Best Tankless Water Heater For Well Water in 2022 – BestHeaterGuide

Tankless water heaters are becoming very popular due to their highly efficient energy consumption, intelligent and elegant designs, and longer life span as well as for being environmentally friendly and saving you money, but they don’t work for everyone. If your home is on well water, you’ll need to make some special considerations before deciding if one is right for you.

The biggest consideration is that most tankless water heater models are not compatible with well water. This includes both traditional and tankless water heaters, which use gas or propane to generate hot water. If you have a well and want to install a tankless water heater, you will need to find a model that is specifically designed to use with wells. You also need to understand the water pressure and flow rate of your well in order to ensure that the tankless water heater you choose has the capacity to meet your needs. We will go over all that you need to know about it, in this article.

Quick Shopping tips for Best Tankless Water Heater For Well Water

Budget pick

EcoSmart ECO 27 is an electric unit that is highly affordable for being on most consumers’ budgets. Its several great features will make your life comfortable and peaceful. Its energy efficiency is 99.8%and its self-modulating technology allows you to save 50% of the energy cost compared to the tank water heater. Its dial control temperature settings provide ease of use and accurate temperature adjustment of 1 degree.

This unit utilizes copper and stainless steel components that are corrosion-resistant, increasing energy efficiency and broadening the unit’s life span.

Top pick

Rinnai RUR199iN is an extremely powerful gas-powered tankless water heater. It can provide up to 11 GPM of hot water with 93% of energy efficiency. The average service life of a Rinnai is 20-years, where its parts can be easily replaced and do not require expensive category III materials.

It has two heat exchangers, where the secondary heat exchanger heats the cold water to lukewarm and then the primary heat the lukewarm water into the desired temperature.

Staff pick

Stiebel Eltron Tempra 24 plus is the perfect combination of German engineering and beautiful design. It’s a medium-sized electric machine that can heat up to 3.6 gallons of water per minute at 45 degrees. It doesn’t require any unique installation. It is the most customer-friendly unit in the market with its easier and precise temperature controls.

It gives you a continuous stream of water, has quit working and modulates its operations to ensure more significant savings.

At a Glance:

Our recomendation for Top 8 Tankless water heater for well Water

These are the best tankless water heaters that work perfectly on well water.

AwardDesignTankless heater reviewsRetailer
Best buy tankless water heater well water
Staff Pick1. Stiebel Eltron tempra 24 plus
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Best electric tankless water heater well water
2. Rheem RTEX-24
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Best indoor tankless water heater well water
Best Pick3. Rinnai RUR199iN
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Best natural gas tankless water heater well water
4. Rheem RTG-95DVLN-2
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Best condensing tankless water heater well water
5. Takagi T-H3-DV-N Condensing tankless water heater
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Best budget tankless water heater well water
Budget Pick6. EcoSmart ECO 27
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Best tankless hot water heater well water
7. SIOGreen SIO 18
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Best 120V tankless water heater well water
8. Takagi T-KJr2
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1. Stiebel Eltron tempra 24 plus

Staff Pick

Best buy tankless water heater well water

Stiebel Eltron Tankless Water Heater
Stiebel Eltron Tankless Water Heater

Tempra 24 plus is a medium-size electric unit that works well with hard water. It has a capacity of 3.6 GPM of hot water at 45-degree. This unit is a combination of fine German engineering and beautiful design. Its advanced flow control will give you a consistent flow at times when your hot water demand is higher than expected.

We have selected Tempra 24 plus due to its modest requirement that it can easily fit into any household without much upgrade hassles. You can always go for a bigger or smaller model based on your hot water demand.

Moreover, It is one of the most customer-friendly units there is in the market. It has easier and precise temperature control, gives you a continuous stream of water, has quit working, and modulates its operations to ensure bigger savings.

Features

GPM and Temperature rise

Temperature Rise 37°F 54°F 73°F 92°F

Flow Rate 4.5 GPM 3.0 GPM 2.25 GPM 1.5 GPM

Noiseless working:

It is a quiet appliance that provides instantaneous hot water.

Advanced Flow Technology:

Its advanced flow technology controls the water flow so you can get continuous hot water. When you exceed its water heating capacity, it will automatically reduce the water flow coming to you to ensure you get the same hot water, although in a lower amount.

Warranty

It has 7 years Leakage Protection Warranty and 3 years of parts replacement warranty.

Certifications

UL and CSA certified. It also has lead-free compliance.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • The voltage demanded is 240V
  • The minimum flow rate for activation is 0.5 GPM
  • For normal operations, the water pressure should be 30-150 psi
  • Wattage consumption is 24000 Watts
  • Requires 2 Breakers 50A
  • Required 2 Wiring of 6 AWG
  • Water connection possible with 3/4″ NPT

Specifications

  • Color: White
  • Weight: 16.1 Pounds
  • Dimensions: 14.5 inches in height, 16.6 inches in width, and 4.6 in-depth

Pros

  • Durable copper and Stainless-Steel components
  • Inexpensive
  • Save 50% of the operational cost as energy saving

Cons

  • Not designed for the colder region
  • More expensive than its counterparts

Why you should buy this?

If you are looking for a medium-sized electric tankless hot water heater that is both durable and energy-efficient, then Stiebel Eltron Tempra 24 plus is a great option. It has many features that make it a top choice, especially its advanced flow technology that ensures a consistent flow of hot water even at a higher demand.


2. Rheem RTEX-24

Best electric tankless water heater well water

Rheem RTEX-24 Electric Tankless Water Heater
Rheem RTEX-24 Electric Tankless Water Heater

If you want a tankless electric water heater for your entire house, the Rheem RTEX-24 is a good choice. It has the capability of generating a flow rate of up to 5.9 GMP, but if you require a more powerful unit, there are a plethora of options available in the RTEX series to choose from.

Despite the fact that the RTEX-24 can handle up to three showers at once, the temperature for your region is critical for deciding it. If you get a device that is too little, you will be quite disappointed.

You’ll have a lot of installation options with the RTEX-24. Because it doesn’t require venting, you won’t have to tuck the unit out of sight thanks to its crisp, clean lines and attractive finish.

Features

1℉ Temperature Control

The electronic temperature control is simple to use and allows for a 1° change. The temperature can be regulated anywhere between 80 and 140 degrees Fahrenheit.

Copper heat exchanger

Three copper immersion heating components are threaded with a brass cap for easy repair and are also sturdy.

Self- modulation

The advanced self-modulation technology, with its 99.8% energy efficiency, saves a significant amount of energy by adjusting the power up or down to match the hot water demand.

Easy to Install

It is suggested that you get a professional to install your system. Electric water heaters are straightforward to install, and having it done by a professional will ensure that it’s done correctly.

GPM and Temperature rise

Temperature Rise 27° F 41° F 55° F 66° F 82° F

Flow rate 6.0 GPM 4.0 GPM 3.0 GPM 2.0 GPM 1.0 GPM

Warranty

The heat exchanger is warranted for five years, while the parts are warranted for one year.

Certifications

ETL, UL, and CSA certified

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Activation flow rate is 0.3 GPM
  • Breaker required: 3 x 40A
  • Water connection: ¾ in. NPT
  • Voltage: 240V
  • Recommended Wire Size: 8 AWG
  • Water pressure: 25-150 psi

Specifications

  • Color: Grey
  • Weight: 17.8 pounds
  • Dimensions: 17.62 inches in width, 18.25 inches in height, and 3.5 in-depth

Pros

  • 99.8% energy efficiency
  • Immersion heat exchanger made of copper
  • Working without making any noise
  • Installation is simpler
  • Inexpensive

Cons

  • In cooler weather, the output is reduced.
  • Installation by a professional is suggested.

Why you should buy this?

There are many reasons to buy the Rheem RTEX-24 tankless water heater. Perhaps the most compelling ones are its elegant design, inexpensiveness, and noiseless operation. Furthermore to install and give higher saving with its 99.8% energy efficiency.


3. Rinnai RUR199iN

Best Pick

Best indoor tankless water heater well water

Rinnai RU199iN RRU199iN, RU199in-Natural Gas/11 GPM
Rinnai RU199iN RRU199iN, RU199in-Natural Gas/11 GPM

Rinnai’s RUR199iN tankless water heater is a strong gas tankless water heater. It has all of the features you’d expect from a high-end model, including the ability to generate up to 11 GPM of hot water. It’s also a direct and upgraded successor of the RUR98iN.

It’s difficult to go wrong with Rinnai, and the RUR199iN is a fantastic option. One of the best warranties in the industry and more than a century of experience have made Rinnai a household name. A Rinnai can last up to 20 years on average.

If a component fails, simply replace it with a new one. You don’t necessarily have to purchase a new heating system. However, professional installation is advised, as is with all other tankless heaters. The RUR199iN comes with a range of venting options and doesn’t require expensive Category III material, making professional installation a breeze.

Features

Modulation technology:

A Rinnai RUR199iN uses a different level of flame to heat water depending upon the water demand.

GPM and temperature rise

Temperature Rise 100° F 85° F 70° F 55° F 40°F

Flow rate 3.9 GPM 4.5 GPM 5.5 GPM 7.0 GPM 9.8 GPM

Wi-Fi Technology:

A Rinnai RUR199iN provides a WIFI sensor that allows the user to manage and monitor the units working by using their mobile phone. So no need to physically go to the unit to adjust the desired water temperature.

Ultra-Low NOx

Its latest technology enables it to release a minute quantity of NOx, which makes it more eco-friendly than its comparative gas tankless counterparts.

Warranty

This unit comes with a heat exchanger warranty of 15 years or 12000 hours of usage. It is also accompanied by 1 year on labor cost and 5 years warranty on parts replacement.

Certifications

This unit is energy star certified, AHRI Certified and CSA certified

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Minimum flow rate: 0.4 GPM
  • Water pressure: 50-150 psi
  • Voltage: 120V
  • Water connection: ¾ in. NPT
  • Gas connection: ¾ in. NPT
  • Venting requirement: concentric venting (2 in. by 4in. or 3in. by 5in.) with stainless steel or twin Schedule 40 PVC (2 in. or 3 in.)
  • Minimum/Maximum BTU required: 15,000/199,000
  • Condensate Drain: ½ in. NPT

Specifications

  • Color: Silver Metallic
  • Weight: 64 pounds
  • Dimensions: Dimensions: 31.3 inches tall, 18.5 inches wide, and 11.45 inches deep

Pros

  • Moderately Quiet working
  • Uniform energy efficiency of 93%
  • A maximum flow rate of 11 GPM
  • ThermaCirc360 works like a recirculation pump

Cons

  • Professional installation is suggested, and if you choose to do it yourself, be aware that poor installation may void your guarantee.

Why you should buy this?

If you’re looking for a quality tankless water heater, the Rinnai RUR199iN is an excellent choice. It offers many advanced features that are typically found only on high-end models, such as modulation technology and Wi-Fi connectivity. It’s also backed by a strong warranty.


4. Rheem RTG-95DVLN-2

Best natural gas tankless water heater well water

Rheem RTGH-95DVLN Tankless Natural Gas Water Heater
Rheem RTGH-95DVLN Tankless Natural Gas Water Heater

It is Part of Rheem’s Prestige model line-up where it is the upgrade version of the Rheem RTGH-95DVLN. The main difference between the two versions is a stronger fan, which allowed Rheem to lower the intake and exhaust vent holes from three to two inches.

Although there are propane-fueled units and outdoor variants in the same line-up, this high-efficiency gas tankless heater is meant for indoor usage.

With a pre-wired digital remote control, built-in condensate neutralizer, and ultra-low NOx burner, the Rheem RTGH-95 DVLN-2 is suited for the most demanding hot water families.

The Uniform Energy Efficiency rating of this tankless water heater is 0.93, which is an excellent number for a gas device. The heating chambers are made of stainless steel, and the self-diagnostic system alerts you to any required maintenance or repairs.

Features

Built-in Condensate neutralizer:

Built-in condensate neutralizer neutralizes the acid and corrosive precipitate produced as a result of natural gas combustion.

GPM and Temperature rise

Temperature Rise 100° F 80° F 60° F 45° F 35° F

Flow rate 3.8 GPM 4.8 GPM 6.4 GPM 8.5 GPM 9.5 GPM

Overheating protection:

It’s a safety mechanism that prevents the tankless unit’s water and heat exchanger from overheating.

Self-diagnostic system:

Rheem RTG-95DVLN-2 features a self-diagnostic system that tells you when it is time for maintenance and repair. You won’t have to waste time keeping track of dates as a result.

Recirculation pump kit-Ready:

This unit allows you to additionally install the recirculation pump that will bring the cold water in the pipes back to the unit to heat up. Hence, the water in pipes always remains hot, so you get instant hot water as soon as you open the tap.

Warranty

A five-year warranty is offered on the heat exchanger and parts replacement. At the same time, labor is covered by a one-year warranty.

Certifications

Certified by CSA, AHRI, UL, and Energy Star

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Minimum flow rate: 0.4 GPM
  • Water pressure: 30-150psi
  • Voltage: 120V
  • Water connection: ¾” NPT
  • Gas connection: ½ in. NPT
  • Venting Requirement: 3 in. Schedule 40 PVC, Direct Vent
  • Minimum/Maximum BTU required: 11,000/199,900 BTU

Specifications

  • Color:Metallic Grey
  • Weight: 79 pounds
  • Dimensions: 27.5 inches in height, 18.5 inches in width, and 9.75 inches in depth

Pros

  • Uniform energy factor of 0.93
  • Recirculation pump kit-ready
  • There is enough hot water to support four outlets.
  • The unit’s -30° freeze protection allows it to be installed safely in garages and basements.
  • Rheem’s exclusive Hot Start Programming eliminates cold water bursts by maintaining the unit in a ready-fire position.
  • You can monitor and alter your unit’s optimal temperature as well as receive servicing warnings with the Tankless EcoNet Accessory Kit connected to the EcoNet mobile app.

Cons

  • Despite the fact that the device is EcoNet enabled and designed to attach a circulation pump, these extra utilities are not included and must be purchased separately.

Why you should buy this?

There are many reasons why you should buy the Rheem RTG-95DVLN tankless water heater. Perhaps the most compelling reason is that it has a very high Uniform Energy Efficiency rating of 0.93, meaning it is one of the most efficient gas tankless water heaters on the market today. Additionally, this unit has a number of advanced feature that makes your life easier.


5. Takagi T-H3-DV-N Condensing tankless water heater

Best condensing tankless water heater well water

Takagi T-H3-DV-N Condensing Tankless Water Heater
Takagi T-H3-DV-N Condensing Tankless Water Heater

Takagi is an excellent tankless brand backed by its world’s leading Japanese technology. Its state-of-the-art technology and durable parts make it an excellent choice against hard water. Takagi T-H3-DV-N is a condensing unit, and being a condensing tankless water heater, it uses dual heat exchangers. Its primary heat exchanger is powered with natural gas combustion and is made of copper that giving 20 times more heat transferability. Hence, the heat transfer from the heat exchanger to water is extremely fast. At the same time, the secondary heat exchanger is powered by hot vapors and fumes produced by the combustion of gas and transfer their heat to warm the water. To protect it from corrosion caused by hot vapors and fumes, the second heat exchanger is composed of stainless steel.

This tankless water heater is the best option for those households which are dealing with very cold well water coming in; the reason is that most electric ones do not provide equal numbers of GPM as the Gas ones do. This gas-powered heater will provide you with the highest GPM possible.

Features

Modulation technology:

You can get maximum efficiency due to tankless water heater smart technology. The smart technology complements your hot water needs with the least resources consumption by using multiple operational levels.

GPM and Temperature rise

Temperature Rise 100° F 80° F 65° F 50° F 35° F

Flow rate 3.8 GPM 4.8 GPM 5.8 GPM 7.5 GPM 10 GPM

Overheating and Freeze protection:

With overheating and freeze protection, you don’t need to fear your tankless water heater overheating and scalding you. As its safety feature will cut off the power upon exceeding a certain temperature. At the same time, its freezing protection prevents water from getting frozen in the tankless water heater and damaging the unit.

Troubleshooting diagnostic codes:

Its troubleshooting diagnostic codes help you diagnose the problem that the tankless water heater may suffer from.

Ultra-low NOx

Comply with the SCAQMD rule for ultra-low NOx.

Warranty

15-years for the heat exchanger and a 5-year warranty for all parts.

Certifications

AHRI CSA certified, Energy Star Certified.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Minimum flow rate: 0.40 GPM
  • Water pressure: 15-150 psi
  • Voltage: 120V
  • Water connection: 3/4″ NPT
  • Gas connection: 3/4″ NPT
  • Venting Requirement: 3-4 in. diameter Schedule 40 PVC
  • Minimum/Maximum BTU required: 15000/199,000 BTU

Specifications

  • Color: White
  • Weight: 71 pounds
  • Dimensions: 24.88 inches in height, 17.75 inches in width, and 11.25 in-depth

Pros

  • Energy Efficiency of 93%
  • Durable Stainless-Steel and copper Parts
  • Diagnostic error codes
  • Freeze and overheating protection
  • Energy Star Certified

Cons

  • Need condensate drain
  • Heavy

Why you should buy this?

If you’re looking for a top-of-the-line tankless water heater, the Takagi T-H3-DV-N is an excellent option. This condensing unit offers superior efficiency and performance and features multiple safety protections to keep your family safe. Plus, it’s Energy Star certified, so you can be sure you’re getting the most bang for your buck.


6. EcoSmart ECO 27

Budget Pick

Best budget tankless water heater well water

EcoSmart ECO 27 Electric Tankless Water Heater
EcoSmart ECO 27 Electric Tankless Water Heater

The EcoSmart ECO 27 tankless water heater is widely considered the industry’s best electric tankless water heater. Mainly because it gives a high hot water output as well as in budget It has a number of features that can make your life more relaxing and enjoyable.

An ECO 27 has an amazing energy efficiency of 99.8%, and its self-modulating technology allows up to 50% energy saving. This means that its operations are going to cost you half the money you used to spend on operating storage (tank) water heater.

ECO 27 is also user-friendly in terms of temperature settings. It comes with a digital temperature dial control that allows temperature change in 1 degree so that you can achieve the temperature that you desire most.

Eco 27 is also an amazing choice against hard water. It contains copper and stainless-steel components, making it more durable and corrosion-resistant. Hence, there will be no calcium deposit on the heat exchanger, and neither will the heat exchanger have to overwork to transfer heat to the water. Hence tankless water heater doesn’t have to suffer from lower energy efficiency or a shorter lifespan.

Features

GPM and temperature rise

Temperature Rise 65°F 55°F 45°F 35°F

Flow rate 2.28 GPM 3.35 GPM 4.10 GPM 5.27 GPM

Self-modulating technology

Self-modulating technology brings your energy efficiency to a higher level. The self-modulation technology lets the unit use minimum resources to heat the water to meet your hot water demands. Similarly, use a different level of operation to fulfill your demand.

Warranty

It carries a lifetime warranty on the electronic component, parts, and heat exchanger However; some requirements must be completed in order to obtain this, such as professional installation and routine maintenance.

Certifications

An ECO 27 is certified by CSA, UL 499, and is listed by ETL.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Voltage: 240V
  • Recommended Breaker: 3 x 40A Double Pole
  • Wire Size: 3 x 8 AWG
  • Wattage: 27000 watts
  • Amperage: 113A
  • Water connection: ¾” NPT
  • Minimum flow rate: 0.25 GPM
  • Water pressure: 25-150 psi

Specifications

  • Color: White
  • Weight: 13.75 pounds
  • Dimensions: 17 inches in height, 17 inches in width, and 3.75 in-depth

Pros

  • Reliable copper and Stainless-Steel components
  • It boasts a remarkable energy efficiency of 99.8%.
  • Inexpensive
  • Also, work on hard water
  • Save 50% of the operational cost as energy Saving

Cons

  • Require professional installation to an avail lifetime warranty

Why you should buy this?

There are a number of reasons why you should buy the EcoSmart ECO 27 tankless water heater. Firstly, it is incredibly energy efficient, with an energy efficiency rating of 99.8%. Secondly, its self-modulating technology means that it can save you up to 50% on your energy bills. Thirdly, it is easy to install and comes with a lifetime warranty on the heat exchanger.


7. SIOGreen SIO 18

Best tankless hot water heater well water

SioGreen SIO 18 Infrared Electric Tankless Water Heater
SioGreen SIO 18 Infrared Electric Tankless Water Heater

Without a question, it is the best hot water heater for hard water. The reason is that it doesn’t use a metallic heat exchanger but a quartz heat exchanger. Which results in no scale deposit on the heating element. In addition, the heating elements are not in direct contact with the water but use far-infrared energy to heat the water.

It uses quartz tubes to act as the heat exchanger, inside of which the far-infrared energy is passed to heat the water. Whereas the outer side of the quartz tubes are coated to contain the far-infrared energy inside while only letting the heat be transferred into the water. It includes a self-cleaning design that removes any other kind of scale remnant in the tankless unit.

Features

Overheating protection

To safeguard you and the tankless unit, overheating prevention prohibits the tankless unit from heating water above a particular temperature.

GPM and Temperature rise

Temperature Rise 60° F 50° F 40° F 30° F

Flow rate 2.5 GPM 3.0 GPM 3.6 GPM 4.0 GPM

Modulation technology:

SIO 18 utilizes modulating technology to make sure that it works at maximum efficiency at all times based on your demand. A modulating technology allows the tankless water heater to modulate its operational activity to meet the required level.

Warranty

SioGreen offer a warranty for the unit purchased and installed in the US, and Within 30 days after purchase, you must also register your warranty with the manufacturer. The Sio 18 is covered by a 5-year warranty and an extra 5-year warranty on the heat exchanger.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Minimum flow rate: 0.5 GPM
  • Water pressure: 15-150 psi
  • Voltage: 220V
  • Max power: 75 Amp
  • Minimum breaker: 80A (2 x 40A)
  • Current: 18KW
  • Water connection: 3/4″ NPT
  • Venting Wiring: 2 x 8 gauge

Specifications

  • Color: White
  • Weight: 27 pounds
  • Dimensions: 14 inches in width, 20 inches in height, and 6 in-depth

Pros

  • Corrosion-free
  • Suitable for use with hard water
  • Highly Energy-Saving (98 percent)
  • Maintenance-free

Cons

  • Because the majority of the units are POU, the hot water output is poor.
  • SIO 18 is the largest unit by the manufacturer.

Why you should buy this?

There are many reasons to buy the SIOGreen SIO 18 tankless water heater. First, it doesn’t use a metallic heat exchanger but a quartz heat exchanger, which results in no scale deposit on the heating element. Second, the SIO 18 utilizes modulating technology to make sure that it works at maximum efficiency at all times based on your demand. Finally, it comes with a 5-year warranty on whole unit and an extra 5-year warranty on the heat exchanger. This makes the SIOGreen SIO 18 tankless water heater a worthy buy.


8. Takagi T-KJr2

Best 120V tankless water heater well water

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater
Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

If we talk about natural gas water heaters that give the best value to your investment, one name that you will likely hear will be Takagi T-KJr2. It gives you higher hot water capacity, energy-saving, and several safety features that make it reliable and have a longer lifespan. Such that it can give excellent performance even if your locality has hard water.

Features

Modulation technology:

Takagi T-KJr2 comes with smart technology, which allows it to match its operational level with your hot water demand to ensure the highest energy saving as well as the needed hot water.

GPM and Temperature rise

Temperature Rise 100°F 80°F 60°F 50°F 35°F

Flow rate 2.5 GPM 3 GPM 3.7 GPM 4.7 GPM 6.6 GPM

Multiple level protections:

Takagi supports multiple protections in terms of freezing, overheating, and electrical surge.

Troubleshooting error codes:

Let you know what problem your tankless water heater is facing.

Low NOx

Its eco-friend design allows you a lower emission of NOx.

Warranty

The warranty of Takagi T-KJr2 comes with the implied condition of professional installation; hence a D-I-Y installation will void the warranty. Parts repairs are supported for five years while the heat exchanger is supported for 10 years if installed by a professional.

Certifications

Certified by UL 499 and Energy Star.

Unit’s requirements

      This module needs the following requirements for proper functioning; 

  • Minimum flow rate: 0.50 GPM
  • Water pressure: 30-150 psi
  • Voltage: 120V
  • Water connection: ¾ in. NPT
  • Gas connection: ¾ in. NPT
  • Venting requirement: stainless-steel direct venting (4 inches)
  • Minimum/Maximum BTU required: 19500/140000 BTU

Specifications

  • Color: white
  • Weight: 38 pounds
  • Dimensions: 6.7 inches in depth, 13.8 inches in width, and 20.3 in height

Pros

  • Overheating, freeze and surge protection
  • Low NOx
  • Energy Star Certified
  • Error codes assist in the diagnosis of problems.
  • Excellent warranty

Cons

  • The energy efficiency of 82%

Why you should buy this?

Takagi T-KJr2 is the best deal you can look for if you are considering investing in a tankless water heater. With its high energy efficiency, multiple safety protection, durability and easy installation process. All this at an affordable price means there is no reason why this unit should not be your first choice.


Buyer guide

If you are looking for a tankless water heater that should work with your well water, then you have to understand a couple of things first. But, before we look into some of the best tankless water heaters, let us discuss them one by one. Because there is a strong possibility that you have to make some adjustments to your existing well water system in order to enjoy hot water.

The temperature of incoming water

The temperature of the incoming water is important in the sense that every tankless water heater has a listed GPM, gallons per minute. It means how many gallons of hot water you will get per minute and the temperature of the incoming water significantly affect the GPM. If your unit is rated for 10 GPM, you will get 10 GPM when the incoming well water is warm at around 70°F, but if your incoming water is at 35°, and then the GPM will drop significantly. So, if your incoming water is cold, then we would suggest you get a gas-operated tankless water heater because it can give you more GPM than electric ones.

Quality of the water

Quality of water includes different things such as hard water, sediments, etc. the best example of soft water is rainwater. When rainwater gets absorbed into the land and ends up in the rivers, lakes, and other underground bodies of water, during its travel, it collects minerals. The greater the minerals it absorbs, the harder it gets. When hard water passes through the pipes and appliances over time, its minerals form a scaly layer called limescale.

Tankless water heaters can be used with hard water. The only thing of concern is to ensure that you flush your tankless water heater once a year in order to extend the life of your water heater. The unit’s heat exchanger usually becomes caked with limescale. Hence, it reduces its ability to heat the water.

The process of flushing your tankless water heater is simple. Flushing only takes around an hour. We advise you to choose a tankless water heater that comes with isolation valves so that you can flush your water heater without shutting your whole water supply.

Isolation valves can be purchased separately if your tankless water heater does not come with them. Another option is to put water softener filter, so the water gets softened before it enters the heater.

The 2nd thing is sediments and debris. In conventional tank heaters, the sediment sits at the bottom of the tank, but in a tankless system, sediments have no place to go, so they clog the heat exchanger. These sediments and debris shorten the life of the unit and prevent it from heating water. The tankless water heater is a complex system, and to work its full potential. It needs to be clear of debris and sediment. It would be best if you put sediment and debris filters before the tankless water heater, so it works flawlessly.

Water pressure

Water pressure is extremely important when it comes to tankless water heaters because they need a constant flow of water to function properly. If the water pressure fluctuates, then your tankless unit won’t work properly, and you may have a hot and cold stream of water from the unit. And in the case of low pressure, it won’t work at all.

The solution to this problem is to have a water pressure tank to enjoy a constant stream of water through every faucet in your home. Every tankless water heater has a specific water pressure required to work, so make sure that your water pressure tank and the tankless water unit are compatible.

AwardDesignTankless heater reviewsRetailer
Best buy tankless water heater well water
Staff Pick1. Stiebel Eltron tempra 24 plus
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Best electric tankless water heater well water
2. Rheem RTEX-24
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Best indoor tankless water heater well water
Best Pick3. Rinnai RUR199iN
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Best natural gas tankless water heater well water
4. Rheem RTG-95DVLN-2
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Best condensing tankless water heater well water
5. Takagi T-H3-DV-N Condensing tankless water heater
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Best budget tankless water heater well water
Budget Pick6. EcoSmart ECO 27
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Best tankless hot water heater well water
7. SIOGreen SIO 18
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Best 120V tankless water heater well water
8. Takagi T-KJr2
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Recommendations

The electric tankless water heaters do not provide the highest number of hot water GPM, while the best results are provided by the gas heaters. The Rinnai RUR199iN gas tankless water heater is the best on the market. It is on the higher end economically, but the results justified the price. It provides 11 GPM of hot water with 93% of energy efficiency and the average life span of a Rinnai water heater is 20 years approx.


Conclusion

There you have it top 8 tankless water heats that work great with well water. Through a complete review of our article, you should have come to know that not a single tankless water heater is the same. Some are more efficient, but they come at a higher cost. While others are economical with limited features, now it’s up to you to decide which one to cater to your need within your budget. Hopefully, you now have enough information to make an informed decision on tankless water heaters after reading this post.


Frequently Asked Questions

Can you use an electric tankless water heater with well water?

Yes, tankless water hears can be used with well water, but you have to consider three things.
The temperature of incoming water,
Water pressure from well, and
Quality of your well water. (Water hardness and sediments)

Do tankless water heaters do well with hard water?

Yes, if you do proper, timely maintenance on the unit. The hard water builds a layer of insulation called limescale on the heat exchanger that decreases the ability of the water heater to heat the water.

How long do tankless water heaters last with hard water?

A typical tankless water heater has a lifespan of 18 to 20 years with good maintenance, depending on a variety of parameters such as usage, water hardness, and so on.

How many gallons per minute do I need for a tankless water heater?

If you need to run a shower and a sink, you need a 3.2 GPM tankless water heater. Add together all of the fixtures you anticipate utilizing at the same time to get the correct capacity.


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Emma Johnson
By Emma Johnson

Hi, This is Emma. Author at “BestHeaterGuide.com”. I am a graduate of Mechanical Engineering. Currently researching on heating technology. However, I have learned many home heating techniques and still learning home heating technology. And I love to share my research and reviews.

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