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Last update on 2024-09-20 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API
The best tankless water heater has become more and more popular in households; it helps control the temperature of water for the water system in your house. Obviously, nobody likes too cold or too hot touching feeling when you want to relax after a long day in the winter or summer. Therefore, the best tankless water heater is created to keep the temperature in control and give people the best enjoyment.
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No |
PRODUCT |
BEST FOR |
RATING |
DETAILS |
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1 |
ecosmart ECO 18 Electric Tankless Water Heater |
Best Seller |
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2 |
Rinnai V75iN Natural Gas Tankless Hot Water Heater |
Best Overall |
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3 |
Stiebel Eltron Tankless Water Heater |
Best For Off-grid Living |
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4 |
Rinnai V53DeP Propane |
Best For Large Homes |
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5 |
EcoSmart ECO 11 Electric Tankless Water Heater |
Best Budget |
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Depending on the outstanding feature of each product, we divide them into the 5 types of the best tankless water heaters.
1. Best small capacity
EcoSmart ECO 11 Electric Tankless Water Heater
Every EcoSmart ECO 11 tankless electric water heater delivers endless hot water, while at the same time-saving space, time, money, and allowing you to reduce your overall energy and water use. What is endless hot water? Different from the traditional water heater, the EcoSmart tankless electric water heater provides the amount of hot water on demand instead of using storage like the traditional one. It can provide between 1.3 and 3.1 gallons per minute depending on the inlet water temperature. Moreover, this tankless water heater has a small size and a light weight, making it easy to install without taking up too much space. With its digital temperature control, you can choose your desired temperature between 80 and 140 degrees Fahrenheit. This product is appropriate with EcoSmart criteria including saving energy, saving space, and saving time.
Specification:
- Item Weight: 6.5 pounds
- Product Dimensions: 3.75 x 8 x 11.5 inches
- Size: 12 x 8 x 4
- Style: ECO 11
- Color: White
Pros:
- All of the components are made out of copper or stainless steel to ensure durability.
- The compact size minimizes the amount of space the heater takes up.
- It uses technology that controls the unit’s energy output for optimal performance.
- The heater can be used for single or multiple applications.
- The unit can heat up to 2 gallons of water per minute.
Cons:
- The “point of use” design of this water heater is not ideal in all circumstances.
- The unit must be installed with a restrictor.
- In order for the lifetime warranty to be valid, the heater must be installed by a professional.
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2. Best medium capacity
EcoSmart ECO 18 Electric Tankless Water Heater
EcoSmart ECO 18 is an updated version of the ECO 11 water heater. So, apart from the basic features of Eco 11 having, the outstanding feature of the ECO 18 is that it has more capacity than ECO 11. The capacity of Eco 18 is up to 4.3 GPM that is enough to heat shower and sink simultaneously in warm climates. Moreover, the ECO 18 also has an affordable price, highly durable, easy to use, and lifetime warranty. Therefore, Eco 18 is the best option for customers with more than 3,000 high ratings on Amazon.
Specification:
- Item Weight: 14 pounds
- Product Dimensions: 3.63 x 14 x 17 inches
- Size: 17 x 14 x 3.5
- Color: White
- Style: ECO 18
Pros: Low cost to buy and operate.
Cons: Heating capacity can drop significantly in colder climates.
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3. Best indoor gas
Rinnai Tankless Hot Water Heater
This tankless water heater has a high flow rate of 7.5 GPM, which allows you to run several appliances, such as your dishwasher, washing machine, and shower, at once. Moreover, Control-R 2.0 mobile app features timers and schedules throughout the day and allows you to remotely put the system into vacation mode. The unit also comes with a mobile app that allows you to remotely control its settings. This tankless water heater uses gas instead of electricity for a higher flow rate. It’s installed inside to prevent cold temperatures from affecting its heating efficiency.
Specification:
- Item Weight: 45.6 pounds
- Product Dimensions: 14.04 x 9.27 x 26.9 inches
- Size: 7.5 GPM
- Style: Natural Gas
Pros: You can control the temperature and recirculation pump from your phone.
Cons: May lose Wi-Fi connection intermittently if located far from the router.
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4. Best electric flow rate
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus
Stiebel Eltron's top-rated Tempra whole house electric tankless water heater is a product from Germany and performs to the highest standards for comfort and reliability. With the Advanced Flow Control patented technology invented, the tankless water heater from Stiel Eltron house has automatically maintained water temperature to give the users comfort during use. Moreover, the small white sleek design is not only space-saving but also Moreover, the small white sleek design is not only space-saving but also luxurious space-making. Although this product is small, the amount of hot water in your house is endless. Besides, the eco-friendly unit saves energy with auto-modulation and the ability to electronically control water flow. The saving monitor shows how much you save on energy costs.. Furthermore, the Stiebel Eltron water heater has an easy operation with an electronic switch to activate it but does not make noise while in use. The best electronic water heater also has a digital temperature display, preset temperature, and memory buttons to help the operation become easier. Similar to other tankless water heaters, this product also has a large temperature range of 68–140 degrees Fahrenheit that allows you to choose between lukewarm, hot, and scalding hot water.
Specification:
- Item Weight: 1 pounds
- Product Dimensions: 4.63 x 16.63 x 14.5 inches
- Color: White
- Style: Tempra 24 Plus (24kW)
- Thickness: 1 pounds
Pros:
- Having a noise-free operation
- Doesn't take up a huge space.
- Easy to install and use.
- Allows to adjust the temperature in seconds and precisely.
- Provides saving on the electric bills.
- Corrosion-resistant.
Cons:
- Short warranty.
- Spend a lot of panel space and cost to upgrade the electrical panel.
- Lack of hot water for two showers and low performance (warm instead of hot water).
- Doesn't work so well if the incoming water is cold.
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5. Best outdoor gas
Rinnai Outdoor Tankless Hot Water Heater / V53DeP / Propane / 5.3 GPM
The same as other best tankless water heaters, the Rinnai Outdoor Tankless Hot Water Heater provides endless hot water for your whole home. Besides, as far as gas-powered water heaters go, this unit is relatively lightweight that makes the installation outdoors become easy. This gas-powered water heater is installed outside, making it be the best choice for families that have limited space inside or homeowners who don’t want to install ventilation with the water heater. It also has a medium flow rate for gas units at 5.3 GPM, and this unit can be changed depending on groundwater temp. Moreover, through Control-R 2.0 mobile app features, a remote can be controlled via Rinnai’s mobile app.
Specification:
- Item Weight: 33 pounds
- Gas Type: Propane
- Product Dimensions: 21.8 x 14.0 x 7.9 inches
- Domestic Hot Water Flow Rate (Maximum): 5.3 GPM / (20.1 l/min)
Pros:
- Comes with endless hot water
- It has high-efficiency ratings
- The product is light in weight
- 10 Years warranty on the heat exchanger
- It features a high water flow rate
Cons: The price is a bit high
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1. Budget
Buying criteria of the best tankless water heater depends on the budget of each family. So, how can you choose one tankless water heater for your house? Besides, the product has an affordable price requirement. Our best tankless water heaters can solve this budget problem. Our products fluctuate from $200 lower to $600 higher for one best tankless water heater. These price levels are affordable for every family.
2. Power source
There are 2 power source options including electric and gas. With the electric water heaters, the electric product will connect to your home’s electrical system. As water passes through the unit, a sensor in the heating element turns on the burner, and a thermostat starts working to get the water heated to your desired temperature. The cost of an electric water heater is more affordable than the cost of a gas-powered one, but it’s less efficient at heating the water that passes through it. On the other hand, gas-powered water heaters are more efficient and more expensive than an electric one. Moreover, gas-powered water heaters also allow them to heat enough water to run several appliances at once. They can be split into non-condensing and condensing based on whether they have one or two heat exchangers.
3. Flow rate
Choosing tankless water heaters depends on considering and calculating their GPM. We have the table of GPM below the product description to give you the exact parameter about changing the GPM following the temperature. However, as a whole, electric water heaters have a lower flow rate than non-condensing gas heaters, which have a lower flow rate than condensing gas heaters. When considering the flow rate you need, think about how many appliances you want to run at once and how much water those appliances require.
4. Outdoor or Indoor?
Outdoor water heaters will work well if you don’t have the space for one in your home or if you can’t install the ventilation needed for a gas-powered one. However, these outdoor water heaters aren’t as efficient in the winter months because they’re directly exposed to cold temperatures, forcing them to work harder to heat the water running through them. So, if you have more space for a tankless water heater, indoor water heaters will be the best choice for you.
5. Installation
Because most tankless water heaters have small sleek designs, therefore, the tankless water heater might be placed on the wall. However, as you know, the weight of an electric water heater is lighter than a gas-powered water heater, so, the electric water heaters are easier to install than gas one and have more space to install. If you want to use the electric water heater, you just need to connect the product with your electrical system and water pipes. If you want to install a gas-powered water heater inside, please take note that the gas-powered one will require ventilation to ensure that please take note that the gas-powered one will require ventilation to ensure that toxic air will not be stored indoors and negatively affect your life quality. Not only does this increase the installation cost and time, but it also limits where you can put the unit because you have to have space for the unit, vents, and ducts.
1. What is GPM? How can you calculate the GPM?
GPM means Gallons Per Minute. Also known as "flow rate", GPM is a measure of how many gallons of water flow out of your shower head each minute. For example, faucets require about 0.5 GPM, showers require 2.5 GPM, dishwashers require one GPM, and washing machines require 1.5 GPM. If you want to run your dishwasher while showering, your unit will need a flow rate of at least three GPM to keep up with demand.
2. Should you get a tankless water heater?
Of course yes. The main difference between tankless water heaters and hot water tanks is that tankless models only use energy when you turn on the tap. You aren’t paying to store a huge tank of water while you’re away at work or at night when you’re sleeping. Besides, the best tankless water heaters also have more advantages than tank water heaters. They have much lower-cost energy, many qualify for government rebates, get as much hot water as you can use, less chance of flooding should a breakdown occur, and a working lifespan that’s twice as long. These are the reasons why you should get a tankless water heater.
3. Will the tankless water heater still work if the power goes out?
As we introduce above, the electric water heater will connect directly with your house’s electric system, therefore, if the power suddenly goes out, electric heaters will still allow water to flow through them, but the heating function won’t work unless you have a battery backup. In contrast, the gas-powered water heaters don't connect with the electric system, so they’ll still work if you experience a power outage.
4. How long do the best tankless water heaters take to get the warm water?
The time to heat the water depends on the capacity and GPM of each tankless water heater. However, most of the best tankless will not take you more time to get warm water. This work has just taken within seconds.
5. How long does the warranty of the best tankless water heater last?
While the average conventional tank system typically lasts 10-15 years (and maintains efficiency for 10-12 years), a tankless system is expected to last at least 20 years. That lifespan can potentially be extended even further by replacing the heat exchanger rather than the whole unit.
To sum up, having the best tankless water heater in your house is very necessary. Both the old and the young like having a warm water flow for relaxing in the bathroom after a long day. We hope that these criteria and products will help you choose the best tankless water heater for your family. There are top 5 tankless water heaters such as EcoSmart ECO 11 Electric Tankless Water Heater, EcoSmart ECO 18 Electric Tankless Water Heater, Rinnai Tankless Hot Water Heater, Stiebel Eltron Tankless Water Heater – Tempra 24 Plus, and Rinnai Outdoor Tankless Hot Water Heater / V53DeP / Propane / 5.3 GPM.
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