The 5 Best Tankless Water Heater for Shower Reviews 2020

The popularity of tankless water heaters has skyrocketed these days for all the right reasons. People are switching to the tankless water heaters from conventional water heaters, for they provide a continuous supply of hot water without increasing the billing cost.

The first thing you want in the morning is a nice hot bath so that you can start your day. Imagine you are in the shower, and suddenly cold water comes out of the tap instead of hot water. How would you feel? Well, no one wants to take a shower with cold water on a chilling winter morning. SO, if you are on a hunt to buy a water heater, then you should purchase the best tankless water heater for shower.

Unlike the traditional tankless water heater, they have a large flow rate and supply hoy water constant so that you don’t run out of hot water during the shower. The best part is that they are small in size, so they do not take much space.

Let’s discuss some of the best tankless water heater for shower so that you can buy one that best suits your needs.

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 Best Tankless Water Heaters for Shower Reviews:

If you want to purchase a tankless water heater, then you have come to the right place. Here we have given a detailed review to help you find the best tankless water heater for shower.

1. Takagi T-KJr2-IN-LP Indoor Tankless Water Heater:

Takagi T-KJr2-IN-LP

It is a discrete, small, and efficient tankless water heater that is designed for large to medium homes. If you do not want to spend a lot of effort in maintaining a tankless water heater, then Takagi T-KJr2-IN-LP is the best choice for you.

Small and lightweight:

It is one of the smallest and lightweight tankless heaters for shower among all Takagi products. So, you can install it anywhere according to your needs.


It is a propane tankless water heater and works pretty much the same as a gas tankless water heater. It requires the power input of 140000 BTU per hour, which makes it perfect for residential use.

Flow rate:

The unit has a flow rate of 6.6 gallons per minute, which means it can support two bathrooms and two faucets at the same time. But remember it is not intended to be the whole house water heater. It is a point of use tankless water heater, which is not powerful enough to provide hot water to the whole house.


The installation of this tankless water heater is relatively easy. It is a propane tankless water heater, so fumes are unavoidable. It is suggested to contact a professional plumber if you do not know much about the plumbing work.


  • Requires minimal maintenance
  • Easy installation
  • Affordable price
  • A small and compact unit
  • Easy temperature settings
  • Supports two bathrooms and faucet at the same time


  • May experience flow delays due to heavy demand
  • Makes noise while working
  • Not suitable for large homes
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2. Rinnai RUC98iN Ultra Series Tankless Water Heater:

Rinnai RUC98iN Ultra Series 2020

If you are looking for a natural gas tankless water heater for shower, then it is the best choice as it is a hot selling type of Rinnai water heaters.

High flow rate:

It is one of the best tankless s water heaters as it comes with a flow rate of 9.8 gallons per minute.

Energy efficiency:

With the high flow rate, this tankless water heater is energy-efficient too. It saves energy by up to 95%.

Space-saving design:

The best part of the unit is that it has a space-saving design. Which means you can install it inside the house without getting worried about the space. If you install a unit near the faucet, then tankless water heaters take less time to heat water, which ultimately decreases the energy cost.

Dual venting option:

It gives you the option to choose both concentric PVC and twin-pipe for venting.

Heating time:

The unit takes a few seconds to heat water, but don’t worry; you do not need to wait too long. Within 20 seconds, you will be getting an endless supply of hot water.


  • Powerful enough
  • Double venting facilities
  • Up to 0.92 Uniform Energy Factor
  • Water temperature control panel
  • Easy to Install
  • Does not make noise
  • Endless supply of hot water
  • Saves energy up to 0.95


  • Drop in temperature
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3. Stiebel Eltron Tempra Plus 24 kW Tankless Water Heater:

Stiebel Eltron Tempra Plus 24 kW

The usage of tank water heaters has reduced in recent years because they take much space and are not energy efficient. Tankless water heaters are popular for the benefits associated with them. Stiebel Eltron Tempra plus 24K is a technologically more advanced tankless water heater.

High flow rate:

One of the best things about this tankless water heater is that it has a high flow rate of 5 gallons per minute. It means it can support two bathrooms at the same time.

Self-modulating technology:

The unit features the self-modulating technology. It only works when you need hot water, which means when you are not using it, the unit will not be working. So, there will be a reduction in monthly energy bills.

The advanced flow control system:

Since it is a technologically advanced tankless water heater, it features the advanced flow control system. When it senses the cold water, it automatically starts heating water. In simple, words you will not be having any cold water sandwich while taking a bath.


  • Compact size
  • Proven reliability
  • Ergonomic design
  • Efficient performance
  • The advanced flow control system
  • Self-modulating technology
  • Makes no noise
  • Easy installation


  • Needs a lot of power to keep working
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4. EcoSmart ECO 27 Electric Tankless Water Heater:

EcoSmart ECO 27 Electric Tankless Water Heater

This is electric tankless water from a very popular brand and is a great deal of choice.


It is an energy-saving unit that helps you save up to 50% on monthly energy bills. It features the self-modulating technology, which allows it to work only when needed.

Easy to install:

It is an easy to install unit; however, we always recommend consulting a professional plumber to avoid any problem.

Digital temperature control:

The unit comes with an easy to control digital temperature control in 1 increment.

Compact size:

The best thing about tankless water heaters is that they have a compact design, which means you can install them anywhere you want to. EcoSmart ECO 27 electric tankless water heater also has a sleek design, which makes it the best choice for households.

Endless supply of hot water:

It consumes less energy and provides an endless supply of hot water. What else can one want?


  • Easy to operate digital control system
  • Copper and stainless steel components
  • Self-modulating technology
  • Compact size
  • Savings of up to 0.50 on water heating costs


  • Difficult to adjust the right temperature
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5. Rheem RTEX-13 240V Heating Chamber Residential Tankless Water Heater:

Rheem RTEX-13 240V

It will be a great choice for you as it is one of the widely praised tankless water heaters in 2019. It provides hot water perfectly on demand.

Compact design:

What can be better than installing a unit that not only saves energy but saves space as well? Rheem RTEX-13 240V is a tankless water heater that does not occupy much space, for it has a compact design. Install it in a tiny house or a small studio; it will work great without taking much space.

Fast heating time:

You have installed a tankless water heater so that you do not have to wait long to get hot water. Rheem RTEX-13 240V is a tankless water heater that only takes 15 seconds to flow water to the faucets.

Easy installation:

If you want to save money on installation cost and you have the know-how of plumbing work, then install it by yourself. The installation is quite simple. However, if you do not know anything about plumbing work, then it is better to call a professional plumber.

Flow rate:

The flow rate of the unit reaches up to 4galloms per minute, which means it is perfect for single bathroom use. In warm climates, it can support one bathroom and a faucet at the same time.


  • Stable water temperature
  • Saves money on energy bills
  • Provides an endless supply of water
  • Perfect for singe bathroom or studio use
  • Simple installation
  • Energy efficient
  • Small and lightweight


  • Not suitable for large homes
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Things To Consider While Choosing Best Tankless Water Heater For Shower:

What is the first thing you want to do after coming home from a long hectic day? Of course, you want to take a hot bath to feel relieved and relax. But the most annoying thing that can happen while taking a shower is the change in water temperature. It may change form cold to hot and hot to cold. And to the worst, you may run out of hot water. So, how can you avoid these problems? You need to consider a few things before buying a tankless water heater for shower.

  • Flow rate:

The first thing you should do before buying a tankless water heater is to determine your hot water needs. The flow rate of tankless water heaters for shower is relatively low, so if you want hot water in multiple spots, then you need to buy a whole house tankless water heater. But if you need a water heating unit for a single faucet, then a model with a small flow rate will meet your needs.

  • Instant hot water:

You do not wait long to get hot water in the morning when you are running late from work, right? Then check how much time the model you are buying takes to heat water. Tank water heaters take at least thirty minutes to heat the water stored in their tank. But tankless water heaters offer instant supply of hot water. However, you need to remember that it may take a few minutes for hot water to reach the tab.

  • Stable water temperature:

To avoid the cold water sandwich, the tankless water heaters are equipped with an automatic temperature control system. It adjusts the water temperature according to your needs. It automatically starts heating the water if it senses temperature drops.

  • Continuous supply of hot water:

Tankless water heaters are designed in a way that they provide an endless supply of hot water. So make sure the unit you are buying supplies hot water constantly. You do not want to run out of hot water while taking a bath, and it may happen if you stick to a tank water heater.

  • Size Of the unit:

Do you live in a large or small home? We are asking this question because you have to purchase a tankless water heater for shower according to your hot water requirements. You want a water heater that does not take much space, then buying a tankless water heater is the right choice. But make sure the size you are buying produced enough hot water to meet your needs.

  • Smart technology:

If you have enough budget, then purchase a tankless water heater that features small technologies sic as overheat protection and overpressure protection as well. The unit with these features will be safe to use and have a longer service life.

Size Of Tankless Water Heater For Shower:

You should install a tankless water heater according to your needs. Tankless water heaters are relatively small in size, which makes them the best choice for those who live in tiny homes. You can also install them in small studies and offices as well. You can install them outdoor too, but you need to take care of the unit as chilly winds can freeze the water heating units.

They are large in size as compared to the point of use tankless water heaters and under sink tankless water heaters. So, you should choose the unit that best suits your budgets and requirements.

The Best Tankless Water Heater For Shower:

Types Of Tankless Water Heaters For Shower:

Tankless water heaters are energy-efficient and help you save money month energy bills each month. According to the power source, there are three types of tankless water heaters:

Electric tankless water heater for shower uses electricity as the main power, but it is less powerful than the gas tankless water heaters. But it does not mean that it will not supply hot water continuously. It is suitable for a single bathroom or a single bathroom and one faucet at the same time. They are more expensive than the gas type of water heaters

The natural gas tankless water heater for shower is the most common type of water heating unit. It has a large flow rate, which means it is suitable for more than one bathroom at the same time. The installation cost of these tankless water heaters is a bit high, for venting facilities are required to emit gases if you install them indoor.

Installation Tips:

A tankless water heater eliminated the need for a conventional water heater. But the working performance of the tankless water heater is, to a large extent, determined by the installation of the unit. In simple words, the installation involves more than just changing a tank unit.

For safety, better performance, and longer life of the unit, you need to install it in the right way. Otherwise, the unit may get damaged, and leaks may happen. Let’s have a look at few tips that can help you hanging or mounting a tankless water heater for shower in the right way:

  • First of all, read the instruction manual carefully
  • If you do not know about plumbing, then calling a professional plumber would be better.
  • Install a gas or propane tankless water heater to an airy place. Do not install them in the bathroom.
  • Do not get a tankless water heater wet.
  • Install it at a place where it is convenient to operate.
  • Venting facilities are required in case of an indoor installation of the unit.
  • If you install a unit outdoor, a protection cove is needed to prevent damages to the unit.

If you are fed up, bearing high energy costs at the end of each month due to your tank water heater, then this is the time to switch to an energy-efficient unit. Tankless water heaters are gaining popularity for the benefits they offer. They are easy to install, occupy small space, energy-efficient, and provide an endless supply of hot water.

You can choose a tankless water heater according to your needs and requirements. There are numerous types of tankless water heaters available out there.

No matter you want a tankless water heater for shower or a whole house tankless water heater, you can find them on Amazon. Check the prices and other details of each product to decide which one to buy to solve your hot water problem.