Best Indirect Water Heater

Indirect water supply is very common in modern homes. The main water in our homes comes from a rising main and directly connects the center tap of the kitchen and also connects to the washing machine or even a bathroom shower. Indirect water heaters help to heat water according to our preferences.

Indirect water heaters use the main water heater system of the house. They are also called integrated water heating system or combination space and water heating system. The mechanism that it uses it very straightforward. It does not need any extra maintenance, and they work for a long time without any issues. 

Before indirect water heater needed some minutes to heat the water, but in a first indirect water heater, you can always get hot water storage whenever you turn on the tap. You don’t have to wait for the water to boil up.

But one problem in indirect water is, you will have less control over the temperature and water flow of the water. If you have a large house or a big family, then look for a larger indirect hot water heater to meet up with your needs. In this article, we have listed down some of the best indirect water heaters you can purchase. 

Best Indirect Water Heaters Review

We have researched the market and listed up a few best indirect water heaters—the list based on the overall performance and user reviews.

1. Stiebel Eltron 074050 120V, 3.0 kW DHC 3-1 Single Sink Point-of-Use Tankless Electric Water Heater

This is a cost-effective and energy-saving indirect water heater. It uses 50% less power compared with other indirect water heaters. Thus you will have to pay less electrical bills. You can find this heater in different sizes. You can get hot water instantly.

It heats water in seconds. It comes with a safety switch that ensures no overheating issues. You can install it easily. This heater has a sturdy build. If you maintain it a bit, this will last for years. This modern, looking water heater will fit your bathroom.


  • Easy to clean.
  • Comes with easy installation process.
  • Strong build.
  • It instantly gives hot water.
  • It comes in different sizes.


  • Not for big houses.
  • The instructions are difficult to understand.

2. Westinghouse 80 Gal. Lifetime 4500-Watt Electric Water Heater

This is another well-rated indirect water heater. This product is made with cast iron and painted with shiny silver finish. This color gives this heater a stunning look. The interior is made with cast iron; thus, it is effortless to clean. You can wash the heater with soap and warm water once in a while. With little maintenance, it can last for years.

The temperature is effortless to control. There is a built-in thermometer, with controls that help to turn the heater off when it reaches enough temperature. For a secure control system, there is no overheating issue. This heater comes in two sizes. You can choose between these two sizes depending on your home size.

You can use the lid to reach the heating coil. This makes it easy for regular maintenance. You will get instructions with this package. The customer support of this brand is quite good and supportive.


  • Easy to clean and maintain.
  • Shiny exterior finish features
  • It comes with a limited lifetime warranty.
  • Compact design and cylinder type heater.
  • Suitable for medium to the big house.


  • The paint comes off easily.
  • This heater is expensive. 

3. Rheem MR50245 Marathon Tall Electric Water Heater

This is a modern-looking and very effective water heater. This indirect water heater is made with cast iron and has sleek silver color outside. This color makes it very modern looking. This colors blends with your bathroom fitting.

This model is made with such technology that it is 40% lighter than other indirect water heaters. It has all heating coil components with the package. For a medium-sized home, this heater is perfect. The heater is well-painted and easy to clean.

The temperature is easy to control. There is a built-in thermometer in the wall of the heater. You can control the temperature by pressing a button. This heater is made with durable material. With little maintenance, it will last for ages.


  • Easy to control the temperature.
  • Easy cleaning process.
  • There is a built-in thermometer.
  • Lightweight.
  • Easy to install.
  • Beautiful design and high capacity water heater
  • Durable and robust build.


  • This heater is expensive.
  • The exterior paint has cheap quality. 

4. Triangle Tube SMART80 Phase III Indirect 70-Gallons Water Heater

This is the most updated and best working water heater from Triangle Tube. The water heating system is upgraded in this model. The water flow is also better in this one. Home improvement specialists often recommend this water heater for home use.

This heater has a powder-coated finish, which makes it easy to clean. It comes with an instruction guide. You can easily set up this heater. It is very easy to clean and maintain. It also comes with a 2-years warranty. So you will get a secure purchase. The customer support is also a very excellent warning. 


  • It has a double-wall insulated.
  • Removable top for easy cleaning.
  • Better water flow.
  • Suitable for medium-sized homes.
  • Good customer support.
  • Easy to install.
  • There are hooks on each side of the electrical cord.


  • Some parts are made with a small amount of plastic.
  • You won’t get any heating coil with this heater. 

5. Heat-Flo HF-40 Stainless Steel Indirect Water Heater Tank

Heat-Flo HF -40 is loved by many users. It is made with reinforced steel, and it holds the heat for a long time. It has a powder finish both outside and inside. So, it makes it easier to clean. There is a temperature regulator unit that comes with this. So you can control the temperature.

The opening lid can be opened, and you can clean it easily. The temperature regulator prevents the heater from breaking and overheating. You can use the lid to clean the heating coil.

This product comes with clear instructions. You can set up easily. There is also a remote control that helps you to control the heater. You don’t need to press any button on the heater itself. The operation is quite easy. 


  • It comes with remote control.
  • The temperature regulator prevents overheating.
  • Easy to use.
  • The cleaning process is easy.
  • It comes with an instruction booklet.


  • Dust is visible on the heater for the color.
  • Not suitable for a large house.

6. EZ Supreme Tankless Water Heater

This heater is specially designed for small houses. This indirect heater comes with two hooks on each side, which helps to store the electric cord when not in use. This model from EZ supreme uses less power compared to another indirect water heater. The construction products used in this heater are much economical and eco-friendly.

The interior is made with porcelain and very easy to clean. This heater is easy to maintain. This heater is made with stainless-steel that retains heat and easy to clean. This heater will come with a thermostat that helps to control the temperature.

There is an automatic turn–off option that turns off the heater once it reaches the assigned temperature. Keep the electrical cord safely so that it does not get tangled and gets damaged.


  • Compact design.
  • Built-in thermostat.
  • It has a stainless body.
  • Easy to maintain and offers exceptional durability.
  • Provides hot water to up to 4 bathrooms.
  • Affordable in price.


  • No instruction manual.

7.Burnham AL35SL Alliance SL Hydrastone-Lined Indirect-Fired Water Heater

This is one of the best-selling indirect water heaters in the market. This water heater from Burnham is made with solid and durable material. It will last for generations.

This heater is designed in such a way that you don’t have to think about anything. If you clean the heating coils often and maintain the line a bit, it will last you for decades. It is made with triple-walled metal and 22-gauge steel. This material efficiently retains heat but prevents it from escaping quickly. So the water keeps warm for a long time.

The heating process is very fast. It can serve medium to the big house. This is an energy-saving and economical heater. It uses a very less amount of electricity than other water heaters available in the market. So, you save a lot of money.

The material that it is built from is very eco-friendly and economical. The interior is made with porcelain, and the exterior is powder-coated. Thus, it is very easy to clean.


  • Durable and robust construction.
  • With little maintenance, it can last up to generations.
  • Porcelain finish makes it easier to clean.
  • The heating coil is included with the product.
  • Easy to install.
  • It heats up water faster.


  • It is available in just one size.
  • Some user complains about the scratched surface. 

How Indirect Water Heater Works

If you have a big house, then an indirect water heater is a must. You can rely on an indirect water heater. They do not need any extra maintenance. Indirect water heaters have been on the market for years, and these are very easy to install. For a standalone water heating system, you need to consider many things and have to maintain those a lot. On the other hand, the indirect water heater needs zero maintenance. 

The heating process in an indirect water heater is straightforward. As the water passes through the heating system, the water gets boiled. This is done by the heating coil. In some systems, the water is heated in a boiler situated somewhere near the household. Indirect water heaters are mostly used in the colder seasons. At this time, the household heating system works.

Hybrid Water Heater

It uses electricity to transfer energy from one place to another instead of generating heat directly. These can be two to three times more energy-efficient than conventional electric water heaters.


Hybrid Water Heater

It uses electricity to transfer energy from one place to another instead of generating heat directly. These can be two to three times more energy-efficient than conventional electric water heaters.

Hybrid Water Heater

It uses electricity to transfer energy from one place to another instead of generating heat directly. These can be two to three times more energy-efficient than conventional electric water heaters.


How long does an indirect water heater last?

Ans: If you do some maintenance, an indirect water heater can last for 15 to 20 years.

Is an indirect water heater worth it?

Ans: Indirect water heaters are more efficient for home use. Though you need a storage tank, it will be worth it.

Is gas or electric tankless water heater worth it?

Tankless water heaters save your money in the long run, but initial costs are higher than other tank models. A gas storage water heater saves an average of $108 in energy costs per year over their traditional tank counterparts, while electric tankless heaters save $44 per year.

What is a gas water heater?

Ans: A gas storage water heater or gas water heaters are an easy choice for energy savings, performance, and reliability. It offers high energy efficiency and gives you long-lasting performance.

What is an Insulation Blanket?

An insulation blanket or water heater blanket wraps around your warm water heater to keep it from losing heat. It helps your hot water heater systems to maintain a consistent temperature.

How big of an indirect water heater do I need?

Ans: A 30-gallon indirect heater is enough for a home with 12 to 14 people. For large places, you need a 50-gallon water heater.


Indirect water heaters make your life easier. According to your needs, you may select the right sized water heater. You also should look at the facts of how easy the heater has to maintain.

Cleaning is always challenging as the coil resides at the bottom of the heater. Ceramic and porcelain build are much more preferable as they are easy to clean. Dust and dirt are less likely to stick on them. 

From the list, my favorite is the Burnham AL35SL Alliance SL Hydrastone-Lined Indirect-Fired Water Heater. It has a strong build. If you keep a little maintenance, it can last for decades. This product is perfect for getting domestic hot water.

The inside has built with porcelain, which makes it easier to clean. It heats water instantly. It also comes with a heating coil. You can set up this heater easily. It comes with an instruction manual.  It also comes with a warranty.

Try to buy a heater that comes with a warranty. If any case you have any problem installing or have any leakage issue, the warranty will come in handy. 

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