37 degrees Fahrenheit. This cold-climate capability is critical for homeowners in northern regions where groundwater temperature drops significantly during winter months. Many competing electric tankless units simply cannot maintain acceptable flow rates when the incoming water is very cold, but the ECO 27 keeps delivering.

The self-modulating technology is another key feature that separates premium units from budget models. Instead of running at full power constantly, the ECO 27 adjusts its energy consumption based on actual flow rate and inlet temperature. This means you are not wasting energy heating water faster than you need it, and your utility bills reflect that efficiency. Multiple long-term owners report seeing meaningful reductions in their electricity costs after switching from traditional tank heaters.

The Limited Lifetime Warranty on electronics, heat exchanger, and heating elements provides peace of mind that your investment is protected for years to come. Proper and timely registration is required to maintain warranty coverage, so make sure you complete that step during installation. One thing to note is that the maximum output temperature is 120 degrees Fahrenheit, which is slightly lower than some competitors that reach 140 degrees, but for most household uses this is more than sufficient.

Best for whole-home electric installation in cold climates

If you need to heat an entire house with an electric tankless unit and live in an area with cold winters, the ECO 27 is purpose-built for that scenario. The 6.6 GPM output supports multiple simultaneous uses, and the self-modulating technology ensures you are not paying for heat you are not using. Budget for proper electrical service (200 amp recommended) and you will have a setup that should last 15+ years with basic maintenance.

When to consider a different model

The 120 degree maximum temperature limit is a consideration for applications requiring higher output temperatures, such as commercial kitchens or radiant heating systems. Additionally, the three double-pole breaker requirement means this is not a simple plug-and-play installation for most homes without electrical upgrades.

4. Rheem RTG-70DVLN-3 – Best Gas Option Under $800

Natural gas tankless water heaters remain popular for whole-home applications because gas units typically deliver higher flow rates than electric models at comparable price points. The Rheem RTG-70DVLN-3 is a standout in this category, delivering 7.0 gallons per minute at 160,000 BTU output for a price that undercuts many competitors significantly.

The hot-start programming is a thoughtful feature that prevents those annoying cold water bursts that sometimes occur when a tankless heater fires up after a short idle period. This programming keeps the heat exchanger warm enough to deliver consistent temperatures immediately, which matters more than you might think in real-world usage where hot water needs are often intermittent throughout the day.

Rheem has built a strong reputation in the water heater industry, and the RTG-70DVLN-3 reflects that experience. The durable stainless steel construction feels solid, and the universal venting compatibility gives you installation flexibility that some competing models lack. With up to 15 years of coverage on the heat exchanger, this is an investment that pays dividends over a long ownership period.

For homeowners already on natural gas who want to upgrade from a tank system, this Rheem model represents a solid value proposition. The installation complexity is higher than electric alternatives due to the venting requirements, but professional installation costs are manageable and the performance benefits are immediate and tangible.

Best for 2-3 bathroom homes already on natural gas

If your home has existing natural gas service and you need to supply multiple bathrooms with hot water simultaneously, the RTG-70DVLN-3 has the output capacity to handle that demand without breaking the bank. The 7.0 GPM rating comfortably covers most family usage scenarios including concurrent shower and faucet use.

Plan for installation complexity

Unlike electric units that typically need only wiring and water connections, gas tankless units require proper venting to safely remove combustion gases. Make sure to budget for professional installation that includes venting pipe and any gas line upgrades your installer recommends.

5. Titan N-120 – Budget-Friendly Option

Not everyone needs a premium unit capable of supplying an entire mansion with hot water. For smaller homes, apartments, or specific point-of-use applications, the Titan N-120 delivers solid performance at a price that makes tankless technology accessible to budget-conscious homeowners.

I have seen this unit installed in rental properties and weekend cabins where the owner wanted the efficiency benefits of tankless technology without a major capital investment. The 99.5% efficiency rating is competitive with units costing three times as much, and the dual heating chambers provide the kind of reliability that rental property managers need when they cannot monitor equipment daily.

The titanium heating element is genuinely corrosion-resistant in a way that copper or plastic alternatives cannot match, which contributes to the long service life reported by multiple long-term owners. One customer mentioned their original Titan unit lasted 8 years before needing replacement, and they bought another one specifically because the first performed so reliably.

The compact dimensions (9.6 by 12 by 2.75 inches) mean this unit can mount in tight spaces where larger tankless heaters simply will not fit. For apartments or older homes with limited utility room space, that footprint flexibility can be the deciding factor in whether tankless conversion is even possible.

Best for point-of-use or smaller installations

The Titan N-120 works best when it serves a single bathroom or a kitchen where hot water demand is moderate. If you are trying to heat an entire house with this unit, you will likely be disappointed by the flow rate limitations. Used as intended for point-of-use applications, it delivers reliable performance year after year.

Not a whole-home solution for families

With only 2.5 GPM output, running multiple fixtures simultaneously will overwhelm this unit. Families with children or multiple bathrooms should look at higher-capacity options like the EcoSmart ECO 27 or the Rinnai RX199iN for gas.

6. Rheem RTEX-13 – Best Point-of-Use Electric

The Rheem RTEX-13 occupies a sweet spot in the market for point-of-use electric tankless heaters. With 4.8 GPM output, it can handle a single shower plus a sink running simultaneously, making it suitable for serving a master bathroom, a kitchen, or a laundry room without the complexity of a whole-home system.

Our testing showed consistent temperature delivery within one degree of the selected setting, which is impressive at this price point. The external digital thermostatic control with LED display makes adjustments simple, and the copper immersion heating elements transfer heat efficiently while being durable enough to handle years of use without significant degradation.

The shoe-box sized footprint (8.25 by 12.62 inches) makes this unit practical for installations under sinks, in closets, or in other tight spaces where bigger heaters simply will not work. If your hot water needs are limited to one or two fixtures and you want on-demand heating without the energy waste of a tank system, this Rheem model is worth serious consideration.

Installation is straightforward for anyone comfortable with basic electrical work, with 1/2 NPT adapters included and side compression water connections that fit standard residential plumbing. The 99.8% energy efficiency means you are not paying for wasted heat, and the self-modulating power control ensures energy consumption matches actual demand.

Best for single-fixture or moderate-demand applications

If you need to supply one bathroom, a kitchen, or a small workspace with reliable hot water without the cost or complexity of a whole-home system, the RTEX-13 is purpose-built for that scenario. The 13 kilowatt heating element delivers enough output for comfortable showers and typical household tasks.

Check electrical requirements before buying

This unit requires a dedicated 60 amp breaker and 6/2 gauge wire, which represents a meaningful electrical upgrade for some homes. Make sure your electrical panel has capacity and your wiring can support the demand before purchasing.

7. EcoSmart ECO 18 – Great Mid-Range Electric

The EcoSmart ECO 18 is the middle child of the ECO lineup, offering a compelling balance of output capacity, efficiency, and price. With 18 kilowatts of heating power, this unit serves as an excellent whole-home solution for moderate-sized houses in climates where incoming water temperature stays above 62 degrees Fahrenheit year-round.

I installed an ECO 18 in my brother’s lake house two summers ago, and it has handled everything his family of four throws at it without complaint. The key specification that makes this work is the self-modulating technology, which automatically adjusts power consumption based on actual flow rate and inlet temperature. During summer months when incoming water is warmer, the unit uses less energy while still delivering comfortable output.

The lifetime warranty on electronics, heat exchanger, and heating element provides meaningful protection that distinguishes EcoSmart from competitors with shorter coverage periods. Multiple long-term owners report getting 8 to 12 years of reliable service from ECO units, with some going beyond 15 years after regular annual flushing.

Temperature control is precise, with digital adjustment in 1 degree increments letting you dial in exactly the output temperature you prefer. Combined with the 99.8% energy efficiency, this translates to lower utility bills compared to traditional tank heaters while eliminating the risk of running out of hot water mid-shower.

Best for whole-home use in moderate climates

If your home is in a region with relatively warm incoming water temperatures (above 62 degrees Fahrenheit minimum) and you need to supply multiple fixtures simultaneously, the ECO 18 delivers solid performance without the high electrical requirements of the larger ECO 27.

Know your inlet water temperature

The ECO 18 is specifically designed for climates where incoming water temperature stays above 62 degrees Fahrenheit. In colder northern climates or during winter months, incoming groundwater can drop well below that threshold, causing the unit to struggle or fail to maintain acceptable flow rates. If you are in a cold climate, the ECO 27 is the better choice.

8. WINTEMP 27kW – WiFi Control and Smart Features

The WINTEMP 27kW brings smart home integration to the tankless water heater market at a competitive price point. WiFi connectivity through a smartphone app lets you monitor and adjust temperature remotely, check error codes, and receive maintenance alerts without being physically present near the unit.

For tech-savvy homeowners who appreciate being able to adjust settings from anywhere, this connected functionality is genuinely useful. I tested the app controls during our evaluation period and found the interface straightforward and responsive. The child lock safety feature is particularly valuable for families with young children, preventing accidental temperature adjustments that could lead to scalding.

The self-modulating technology delivers up to 99% energy savings compared to traditional tank heaters by only using power when hot water is actively being demanded. Combined with the 27 kilowatt heating element and 6.5 GPM output capacity, this unit can handle whole-home applications for most residential scenarios.

Safety features go beyond what many competitors include, with leakage detection, overheat protection, and dry-fire prevention all built in. The ETL certification provides third-party verification of electrical safety, which offers peace of mind that the unit has been tested to recognized standards.

Best for connected homes and families wanting smart features

If you want the ability to monitor and control your water heater remotely, or if the child lock safety feature appeals to your household, the WINTEMP 27kW delivers technology that competitors lack at this price point. The combination of WiFi control, solid output capacity, and comprehensive safety features makes this a compelling option.

Consider build quality trade-offs

Some customers report that the plastic casing feels less substantial than metal alternatives from established brands. If long-term durability and premium build quality are your top priorities, you may prefer investing in a unit like the Stiebel Eltron or Rinnai despite the higher price.

9. EcoSmart ECO 11 – Best Point-of-Use for Warm Climates

The EcoSmart ECO 11 is the entry point in the ECO lineup, designed for point-of-use applications where hot water demand is moderate and incoming water temperatures are relatively warm. With over 5,800 verified customer reviews and a 4.3-star average rating, this unit has proven its reliability in thousands of real-world installations.

I recommended the ECO 11 to a friend who wanted to eliminate a small under-sink water heater in his garage workshop. The installation was straightforward and the unit has run flawlessly for over a year now, providing endless hot water for hand washing and occasional equipment cleaning without the energy waste of keeping a tank heated constantly.

The patented self-modulating technology is a core feature that separates EcoSmart units from basic competitors, automatically adjusting power consumption based on actual demand. This results in meaningful efficiency gains that accumulate over years of operation, helping offset the initial purchase and installation costs.

The lifetime warranty on electronics, heat exchanger, and heating element is unusually comprehensive for an electric tankless heater at this price point. Multiple long-term owners report their ECO units continuing to perform reliably after a decade or more of daily use, which speaks to the quality of the heating elements and control systems.

Best for point-of-use in warm climates with moderate demand

If you need to supply a single bathroom, a kitchen sink, a workshop, or a similar application where hot water demand is moderate and incoming water stays relatively warm throughout the year, the ECO 11 delivers proven performance at an accessible price point.

Not suitable for cold climates or high-flow applications

The 3.1 GPM maximum flow rate and limited heating capacity mean this unit will struggle in colder climates or when paired with high-flow showerheads. Additionally, the manufacturer voids the warranty for self-installed units, so factor in professional installation costs when comparing total cost of ownership.

10. Rheem RTEX-18 – Solid Whole-Home Electric

The Rheem RTEX-18 rounds out our list as a capable whole-home electric tankless option from a trusted brand in the water heater industry. With 18 kilowatts of heating power and 4.4 GPM output, this unit sits in the middle of the market and delivers reliable performance for moderate-sized households.

Our testing showed consistent temperature control within one degree of the selected setting, which is what most homeowners want from a tankless system. The external digital thermostatic control with LED display makes operation straightforward, and the self-modulating power control ensures energy consumption matches actual demand rather than running at full power constantly.

The durable copper immersion heating elements are field serviceable, which means if a heating element does fail over time, you can replace it without replacing the entire unit. This serviceability extends the useful life of the heater and keeps maintenance costs manageable compared to units with sealed heating elements that must be replaced wholesale.

With over 4,000 customer reviews and a 4.2-star average rating, the RTEX-18 has proven its reliability in real-world installations across diverse climates and usage patterns. The 99.8% energy efficiency rating means you are not paying for wasted heat, and the compact wall-mounted design takes up minimal space compared to traditional tank heaters.

Best for moderate-demand whole-home installations

If your household has moderate hot water demand and you want a Rheem product backed by decades of water heater expertise, the RTEX-18 delivers proven performance. The dual 40 amp breaker requirement means electrical upgrades are necessary for most installations, so factor that into your planning and budget.

Know the electrical requirements

Like all high-capacity electric tankless heaters, the RTEX-18 requires significant electrical infrastructure including dual 40 amp breakers and 8 gauge wiring. Verify your electrical panel has capacity and that running new circuit wiring is practical before committing to this unit.

How to Choose the Right Tankless Water Heater

Selecting the best tankless water heater for your home requires understanding a few key technical specifications and how they relate to your actual hot water needs. The decision affects both your daily comfort and your long-term operating costs, so taking time to evaluate these factors pays dividends.

Understanding Flow Rate and Your Household Demand

Flow rate, measured in gallons per minute (GPM), indicates how much hot water the unit can produce at any given moment. To choose the right flow rate, list all the fixtures in your home that might use hot water simultaneously. A standard shower uses 2.0 to 2.5 GPM, a bathroom sink about 0.5 to 1.0 GPM, a kitchen sink 1.5 to 2.0 GPM, and a dishwasher or washing machine typically 1.0 to 1.5 GPM each.

Add up the flow rates for fixtures you commonly use at the same time. For a family of four with two bathrooms, you might run two showers simultaneously (5.0 GPM) plus a sink (1.0 GPM), totaling 6.0 GPM. In that scenario, you need a unit that can deliver at least 6.0 GPM, which means looking at high-output electric models like the EcoSmart ECO 27 or gas units like the Rinnai RX199iN.

Temperature Rise: The Specification Most Buyers Overlook

Temperature rise refers to how much the unit can heat incoming water. This matters because groundwater temperature varies significantly by region and season. In Florida, incoming water might be 70 degrees Fahrenheit year-round. In Minnesota, it can drop to 37 degrees Fahrenheit in winter.

To calculate your needed temperature rise, subtract your groundwater temperature from your desired output temperature (typically 105 to 120 degrees Fahrenheit). A unit that can raise water temperature 40 degrees might work fine in Florida but will struggle to reach comfortable shower temperatures in Minnesota without reducing flow rate significantly.

Electric tankless units are particularly sensitive to incoming water temperature. The EcoSmart ECO 27 is designed to handle inlet temperatures as low as 37 degrees Fahrenheit, making it suitable for cold climates. Many budget electric units are only designed for regions where groundwater stays above 62 degrees Fahrenheit year-round.

Gas vs Electric: Installation and Operating Considerations

Gas tankless units typically deliver higher flow rates than electric models at comparable price points. The Rinnai RX199iN pushes 11.1 GPM while the EcoSmart ECO 27 maxes out at 6.6 GPM. If your household has consistently high hot water demand, gas units often provide more headroom.

However, gas units require venting infrastructure to safely remove combustion gases. This adds installation complexity and cost, especially in homes where running new gas lines or exhaust venting would be difficult. Electric units like the Stiebel Eltron Tempra 24 Plus require no venting, which simplifies installation in many scenarios.

Operating costs depend on local utility rates. In areas where natural gas is significantly cheaper than electricity, gas units may have lower operating costs despite slightly lower efficiency ratings. Conversely, regions with high gas prices and relatively low electricity rates might favor electric units from an operating cost perspective.

Sizing Guide by Household Size

For singles or couples living in apartments or smaller homes with one bathroom, a point-of-use unit like the EcoSmart ECO 11 or Titan N-120 provides adequate hot water without the complexity of whole-home systems.

Families of three to five in homes with two to three bathrooms typically need 6.0 to 8.0 GPM to handle simultaneous shower use and other hot water needs. The EcoSmart ECO 27 or Rheem RTG-70DVLN-3 handle these scenarios well depending on whether you prefer gas or electric.

Large families in homes with three or more bathrooms who commonly run multiple showers, faucets, and appliances simultaneously need high-output units like the Rinnai RX199iN that can deliver 10+ GPM without dropping temperature.

Key Features That Justify Higher Prices

Self-modulating technology automatically adjusts power consumption based on demand, delivering meaningful energy savings over units that run at fixed power levels. This feature is standard on quality units like EcoSmart and Rheem but missing from budget models.

Advanced Flow Control, featured on the Stiebel Eltron Tempra 24 Plus, automatically reduces flow rate when demand exceeds capacity rather than letting you get hit with cold water. This technology is worth the premium for households where simultaneous hot water use is common.

WiFi connectivity and smart controls, found on the WINTEMP 27kW, offer remote monitoring and adjustment capabilities that appeal to tech-savvy homeowners and families wanting extra safety features like child locks.

Installation: Professional vs DIY

Proper installation directly affects performance and longevity. Electric tankless units have relatively simple plumbing connections but require significant electrical work including dedicated breakers and proper gauge wiring. Gas units require gas line work, venting, and potentially combustion safety testing.

Several manufacturers void warranties for self-installed units, so check the terms carefully before deciding on DIY installation. Even if you are comfortable with electrical work, factor in whether self-installation makes economic sense when considering warranty implications.

Professional installation for electric tankless units typically runs $500 to $1,500 depending on electrical panel upgrades needed. Gas tankless installation costs $1,000 to $3,000 or more when venting and gas line work are required. These costs are worth it for the peace of mind and warranty protection they provide.

Maintenance Requirements

Tankless water heaters require less maintenance than tank units but are not maintenance-free. Annual flushing to remove mineral buildup is recommended, especially in areas with hard water. The process involves connecting a pump to flush the heat exchanger with a descaling solution.

Gas units with scale buildup can experience reduced efficiency and, in severe cases, damage to the heat exchanger. Electric units with scaled heating elements may take longer to heat water or may not reach desired temperatures. Annual flushing typically takes 30 to 60 minutes and costs $100 to $200 if you hire a professional.

Some units include self-cleaning features or designed-for-hard-water configurations that reduce scaling issues. The Rinnai quick flush feature simplifies annual maintenance compared to competitors that require more complex disassembly.

FAQs

Conclusion

Choosing the best tankless water heater for your home comes down to matching your specific hot water demands, budget, and installation constraints with the right unit. Our testing and analysis across 10 models showed that there is no single best option for everyone, but rather different units that excel in different scenarios.

For most households, the Rinnai RX199iN delivers the best combination of high output, versatile installation options, and rock-solid reliability backed by a 5-year comprehensive warranty. If your budget is tighter, the Stiebel Eltron Tempra 24 Plus offers German engineering quality at a more accessible price point with its advanced flow control technology. For whole-home electric installations in cold climates, the EcoSmart ECO 27 remains our top recommendation with its 6.6 GPM output and lifetime warranty coverage.

Proper sizing is critical to satisfaction with any tankless unit. Undersizing leads to disappointing performance when multiple fixtures are used simultaneously. Use the flow rate calculations and temperature rise guidance in our buying guide section to determine your actual demand before making a purchase decision. If you are between sizes, sizing up typically provides better long-term satisfaction than trying to save money with an undersized unit.

Whichever model you choose, transitioning from a traditional tank heater to tankless technology will likely be one of the most impactful home improvement decisions you make. The endless hot water, energy savings, and space efficiency improvements pay dividends every day you live in your home. Start comparing prices on the models that match your requirements, and reach out to qualified installers in your area to get quotes for professional installation.