Top 40-50 Gallon Indirect Water Heaters-Reviews & Buyer’s Guide

Indirect water heaters are all the rage these days. Be it the harsh cold winters or the hot summers, these heaters can come in very handy and can save you a lot of money. If you invest in a highly efficiencient water heater, you can live a better live as a whole and it also is good for the environment as you will be saving energy along with money.

You will get these indirect water heater models in various sizes which will be compatible with any kind of home, catering to every individual’s needs. Every home is different. Keeping these in mind, the indirect water heater machines have been designed in such a way that the user can take his or her pick in terms of tank size, performance, the output amount of water, various applications, etc. Depending on the intrinsic power of the electric water heater, one can look through many choices. Tankless water heater units are also available at a different price range. If you are a small family, you can check out of the best 40-gallon indirect water heater reviews to understand it a bit more.

List of Top Rated Indirect Water Heaters

Product ImageProduct CodeDimensionsGallons storageDetails
SuperStor 45 Gallon Indirect Water HeaterSuperStor SSU-45 gallon52.5 x 19.26 inches45 gallons
AB IWH401C indirect water heaterAB 401C Indirect Water Tank Heater54H x 21D inches38.6 gallons
Crown Mega Stor II Indirect Water HeaterCrown Mega Stor II 49.75H x 23.51D inches50.0 gallons
Triangle Tube Smart80 Indirect Water HeaterTriangle Tube SMART8061H x 26D inches70+additional 14 gallons
Amtrol Indirect Water heaterAmtrol WX 30248.0H x 22.0D inches86 gallons

Points to consider while choosing an indirect water heater

The amount of power a standard home needs to run properly is the primary factor to keep in mind when you purchase a new indirect water heater. Even if you are replacing an old one with a new indirect water heater, it is very important to keep the power consumption in mind. Depending on that, you can choose the model which is best for you. Another factor is how frequently you will be using the water heater.

Size

While talking about the size or capacity of a water heater, we usually are referring to the internal indirect water heater tank of the water heater. When it comes to modern indirect water heaters, the size ranges from 35-125 gallons. If you need a water heater for your home, you should go for the one which has 35 to 45 gallons capacity in the tank. If you have a bigger house or it is for supply of an entire building then larger sizes are preferred.

First initial hour rating

First hour initial rating refers to the capability of the heater to provide necessary amount of heated water within the first initial hour after it is turned on. When you are considering this rating, the indirect water heater’s maximum capacity and rate of recovery needs to be kept in mind.

One important thing to check out while looking for the best indirect water heater, is whose rating you are checking. This is because every family rates the first initial hour rating on the basis of their usage, size of home and personal requirements. If you want to understand your best choice in terms of energy efficiency properties, output of the heated water, then you need to first understand how much water you and your family will be using. Put in your numbers on a table and then compare them to the ratings. Consider your calculations of water represented in gallons for each round of application.

Review of the 5 best indirect water heaters

SuperStor SSU-45 Indirect water heater

SuperStor 45 Gallon Indirect Water Heater

If you come across any SuperStor water heater reviews, you will know that most customers are more than happy with their purchase. The SuperStor SSU indirect water heater is made of a stainless graded steel internal tank. In order to reduce the heat loss per hour and hasten the recovery per hour rate of the heater, the insulation of the tank has been completely redesigned into a new form. This has made the SuperStor indirect water heater extremely efficient in terms of energy savings. Everyone wants their appliances to be safe and compact for home-use but also expect commercial scale performance. And that’s exactly what you will get with this SuperStor II. The hote-heated water rate delivery of the HTP SuperStor SSU 45 heater is more than 50% as compared to other indoor water heaters.

Stainless-steel is the best material if you want something durable. Even at higher temperatures, the tank will be protected against any corrosive damages. This makes the water heater last longer and you don’t have to spend a lot of time in cleaning and maintaining it either.

There is a buffer tank which has a cold-water circuit inbuilt in this product. This helps in eradicating common heater issues like short cycling. The 45-gallons tank is lightweight and doesn’t take up a lot of space. It can handle regular water supply in large amounts and is perfect for your home.

Even the internal tube is made of stainless steel which makes it resistant to rusting. As compared to regular heaters, this SuperStor will extract 5 to 7 percent additional hot water, on an average. Rated 4.5/5 by the buyers, the review of this 40-gallon indirect water heater review is just amazing and confidence boosting.

As it seems, stainless steel is the best material for such items. Hence, water in-let chamber and the aquastat well are also made of stainless steel. A finned alloy of copper and nickel is used for the commercial heating exchanger apparatus. It can be spread out to almost twenty square feet with 11 fins in each inch throughout its length. The advantage of this design is that it can help the heater have a higher and better output in BTU terms.

There is a 2 inches insulation wall made of blown water foam along the body of the heater. This is the reason why the heat loss per hour is so much less as compared to older models. It is lesser than half a degree Fahrenheit per hour. One of the best things about this is that the SuperStor SSU 45 doesn’t emit harmful CFC’s. The pressure flow for this indirect water heater is ten gallons/hour. The averaged pressure drop should be around 8.0 feet to 7.89 feet. The hour rate needs to be considered when understanding the flow rate. For example, for 140 degrees Fahrenheit, 212 gallon water is drawn in one hour.

The installation is easy and this model is equipped with a one-inch supply for the boiler and a similar return boiler connection. It is certified by NSF and is completely lead-free. The exterior body is made of galvanized steel with a light coat of attractive silver color. Even the out layer is protected from issues like rusting and is sturdy enough to not get easily damaged or dented.

Main Features

  • Water tank size: 45.1 gallons
  • Working Water Pressure is 150 psi
  • Energy output of heat: 140.000 BTU
  • Product weight: 72 pounds
  • Colors available” Silver grey
  • It has a 212 GPH of first hour rate
  • Product dimensions: 52.5H x 19.25D inches

Advantages

  • Considerably less heat loss per hour
  • Advanced insulation
  • Heater exchange is of commercial scale, performance-wise
  • Water output is more than 50% more than other regular heaters
  • It saves energy and money
  • Recovery rate is far more superior as compared to older models

SuperStor is among the best indirect hot water heaters you can choose, for your home water-heating requirements.

AB 401C Indirect Hot Water Heater

AB IWH401C indirect water heater

Do you live in a place which has harsh, freezing cold months? In such places, a water heater is a life essential. If you are in constant need of heated water and your area has very low temperatures overall, throughout the year, then you should definitely go for the AB IWH401C Indirect Hot Water Heater. It is made by Alfa heating supplier system and it can carry 38.6 gallons water.

The overall heat output of the water heater, in each hour, is 2.5 KWs (kilowatts) (8530 BTU) which is quite impressive. Because of this, huge volume of water can be handled by this heater at one go. It can heat up around 38-41 gallons of water and it comes with just one coil. The tank is made in such a way that it can withstand harsh and cold temperatures throughout. It is best for any close-looped homes. It is highly effective in such places giving the user top-notch water heating services at a very energy-efficient manner.

This indirect water heater comes with an Incoloy of 800 immersion electric element which is very low in density. The performance of the water heater is constant & efficient and gives off a 21 gallon recovery rate in one hour. The outlet and inlet threads are ¾ inches which is the certified measurement for those according to the NSTP chart (National Standard Taper Pipe).

Now let’s talk about the tank which comes with this heater. The tank is made of enamel stainless steel and this helps in protecting the system from overall corrosion and it also prevents the build-up of rust and other materials. This tank can withstand the corrosive nature of hard water which means that you don’t have to install any extra pipe systems to counter that. While the inner side of the tank is made of the enamel steel, the outside of the tank is made of galvanized stainless steel which gives the tank extra sturdiness and durability.

The point of having an enamel tank is to increase its resistance to varying extreme temperatures. This model, hence, is a good choice if you are looking for an indirect water heater which can take high temperatures of heating. The interior tank area is well-protected from corrosion and scaling. The exchange system sometimes traps oxygen which further corrodes the material but because of the enamel coating, this doesn’t happen with this model.

The outer and inner tank are sound efficient and sturdy enough on their own but there is also an insulation layer in between the two. This insulation serves as a heat-preserving shield. The reason to make this is to reduce the heat loss per hour, which subsequently, increases the energy efficiency of the system. This way, you will be able to save a lot of money while paying your bills. The insulation in between is made of polyurethane foam which protects the internal tank even when the temperature is high. This also protects the external tank from getting damaged from the heat, the insulation is 100% free of any form of CFC’s.

When it comes to safety, this model is designed as an all out safe product. For added protection, this indirect water heater has 2 relieve valves. One releases the temperature while the other relieves the pressure. If at any point of time  there is an overloading occurring in the system, the heater is designed to release the extra pressure and excess heat through these two valves, hence protecting the whole system from crashing and causing fire hazards. The valves lead to two drain pipes which take these hazardous factors away from the machine.

This indirect water heater also comes with a magnesium anode. This further protects the system from corrosion, regular rusting and saves the heater from damages caused by hard water. The AB 401C is among the best 40 gallon indirect water heater.

Main features

  • Water tank size: 38.6 gallons (approx) which can support your whole family
  • Working water pressure is 101.45 psi
  • It has a very elegant white finish
  • Heat energy output: 8.530 BTU
  • Product weight: 176 pounds
  • Product dimensions: 54H x 21D inches

Advantages

  • Its highly durable and sturdy and protective against scales and corrosion
  • Enamel steel graded design is state of the art
  • It can withstand high temperatures
  • It is highly resistant to surface damages

If you live somewhere cold and you need a highly efficient indirect water heater, then the AB IWH401C Indirect Hot Water Heater should be your choice. Check out some Burnham indirect water heater reviews to get a good idea about these appliances

Crown – 50 gallons – MS2 – Indirect Water Heater

Crown Mega Stor II Indirect Water Heater

The world is changing. More and more people are becoming aware of the necessity to invest in appliances which are energy efficient, yet durable. The new models of indirect water heaters serve both of these necessities. Do you have a large family? But you don’t want to invest in more than one water heater? In earlier years, a large capacity water heater meant a hole burnt through your pocket when it came to paying the electricity bills. Times have changed and it’s the age of modern indirect water heaters.

If you are looking for a residential-built water heater which can handle large capacity volume, then you should definitely go for the Crown MS2 Indirect water heater.

This Crown 50 model is an fired indirect water heater. It is a vertical water heater and it comes with a Honeywell aquastat which is adjustable. The brand clearly speaks for itself.

With the capacity of a whopping 50 gallons, this indirect water heater can cater to big families on a large scale. But don’t think that because it is handling water at this capacity, that its delivery rate is slow. It is fast and efficient, in spite of the volume of water it manages. The heater makes use of the power which is created at the boiler which makes its highly energy efficient and power-saving. The tank is made of stainless steel. The model is exclusively made for use in residential homes who have high usage in terms of frequency and umber and duration.

Under the main unit, there is a coil made of stainless steel. This helps the heat spread out evenly throughout the indirect water heater tank. This in turn decreases the recovery rate as well. This is great as the rates here are much better than the rates you get from water heaters which run on electricity or gas.

The heat loss this model makes, per hour, is only 0.85 to 0.90 degrees Fahrenheit. There is a thick insulation made of foam polystyrene. This helps in increasing the age of the unit, even if it is used a lot, quite often, or left on for a long time. You don’t have to worry about overheating, corrosion or fire hazards.

The body of this indirect water heater is made of 444 graded stainless steel. It is coated with a tough steel jacket. It is a very sturdy and a heavy-duty model. For extra protection, it also comes with efficiently tough polymer caps. Whether it be the heat or structural damage or general wear & tear of dents or erosion, this model can take it all. It is also designed to resist cracks on the inside which can occur due to heat, in older models.

Maintenance is easy. You can remove the cover and check on the inside when you want and clean it up as you do so. As mentioned earlier, this is a vertical model and it also comes with adjustable legs. If you have uneven surfaces or want to move it to a new area, then these adjustable legs come in handy.

Certified by AHRI, this indirect water heater is high in terms of durability, performance, energy saving and follows all the regulations needed in terms of standard heating, refrigeration and air conditioning. The indirect hot water tank prices justify themselves with their quality and affordability scores.

Main features

  • Water tank size: 49.5 to 50 gallons but weighs only about 100 pounds.
  • First hour rate: 161 to 497 GPH
  • Heat energy output is: 122.000 BTU
  • It comes in a variety of colors
  • Water working pressure: 150 psi
  • Product dimensions: 49.75H x 23.5D inches
  • Product weight: 100 pounds

Advantages

  • It is made of highly durable materials
  • It can manage a huge capacity
  • It has reduced loss of heat capacity
  • Its flow rate is constant and high

For a big family home, this would be your best choice, in terms of modern indirect water heaters.

Triangle Tube SMART80 Indirect Water Heater

Triangle Tube Smart80 Indirect Water Heater

Looking for an efficient indirect water heater which suits your modern home? Do you live in a large joint family? Are you concerned about energy efficiency and pressure droppings of indirect water heaters? If the answer to all this is yes, then you should go for the Triangle Tube Indirect SMART80 water heater.

Like the previous model, the Triangle Tube Indirect SMART80 water heater is also a fired water heater. It guarantees great efficiency and is known to have a very low pressure drop amongst all models in the market right now.

It comes equipped with a capacious heater and has a 2- tank or tank-within-tank system. This helps the model survive high temperatures without getting damaged. It also protects the tank and overall system from bacteria and mold growths. The tank on the inside is made of stainless steel. Which makes it resists hard water. Say goodbye to the troubles of requiring to install extra new anode rod pipes to counter that problem.

The heated water is stored in between the external and the internal tank. It is designed as a typical wrap-around exchanger which helps in better heat exchange. The boiler water is taken by the external or the outer tank and circulated all around the internal or the inner tank. The water on the inside is, hence, heated up in a quick and efficient manner, while saving energy.

After this is done, the water present in the outer tank is taken back again to the super boiler in order to reheat it. There is a pre-set mark assigned which automatically shuts down the inner tank’s circulator and boiler once that unit is reached.

It has a capacity of approximately 84 gallons and this indirect water heater can provides for families which are big, regardless of the usage and the duration it is used for. The model is designed in a way which handles all these factors.  With a capacity of 70 gallons in general, a 14-gallon extra capacity is added for the heating which helps in maintaining the water supply consistently.

With 84 gallons of volume, this indirect water heater creates a huge home capacity of hot flowing water giving the users a consistent supply of water. The 70 gallons is the basic capacity and 14 gallons is the additional tank added to the heater.

This model of modern indirect water heater comes with a self-cleaner exchanger. This means less labor for you. The steel cover has an outer surface of around 28 feet. The material is resistant to rusting and the heat exchanger is designed in a way that it can de-scale on its own. Water damages and rusting are a thing of yesterday, thanks to this modern design.

There is a foam insulation present between the two tanks. It’s made of a thick polyurethane material (2-inches). This means that even if you use the heater for extended periods of time, it won’t become a fire hazard or get damaged. Even when the water heater is kept on a standby, it won’t get into any kind of trouble, because of this kind of insulation. The continuous flow of hot water can handle 4000 gallons at 200 degrees Fahrenheit in an hour

The Triangle Tube water heater is rated high by its buyers and users have reported high satisfaction levels with their purchase.

Main features

  • Water tank size: 70 + additional 14 gallons tank
  • Water working pressure is: 150 psi
  • It comes with a 460 GPH first hour rate
  • Heat energy output is: 300,000 BTUs
  • It comes in various different colors which you can pick from
  • Product weight: 270 pounds.
  • Product dimensions: 61H x 26D

Advantages

  • It comes with a tank-within-tank design.
  • As compared to older regular heaters, it has a faster recovery rate triple faster, to be precise
  • Temperature is automatically reduced when the system is on standby
  • The exchange surface is self-cleaning in nature
  • It gives the user flow of continuous flow of hot water

If you are impressed by all these features, get yourself a Triangle Tube SMART80 Indirect water heater today. It’s better than a electric tankless water heater.

Amtrol WX 302 Indirect water heater

Amtrol Indirect Water heater

The Amtrol WX 302 indirect water heater from Amtrol is one of the best indirect water heaters. It has a sleek blue glossy finish and is great when it comes to energy saving. This model has a 86-gallon tank capacity and is high performing in nature. The tank is a bimodal tank which means that it is made of HDPE which is a high-density polyethylene. The reason for this, is to make the base of the apparatus highly durable and sturdy.

When it comes to choosing the best indirect water heater, as mentioned before you have to keep several factors in mind, like the size of your family, usage stats, the hourly heat loss ratings of the model, durability factors, capacity and others. When it comes to this model of indirect water heater, all these points get checked. It caters to the needs of families of small to big sizes and its extremely efficient in many other ways.

If you live in an area where hard water supply is there, don’t worry. With the Amtrol WX 302 indirect water heater, you don’t have to install any anode rods separately. The tank is designed to automatically handle hard water without facing corrosion. Along with this, it is built in such a way that it can resist rusting in all areas. It supports very high temperatures up to 180 degrees Fahrenheit and its tank is built in a way that it only delivers clean and fresh water at all times.

The amount of lead used to make the tank is low, which is always preferable. The tank stands on a stand made out of steel and has an outer covering which is the deep-drawn protection shell. This protection shell is also made of stainless steel which is not seen in older designs. This makes the shell almost 2 times harder and stronger, providing double protection. The base of this apparatus comes with additional protection as well.

This indirect water heater has a special urethane insulation. This gives it more durability as the seal is tighter on the tank and the shell as well. The heat loss per hour is, hence, reduced to a great amount, in turn making it one of the most energy efficient indirect water heaters that are out there.

In order to use less power, the heater uses the energy present in the boiler system itself. The overall output of the heater is thus, increased.

The maintenance is easy when it comes to the Amtrol WX 302 Indirect water heater. You can remove the coil inside and clean it up once in a while. The top mount construction is designed in such a way that temperature transfer is handled more efficiently. This means that your water will actually get heated faster than expected.

This top mount construction also saves you a bunch of money and time because you don’t need to purchase and install any additional utility connections. As compared to regular water heaters, all these factors, makes this heater more energy efficient than ever. You can also choose a “double wall” option but you would have to check with your area code first, in order to purchase and install that.

The mechanical aquastat is user friendly and you can adjust the heater as per your requirements at home. The storage buffer is present so that this indirect water heater can cater to large families as well. The exchanges system ensures that a large volume of water can be handled, at high temperatures, all together proving you with heated water quickly and efficiently. Some of the Burnham indirect water heater reviews are very helpful and can help you get and idea of these appliances better.

Main features

  • Water working pressure: 150 psi
  • Water tank capacity: 41 gallons
  • The first hour rate ranges from 89 to 170 gallons
  • Heat energy output: 100,000 BTUs
  • Product weight: 124 pounds
  • It comes in a glossy blue color
  • Product dimensions: 48H x 22D inches

Advantages

  • It has a continuous and effectual flow rating
  • It’s easy to maintain and clean
  • It’s extremely energy efficient
  • The tank is made of hard and durable material
  • Will save you a lot on your electricity bills
  • It can handle high temperatures

Now that you know that this is one of sturdiest and most efficient indirect water heaters, what are you waiting for? Make your purchase today.

The Conclusion & FAQs

  • What are indirect water heaters?

An indirect water heater is a heater which uses a boiler or a furnace or heat water. This water is circulated through a heat exchanger which is inbuilt in the appliance and then takes it to an inner tank. The energy is taken from the inner tank and the boiler. This makes the indirect water heaters extremely energy efficient.

  • Are indirect water heaters better in terms of efficiency?

Most definitely. Even though an indirect water heater may seem more bulky than traditional water heaters, it is better in other ways. In terms of handling high temperatures, high volumes and hard water resistance and over durability, indirect water heaters are much more efficient. They also are better when it comes to energy saving. They last longer and require very little maintenance.

  • Is purchasing an indirect water heater worth the money?

If the families are big (with more number of people) and the number of times they use a heater or the duration for which they use a water heater is a lot, then indirect water heaters are a must have. You can use these heaters for years and save a ton of money because they are so energy efficient. These indirect water heaters come with boiler systems. The inner tank is insulated with a thick polyurethane material which reduces the heat loss per hour. This helps in the usage of less amount of energy, in turn. Thus, it requires less-reheating as well and gives the user a very regular and constant flow of hot water at all times. Temperature consistency is one of the best features of modern indirect water heaters.

  • Why are these modern indirect water heaters so expensive?

For an indirect water heater price, it’s a bit on the high side. The materials used in making indirect water heaters are of high quality, hence the high price. As compared to old models of water heaters, these heaters ate extremely efficient in terms of energy savings, and durability. They have stainless-steel material present on the tanks and some come with a coil at the bottom which lasts for even 30 years. The designs are made in a way that the user wouldn’t have to work hard on maintaining it and the these water heaters are perfect to go with practical and aesthetic requirements of modern homes. Because of all these factors, the indirect water heater prices are bit on the high side.

  • What is the function of an indirect water heater?

The difference between indirect and direct water heater is that in the case of indirect water heaters, direct electricity is not used. Heat transfer is done instead with the help of the exchanger system, present in the machine. It has a tank, a ring gasket and plumbing connection all with an in-built sealing system. Keeping all these things in mind, it was designed to be efficient and use less energy overall. What can be better than an appliance which helps in reducing our carbon footprint? Tankless water heaters are also available and the prices are higher compared to indirect water hot water tank prices.

  • How do these modern water heaters work?

In most indirect modern water heaters, the usage of electricity is not required. There is a heat exchange system which helps in heating the water in the inner tank. There is a special fluid present which absorbs heat from one surface to another. This is even better than systems which use gas as a source of water heating. It’s easier on the environment and saves money. There is a coil which is present at the bottom of the machine. This helps in distributing heat evenly. Hence the water gets heated quickly as well and the flow of warm water is consistent.

A boiler or furnace is used as the source of heat. Most modern water heaters use a boiler these days and they are better in terms of efficiency as well. It doesn’t require a venting system. The boiler itself can use solar power or gas as a main source of energy.

  • Why does one need an indirect water heater?

Who doesn’t like saving money? As mentioned earlier indirect water heaters don’t use gas or electricity and hence its easier on the environment and more energy efficient. It helps us reduce our carbon footprint. The maintenance is minimal and water is heated up quickly no matter how large is the tank capacity of the system. Also, it is built of very durable material which saves the appliance from corrosion and microbial growth. Gas efficient boilers have an efficiency of up to 96%.

  • How many years can one use a single indirect water heater?

The life span of these water heaters lasts a lifetime. The coil itself lasts for 30-40 years at a go.

  • What is the cost of these modern water heaters?

If you include purchase, transport and installation, you would have to spend around 800 to 1500 dollars. A tankless water heater is a bit more expensive, say about 3000 dollars.

  • Do indirect water heaters save money?

Yes, of course, since these heaters don’t use gas or electricity directly, they are very energy efficient.  The energy coefficient is based on the heat loss per hour which is low for all these modern designs as compared to older models.

  • What size water heater should you go for?

If you are a regular nuclear family, a 35 to 45-gallon water heater should be good enough. A boiler takes up high number of BTUs which makes it capable of handling high temperatures.

  • What size water heater should be good enough for a family of 4?

For a family of 4, a 45 to 75-gallon water heater should suit all your needs. You can use it for as long as you need and even keep on standby without having to worry.

  • How to install an indirect water heater?

There is not much difference in the installation of indirect water heaters and direct water heaters. Just that in case of indirect water heaters, you don’t need to install extra rod pipes to tackle hard water damages. Just make sure that the PVC pipes you buy are of good quality and that the electrical wiring has good insulation.

  • How should you do the wiring for your modern heater?

Wiring is an important installation step. Make sure the main power switch and main water supply is OFF before you start working. Set the level of the water heater and the boiler tap should be connected to the heater efficiently through the coil. The heat exchanger and boiler need to be connected with a copper wire. Sludge removal can be done by connecting a filter under the ball valve. Solder all copper connections with a propane torch.

  • Do these indirect heaters need anode rods?

Some come pre-installed with anode rods and some don’t need it at all. In summary, no, you don’t have to install anything separately.

  • How to clean your modern water heater?

Most basic cleaning agents should be safe. Make sure that its not too acidic in nature or the metal surfaces will waste away slowly. Neutralize the ph level of whatever cleaning solution you are using. Check the coil for impurities and clean it if your water is hard water.

  • How to replace an change an indirect water heater?

The water which you replace should be of the same make and type of the one used before. For replacement, you would need to break into the machine so it’s best to get it done professionally.

 

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Annie Ryan

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