A tankless water
What is a Tankless Water Heater ?
Most people are used to water tanks, which can hold a large capacity of water, and usually use gas to heat that water all at once so that the home has hot water for sinks, dishwashers, baths, showers, and washing machines.
A tankless water
What are the Advantages of a Tankless Water Heater ?
Tankless water heaters have lots of advantages over water tanks, including:
- They are much more energy efficient
- They save money on your energy bill
- They take up less space, and some can even be installed outside
- They heat water much more quickly
- They can last up to twice as long as a water tank
heater
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Click here to get a FREE Cheat-SheatWhat are the Drawbacks of Tankless Water Heaters?
While they might seem like a perfect choice, given all of their advantages, there are a few disadvantages to consider before you make a decision, including:
- Tankless water heaters can be significantly more expensive
- They may also be more expensive to install – especially if you are replacing a water tank
- They may have a lower water output, so your shower may be a little chilly if you are also doing laundry
- Cheaper or smaller tankless water heaters may not be best for very cold climates
At the same time, if you get a better quality tankless water
What tankless water heater is best for me?
There are a few basic types of tankless water heaters, including indoor and outdoor, propane, natural gas, and electric heating, and different sizes – specifically in reference to how much water, in GPM (gallons per minute), they can heat.
There is also what is called a “point of use” tankless water
Our reviews and recommendations come from our own experience, the experiences and feedback of our friends and colleagues, and the reviews and experiences of actual verified customers.
After these reviews, we will give some advice on how to choose a tankless water
Once you have done that, you can feel confident that the corresponding unit in our buyer’s guide – Best Tankless Water Heaters: A-Z Guide – will offer the best performance, value and reliability you can possibly get.
Best Large Propane: Rinnai RU199EP Propane Tankless Water Heater
Rinnai is a company that shows up on our various buyer’s guides more than almost any other. While their products are not the least expensive, they offer levels of material quality, craftsmanship, reliability and performance that make any Rinnai product quite possibly the best investment you will ever make for your home.
And this Rinnai RU199EP large output propane tankless water
It is a whole house tankless water
With a maximum 199,000 BTU heating power, this Rinnai tankless water
Rinnai is an acknowledged leader in heating technology and innovation, and their ThermaCirc360 feature is a great example. It allows the RU199EP to circulate hot water through your house, making sure than even the most distant showers, appliances or sinks have instant hot water and saving you up to 1,100 gallons of water a year!
The Rinnai RU199EP is one of the most energy-efficient tankless water heaters available, with an energy efficiency rating of up to .96 and Energy Star certification. Features like their innovative Dual Heat Exchangers only add to its energy efficiency.
And the RU199EP is a Smart Appliance, meaning it is WiFi compatible and can be monitored and controlled via your phone, tablet or computer.
With the most advanced technology, the most useful features and the best quality available, the Rinnai RU199EP is our choice for best large propane tankless water
Features & Specifications
- Tankless Propane Water Heater
- BTU Range: 15,000 – 199,000
- Flow Rate: 11 Gallons a Minute
- Energy Factor: Up To .96 (Uniform Energy Factor .93)
- Energy Star and Energy Guide Certified
- WiFi Smart Technology
- ThermaCirc360
- Dual Heat Exchangers
- Warranty: 10 Years Heat Exchanger; 5 Years Parts; 1 Year Labor
Best Large Natural Gas Tankless Water Heater : Rinnai RU199EN Natural Gas Tankless Water Heater
For the second unit in our list of best tankless water heaters in 2023, we are right back with Rinnai, one of the finest and most innovative companies we have ever encountered.
This time we are looking at the Rinnai RU199EN large output natural gas tankless water, which like the propane version reviewed just above, is also from Rinnai’s top line up Super High-Efficiency Plus series.
It too is a whole house tankless water
With specs like these, this Rinnai tankless water
Rinnai is the acknowledged leader in heating technology and innovation, and their ThermaCirc360 feature is a great example. It allows the RU199EN to circulate hot water through your house, making sure than even the most distant showers, appliances or sinks have instant hot water and saving you up to 1,100 gallons of water a year!
The Rinnai RU199EN is one of the most energy-efficient tankless water heaters available, with an energy efficiency rating of up to .96 and Energy Star certification. Features like their innovative Dual Heat Exchangers only add to its energy efficiency.
And the RU199EN is a Smart Appliance, meaning it is WiFi compatible and can be monitored and controlled via your phone, tablet or computer.
Another brilliant product from the leaders in technology, dependability, performance and customer service, the Rinnai RU199EN is our choice for best large natural gas tankless water
Features & Specifications
- Tankless Natural Gas Water Heater
- BTU Range: 15,000 – 199,000
- Flow Rate: 11 Gallons a Minute
- Energy Factor: Up To .96 (Uniform Energy Factor .93)
- Energy Star and Energy Guide Certified
- WiFi Smart Technology
- ThermaCirc360
- Dual Heat Exchangers
- Warranty: 10 Years Heat Exchanger; 5 Years Parts; 1 Year Labor
Best Large Electric Tankless Water Heater : Stiebel Eltron Tempra 36 Plus Electric Tankless Water Heater
An electric water
While it does not have the extremely high volume of hot water offered by the propane and natural gas heaters above, it should have plenty for even larger homes and families, and even in colder temperatures, the Stiebel Tempra can handle multiple demands at the same time.
Stiebel’s patented Advanced Flow Control means the water will never run cold, and their Variable Flow technology ensures steady temperature even when demand suddenly increases.
These are just some of the many technologies and advanced features you find in a Stiebel Eltron product. The Tempra 36 is engineered and manufactured in Germany and offers a level of quality in materials and construction rarely found in any modern appliance – not to mention one of the best warranties on the market.
Any tankless water
That said, the Stiebel Tempra 36 Plus is substantially less expensive than the gas heaters listed above, and as a result, much, if not all, of that cost, will be offset. And it offers not just the best quality of any electric
Stiebel Eltron has a slogan that is right to the point: “Simply the Best.” We couldn’t agree more, and especially the Stiebel Eltron Tempra 36 Plus tankless electric water
Features & Specifications
- Tankless Electric Water Heater
- Maximum Temperature Increase: 55 Degrees Fahrenheit
- Flow Rate: Up To 7.5 Gallons a Minute
- Self-Modulating Energy Technology
- Advanced Flow Control
- All Copper Internal Tanks and Tubing
- Made in Germany
- Warranty: 7 Years Water Tank; 3 Year Parts
Best Medium Propane Tankless Water Heater : Rinnai RL75IP Natural Gas Tankless Water Heater
At the risk of sounding like a broken record, in our buyer’s guide and review of best tankless water heaters on the market today we go again to Rinnai for both our Propane and Natural Gas tankless water heaters for medium to small homes.
Rinnai is clearly the best company we know, and offers the best products in their field – they have, after all, been doing this for over a hundred years, and have been innovating and improving the whole time.
The Rinnai RL75IP is a smaller output tankless water
Meant for indoor installation, the Rinnai RL75IP is surprisingly small and will take up hardly any space, and with advanced Circ-Logic recirculating capabilities and a high energy efficiency rating of 0.82, it is one of the most energy-efficient propane tankless water heaters on the market and will save you plenty of money as well – as compared to a traditional tank
And the RL75IP is a Smart Appliance, meaning it is WiFi compatible and can be monitored and controlled via your phone, tablet or computer.
If you know the tankless water
We do know the market, and we have tried lots of their products, as well as lots from many other manufacturers, and we have no doubt whatsoever that the Rinnai RL75IP Propane Tankless Water
Features & Specifications
- Tankless Propane Water Heater
- BTU Range: 10,300 – 180,000
- Flow Rate: 7.5 Gallons a Minute
- Energy Factor: .82 (Uniform Energy Factor .81)
- WiFi Smart Technology
- Circ-Logic Water Circulation
- Warranty: 10 Years Heat Exchanger; 5 Years Parts; 1 Year Labor
Best Medium Natural Gas Tankless Heater : Rinnai RL75IN Natural Gas Tankless Water Heater
As mentioned just above, Rinnai is our strong choice for both our Propane and Natural Gas tankless water heaters for medium to small homes, not to mention large homes and families – an unprecedented 4 recommendations out of 7 total in our 2023 buyer’s guide and review of best tankless water heaters.
Rinnai is clearly the best company we know, and offers the best products in their field – they have, after all, been doing this for over a hundred years, and have been innovating and improving the whole time.
The Rinnai RL75IN is a smaller output tankless water
Meant for indoor installation, the Rinnai RL75IN is surprisingly small and will take up hardly any space, and with advanced Circ-Logic recirculating capabilities and a high energy efficiency rating of 0.82, it is one of the most energy-efficient natural gas tankless water heaters on the market and will save you plenty of money as well – as compared to a traditional tank
And the RL75IN is Smart Home ready, responding to voice command, compatible with your WiFi and able to be monitored and controlled via your phone, tablet or computer.
If you know the tankless water
We do know the market, and we have tried lots of their products, as well as lots from many other manufacturers, and we have no doubt whatsoever that the Rinnai RL75IN Natural Gas Tankless Water
Features & Specifications
- Tankless Natural Gas Water Heater
- BTU Range: 10,300 – 180,000
- Flow Rate: 7.5 Gallons a Minute
- Energy Factor: .82 (Uniform Energy Factor .81)
- WiFi Smart Technology
- Circ-Logic Water Circulation
- Warranty: 10 Years Heat Exchanger; 5 Years Parts; 1 Year Labor
Best Medium Electric Tankless Heater : Rheem RTEX-24 Electric Tankless Water Heater
It seems pretty simple to us. Even in this smaller range, a tankless water
As such, we see great wisdom in sticking with the most respected companies in the industry, established leaders in product quality, innovation and performance. This is why Rheem, along with Rinnai and Stiebel Eltron, is such a frequent recommendation in Know the Flo’s buyer’s guides and reviews and is represented in our 2023 list of the best tankless water heaters.
And for small to medium-sized homes, smaller families and milder climates, the Rheem RTEX electric tankless water
The Rheem RTEX-24 has the most advanced water modulation system on the market and will deliver consistently hot water even with rapidly changing demands. This system, along with an advanced digital thermostat, superior heating elements and many other factors lead to an impressive 99.8% energy efficiency rating.
The RTEX24 will provide up to 6 gallons a minute of hot water, and can increase water temperature by up to 65 degrees Fahrenheit – excellent performance for its price and class.
Meant for inside installation, this Rheem tankless electric water
There are few, if any, electric heaters that can match this one, in terms of performance and specifications, and even less that can offer the energy efficiency, the reliability and material quality, or the outstanding reputation that the RTEX24, or any Rheem product, has.
And, at its surprisingly low price, the Rheem RTEX-24 Electric Tankless Water
Features & Specifications
- Tankless Electric Water Heater
- Maximum Temperature Increase: 65 Degrees Fahrenheit
- Flow Rate: Up To 6 Gallons a Minute
- All Copper Immersion Chamber with Brass Fittings
- Digital Temperature Display and Thermostat
- Advanced Water Modulation System
- Warranty: 5 Years
Best Point of Use Tankless Water Heater : EcoSmart ECO 11 Electric Tankless Water Heater
If you don’t want to provide hot water for your whole house, but just in a single place – a shower, a sink or a washing machine, for example – a Point of Use tankless water
And the best one we’ve found is the EcoSmart ECO-11, a well-built unit that is ultra-simple to install and to use, with digital temperature control, precise energy management features and a limited lifetime warranty.
With a much lower water flow than any of the whole-house tankless water heaters above, the EcoSmart ECO11 can heat up to 2 gallons of water a minute, which is plenty for one or two sinks, a shower or other single-use applications. In fact, you can probably heat an entire bathroom’s water with this one
By allowing your larger water
A simple, high-quality unit that offers great performance and exceptional energy efficiency, and should offer many years of trouble-free service, the EcoSmart ECO 11 Electric Tankless Water
Features & Specifications
- Tankless Electric Point of Use Water Heater
- Flow Rate: Up To 2 Gallons a Minute
- Digital Temperature Display and Thermostat
- Patented Self-Modulation Technology
- Warranty: Limited Lifetime
How do I Choose the Right Tankless Water Heater ?
If you are building a house, planning a major renovation, replacing a broken water tank
But which tankless water
The brand and model are easy – the choices above represent the finest companies and the most advanced, high performance, reliable tankless water heaters on the market today.
All you have to do is decide how much hot water you need, click the corresponding link and you will have the best unit possible delivered to your home.
How Much Hot Water Do I Need?
This is determined with a simple GPM (gallons per minute) calculation, using the following guidelines:
- A sink faucet will use around .5 GPM of hot water.
- A dishwasher will use around 1.0 GPM of hot water.
- A clothes washer will use around 2.0 GPM of hot water.
- A shower will use around 2.5 GPM of hot water.
- A bathtub will use around 4.0 GPM of hot water to fill (but, of course, you can fill it more slowly).
If you have an idea of how many of these items you may be using at the same time – that is, will more than one person be taking a shower at once, or will you have the shower, clothes washer, and dishwasher running simultaneously – then you can get an idea of the maximum GPM of hot water your new tankless water
- Our large tankless water heaters provide 7.5 to 11 GPM of hot water.
- Our medium tankless water heaters provide 6 to 7.5 GPM of hot water.
Regardless of your use, you probably don’t want less than 6 GPM for a whole-house tankless water
Another way of figuring this out is based on the size of your family and your home.
- If you have a large house (2,500 square feet or larger), regardless of family size and use, you probably want a large tankless water
heater . - If your house is smaller than 2500 square feet, you are fine with a medium-sized
heater . - If you have 4 or more people in your family, excluding infants, you probably want a large tankless water
heater – even in a smaller house. - If you have 3 or fewer people, and a smaller house, again you should be fine with a medium-sized tankless water
heater .
Whatever you determine, it is good to remember that – while you never want to spend more money than necessary – you can’t go wrong getting a little more capacity than you need. So if you are unsure (or if you have children who are approaching their teens!) you might want to get a larger unit – it might even save you money in the long run.
Along those lines, our affiliate links will often lead you to the best prices you can get, but you might also notice that, for many of our recommendations, the Amazon page also has links leading to different-sized models of the same unit – offering more or less GPM of hot water.
The different models in the same line – especially with industry-leading brands like Rinnai, Stiebel Eltron, Rheem or that young upstart EcoSmart, will always be great choices and can be purchased with just as much confidence, and ultimately will provide just as much satisfaction, as our primary recommendations.
We hope that Know the Flo’s latest buyer’s guide – Best Tankless Water Heaters: A-Z Guide – has been a great help in your selection process and that you will turn to us again in the future!
Download this FREE cheat sheet to find 28 tricks that can help you save on your electricity and heating bill each month.
Click here to get a FREE Cheat-Sheat
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