Best Water Heaters For Hard Water Reviews (2019)

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The market is flooded with water heater products that claim to handle hot water. If you need a reliable guidance on selecting the best water heater for hard water, this is for you.

Be assured we have done our assignment, read user review, and customer feedback before coming up with our list. Hence, in here are water heater for hard water that has been tested and used by customers; hence, our review is based on their experience.

As a result of this, you can be assured of getting a useful water heater in here. We have options for all size households and applications.

Top 10 Comparison Table For Best Hard Water Tankless Water Heater 

Name Rating Prices Fuel Type Application type Location
Rinnai V65IP 4.3 out of 5 stars (4.3 / 5)

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CHECK PRICE ON AMAZON Propane Whole House Indoors

Rinnai RUC98iN

4.4 out of 5 stars (4.4 / 5)

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CHECK PRICE ON AMAZON Natural Gas Point of use Outdoors
Takagi T-KJr2-OS-NG  4.2 out of 5 stars (4.2 / 5)

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CHECK PRICE ON AMAZON Natural Gas Multipoint or Point of use Outdoors
ECOTOUCH  1.5 GPM  4.5 out of 5 stars (4.5 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
Takagi T-KJr2-IN-LP  4.2 out of 5 stars (4.2 / 5)

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CHECK PRICE ON AMAZON Propane Point of use Indoor
Gasland BS158 1.58GPM 6L  4.1 out of 5 stars (4.1 / 5)

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CHECK PRICE ON AMAZON Propane Point of use Outdoors
Marey Power Pak Plus  4 out of 5 stars (4 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
EcoSmart ECO 11  4 out of 5 stars (4 / 5)

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CHECK PRICE ON AMAZON Electric Point of use Indoors
 

Stiebel Eltron 224196 240V

 4.4 out of 5 stars (4.4 / 5)

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CHECK PRICE ON AMAZON Electric Whole House Indoors

Takagi T-H3M-DV-N

 4.7 out of 5 stars (4.7 / 5)

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CHECK PRICE ON AMAZON Natural Gas Whole House Indoors

Top 10 Tankless Water Heater For Hard Water

1

Rinnai V65IP 6.6 GPM Indoor Low NOx Tankless Propane Water Heater

  • Fuel Type: Propane
  • Application Type: Whole house
  • Location: Indoor
  • Btu: 150,000
  • Gpm: 6.6
  • Energy Efficiency:
  • Size: 9 x 8.8 x 23.6 inches
  • Weight: 49.6 pounds
  • Display: Digital
  • Warranty: 10-Year Warranty on Heat Exchanger, 5 Year Parts

First on our list of hard water heater for hot water is the Rinnai V65IP 6.6 GPM. This is a small hard water heater that runs on propane and can take care of all your water need. It helps take care of hard water as it comes essential technology that softens it. Hence, it can take care of your shower, laundry, and dishwashing needs.

It is a very efficient heater, suitable for indoor installation. It regulates propane consumption and comes with an LCD display where you monitor the water output temperature. You can get an output water temperature ranging from 98F to 140F. Besides, this unit will sure save you money in the long run, as reported by many users.

Users get a temperature lock that keeps the outlet water temperature fixed to a particular state. All in all, this is an excellent water heater for hard water.

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PROS:
  • Suitable to handle hard water
  • Ease of use, compact and can be installed anywhere
  • Installation is easy
  • A constant supply of hot water guaranteed

CONS:
  • A slight delay before hot water starts flowing

User Rating:

4.3 out of 5 stars (4.3 / 5)

2

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater, Twin Pipe

  • Fuel type: natural gas
  • Weight: 82 pounds
  • Size: 10 x 18.5 x 26 inches
  • Energy efficiency: 96%
  • GPM: 9.8
  • Location: Outdoor
  • Application type: Single point use
  • BTU: 199,000
  • Warranty: 12 years

Rinnai RUC8iN is one of the best water heaters for hard water. With natural gas as its source of energy, it gives temperature within the range of 98 to 150F. It provides an impressive flow of 9.8 gallons per minute, enough to handle all you need, up to 5 points. With an energy efficiency of 95%, you can expect optimum performance from this unit.

The maximum power is 199000 BTU per hour and needs just 2 Watts to start working. It comes with two venting options: the twin pipe and the concentric PVC. You get to decide which one is appropriate for you based on your Point of installation.

This unit is also suitable for commercial water heating with its impressive flow rate. It produces minimal noise and fit to handle hot water effectively.

PROS:
  • Suitable for commercial and residential use
  • Low noise
  • Impressive flow rate
  • Impressive energy efficiency

CONS:
  • Unit is quite pricey
  • Installation is technical and needs an expert

User Rating:

4.4 out of 5 stars (4.4 / 5)

3

Takagi T-KJr2-OS-NG Outdoor Tankless Water Heater, Natural Gas

  • Application Type: Single Point or Multipoint
  • Location: Outdoor
  • Fuel: Natural Gas
  • Btu: 19,500 – 140,000 BTU/hr
  • Gpm:6 GPM
  • Energy Efficiency: 82%
  • Size: 20.5″ H x 13.8″ W x 6.7″ D.
  • Weight: 38 pounds
  • Display: Digital
  • Warranty: 12-year heat exchanger, 5 year parts, and 1-year labor.

On the lookout for a tankless heater for hard water, Takagi T-KJr2-OS-NG is a good option. Powered by natural gas, it is portable and comes with state of the art technology to keep the hot water flowing to every Point on demand

With an impressive and powerful flow rate, it can serve many points at once. The maximum power demand in 140,000 BTU per hour. It is fit for outdoor installation and can help soften hard water

There is a fully modulating burner that helps regulate the gas and burner. This helps limits the consumption of fuel. You also get to control the water temperature via the remote control. It is cost effective and can be used as a direct vent tankless heater

PROS:
  • Made with high-quality materials
  • High saving on energy bills

CONS:
  • User have to purchase extra installation accessories

User Rating: 

4.2 out of 5 stars (4.2 / 5)

4

ECOTOUCH Tankless Water Heater Electric, 1.5 GPM On Demand Hot Water Heater with Remote Control Digital Display Energy Efficient 5.5kW at 240V, Black

  • Fuel Type: Electric
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 1.5 GPM
  • Energy Efficiency: 98%
  • Size: 4 x 9.7 x 4.1 inches
  • Weight: 6.22 pounds
  • Display: digital
  • Warranty: Lifetime

On the search for the best hot water heater for well water, ECOTOUCH Tankless Water is a brand worth considering. It is one of the high-end tankless water heaters with lots of amazing features that makes it the best choice for many people. There is the smart modulation technology which makes the heater stand out. It is capable of heating water from 67F to 109F and moves water at a flow rate of 1.2GPM.

It comes in small size, perfect for Point of use systems like under the sink and bathroom faucets. It gives clean water free of bacteria growth and can help soften hard water. With the smart modulating technology, there is reduced demand for hot water, which translates to impressive saving on energy bills.

There is a digital display and a touch control which makes the unit very easy to use. The remote control makes it more convenient.

PROS:
  • It can handle hard water
  • Produces safe water for drinking
  • Impressive safety features
  • Installation is straightforward

CONS:
  • Some user complained that temperature does not get hot enough

User Rating: 

4.5 out of 5 stars (4.5 / 5)

5

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

  • Fuel Type: Propane gas
  • Application Type: Point of Use
  • Location: Indoor
  • Btu: 140,000
  • Gpm: 6.6
  • Voltage: 120 Volts
  • Energy Efficiency: 81%
  • Size: 7 x 13.8 x 20.3 inches
  • Weight: 40 pounds
  • Display: Digital
  • Warranty: 10-year heat exchanger and five-year parts

Powered by propane gas, Takagi T-KJr2-IN-LP is a tankless water heater unit worth considering to take care of hard water. This is a small compact unit that employs a 4-Inch category III stainless steel venting system. It is an excellent choice for moderate hot water demands and can handle two sinks at once.

It uses stainless steel for fumes and can give water temperature as high as 150F. Hence, this is a recommended option for your dishwasher, shower, and kitchen needs. There is a switch on the system where you can adjust the outlet water temperature. There is also a remote control for fast access.

The unit comes with safety features like overheat, freeze, and surge protection. The maximum power output is 140,000 BTU. Hence, it is pretty effective.

PROS:
  • Simple installation
  • Compact size
  • Low noise
  • Impressive safety features

CONS:
  • Possibility of a slight delay in water flow for heavy use

User Rating: 

4.2 out of 5 stars (4.2 / 5)

6

Tankless Water Heater, Gasland BS158 1.58GPM 6L Outdoor Portable Gas Water Heater, Instant Propane Water Heater, Overheating Protection, Easy to Install, Use for RV Cabin Barn Camping Boat

  • Fuel Type: Propane
  • Application Type: Point of use
  • Location: Outdoor
  • GPM: 1.58gpm
  • Energy Efficiency
  • Size: 8 x 6.1 x 17.3 inches
  • Weight: 14.75 pounds
  • Display: digital
  • Warranty: 1 year

On the series of the best hot water heater for hard water, we have a brand from Gasland BE158S. This is a tankless water heater that runs on propane, recommended for outdoor use. It is light in weight, effective and best for Point of use applications. It can be used for camping and all form of outdoor use.

It is pretty simple to install and requires a maximum power of 41,000 BTU per hour. The instruction manual guides you in all you have to do. This impressive unit can get you 11% saving on hot water bills. It handles hot water well, ensuring your unit last for years to come.

All your hot water needs of the house is taken care of with this Gasland BE158S. It comes with all essential installation accessories as well.

PROS:
  • Installation is simple
  • Impressive saving on hot water heating bills
  • Can handle hard water effectively

CONS:
  • The manual would have been best with some installation manual.

User Rating: 

4.1 out of 5 stars (4.1 / 5)

7

Marey Power Pak Plus Tankless Electric Water Heater, 220 VOLT

  • Fuel Type: ELectricity
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 3 GPM
  • Energy Efficiency:
  • Size: 5 x 12 x 11 inches
  • Weight: 7 pounds
  • Display: None
  • Warranty:

Also on the list of tankless water heater for hard water is Marey Power Pak 220 Volt. This unit stands out for being compact with the ability to provide water for various needed points in the house. This unit allows the user to regulate energy consumption. Hence, the device matches the power demand for the electrical capacity of the house.

Marey Power Pak 220 enjoys high-quality standard  materials and accessories. It can be wired with 10 Amp, 20 Amp, 30 Amp or 40 Amp breaker. It gives impressive saving on water heating cost. The manufacturer reports that you can get up to 60% savings, impressive.

You can use it with one or two points at the same time, depending on your incoming water temperature and the flow rate. It can handle hot water adequately. Activation pressure needed is shallow. For it to control hot water adequately, there are filters on the sediments that absorbs harmful minerals that could damage the unit.

PROS:
  • Impressive saving on energy bills
  • It is versatile
  • Saves space and easy to install
  • Can handle hard water perfectly

CONS:
  • A display would have been nice

User Rating: 

4 out of 5 stars (4 / 5)

8

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

  • Fuel Type: electricity
  • Application Type: Point of use
  • Location: Indoor
  • GPM: 2 gpm
  • Energy Efficiency: 99.8%
  • Size: 5″ x 8″ x 3.75″
  • Weight: 5 pounds
  • Display: digital
  • Warranty: Lifetime

With smart and advanced technology, Ecosmart has positioned itself as one of the top tankless water heaters for hard water. It can give impressive savings on water heating cost. It is cheap to maintain and suitable for wall mounting. This brand features a self-modulating technology that controls its demand for power.

This unit is suitable for hard water. It is best used as a point of use application. It gives a flow rate of 2 gallons per minute and can provide a temperature rise of 67F. It can comfortably handle two sinks and a shower in warm climates.

As long as you size it correctly, it can give an endless supply of hot water to every faucet of use. The inlet water temperature is essential if you want to go for this tankless water heater. Also, the number of the device that will run on it is also vital.

PROS:
  • The lifetime warranty is a big plus
  • Impressive energy saving
  • Spare parts easily available
  • Noticeable reduction in energy bills

CONS:
  • Need for extra installation cost

User Rating: 

4 out of 5 stars (4 / 5)

9

Stiebel Eltron 224196 240V, 1 Phase, 50/60 Hz, 12 kW Tempra 12 Plus Whole House Tankless Electric Water Heater, Advanced Flow Control

  • Fuel Type: Electricty
  • Application Type: Whole house
  • Location: Indoor
  • GPM: 3.0 GPM
  • Energy Efficiency:
  • Size: 5 x 21.5 x 8.5 inches
  • Weight: 3.5 pounds
  • Display: Digital
  • Warranty: 7 years leakage/ 3 years parts

In the series of water heater for hard water, Stiebel Eltron Tempra 12 Plus is a top choice. It comes at a reasonable price and less expensive to install. It runs on electricity, removing the need for additional venting cost. It is very efficient and performs excellently at heating hot water and raising the water temperature to the desired Point. It is a highly efficient unit with multiple heating elements that activates the heat on demand.

This unit features an advanced flow control system which adjusts the rate of power demand based on water quantity. The flow rate ranges from 0.37 gallons per minute to 3.0 gallons per minute.  It requires a 20 Amps circuit breaker and copper wire for installation. Water is supplied at a steady temperature, which eliminates fluctuation.

With Stiebel Eltron Tempra 12 Plus, you can get at least 15% saving on your hot water heating bills. The design is sleek hence can be installed in any convenient spot.

PROS:
  • No noise
  • Sleek design
  • Pretty affordable
  • Pretty easy to install
  • Impressive saving on heating bills

CONS:
  • Installation is best done by a trained personnel

User Rating: 

4.4 out of 5 stars (4.4 / 5)

10

Takagi T-H3M-DV-N Condensing Direct Vent Tankless Water Heater, Natural Gas

  • Fuel Type: Natural Gas
  • Application Type: Whole
  • Location: Indoor
  • GPM: 6.6 gpm
  • Energy Efficiency:
  • Size: 8 x 13.1 x 29.5 inches
  • Weight: 49 pounds
  • Display: Digital
  • Warranty: 15 years

Finally, on our series of tankless water heater for hard water, we have Takagi T-H3M-DV-N. Powered by natural gas, it can handle all your hot water needs, capable of serving two bathrooms at the same time. It works effectively for all forms of domestic heating applications.

In a warm climate, this unit will serve two bathrooms and a single bathroom in colder climates. It is a condensing tankless water heater that serves residential application well. There are safety features which ensure the protection of the user, making it appropriate for indoor use.

Takagi T-H3M-DV-N employs the category IV heating system. It can work with any of PVC, CPVC, or ABS piping system, making it flexible. There are enough installation accessories that you get on buying this unit. We love the overheat protection, internal freeze protection, and other impressive safety features.

PROS:
  • Energy Star certification
  • Easy installation
  • Presence of safety features
  • Direct vent unit.

CONS:
  • The unit must be installed by a professional, or you risk voiding the warranty

User Rating: 

4.7 out of 5 stars (4.7 / 5)

Frequently Asked Questions

What Are The Consequences Of Hard Water?

Hard water and a water heater is a bad combination. Hard water causes damage to the tank of a tank water heater and the heating element. It triggers corrosion, which reduces the life span of your heater.

A water heater comes in three major components: the heating elements, thermostat and water tank for a tank water heater or heat exchanger pipes for tankless. The heating element raises the temperature of the water. The thermostat decides when the water temperature gets to the required state. Hard water damages the heat exchanger pipe of a tankless water heater and tank of traditional water heaters. This calls for a need to chose a water heater that can resist hard water if you stay in an area prone to hard water.

What Makes a Water Heater Suitable for Hard Water

There is a couple of water heater brand that makes a product that can resist hard water. This water heater comes with technology that reduces the damage of hard water to the wall of the tank and the heat exchangers.

However, there are other solutions like using a water softener in the water heater. It softens hard water before it gets to the heating element hence reducing the damage it can do. With water softeners, the constituent elements of hard water: calcium and magnesium are converted into soft forms. This reduces the destructive impact it has on your water heater.

Also, the traditional water heater that is resistant to hard water usually comes with Porcelain Enamel Glass Lined Tank. This:

  • Makes your tank resistant to corrosion
  • Reduces deposition of scale etc.

 

Selecting the Best Water Heater for Hard Water

Getting the capacity of your water heater right is critical as this determines how efficient the heater will be. An undersized heater will likely not serve all your faucet while an oversized one leads to wastage. Take the following into consideration in sizing your water heater

  1. The number of people living in the building is one of the most important factors to consider. In addition to this is how your household uses water. This will help get a good energy efficient water heater and size it correctly.
  2. The type of climate you are staying is also essential. This is because the climate type determines how long it will take your heater to raise the temperature of your water to the desired Point.
  3. The Point of installation is a factor you should consider as well. All in all, we recommend a central place if you are going for a water heater that will serve the whole house.

 

Conclusion

If you live in an area prone to hard water, it is best to go for hard water tankless heater. Not only will your water be safe and appropriate for use, but you will also get a durable unit that will last many years to come.

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