Steam Boiler vs Hot Water Boiler – Which One Is Better?


Choosing the right boiler can often be challenging. Due to the flooded market, an inexperienced person can easily get overwhelmed. The two popular options in the market are a hot water boiler and a steam boiler. Although the two share some similarities, they have various critical differences. 

We have picked the decisive factors to decide the best option for your needs. In this steam boiler vs hot water boiler, we will cover everything, including the basics, differences, advantages, and demerits of both. So, let’s get into it!

What is Steam Boiler?

A steam boiler is a type of boiler used for converting fluid into steam. Generally, this is done by heating the water. It is the type that mostly pops up in people’s minds when they hear the word ‘boiler.”

It has a heat exchanging system consisting of several tubes. A water container and combustion chamber are the two main components of a conventional steam boiler.

As the name suggests, the primary purpose of this boiler is to produce steam. Its main use is to produce heat or steam for commercial as well as industrial applications.

However, these boilers are also known as power generation devices. That’s because they can generate electricity and help in chemical manufacturing. In many industries and refineries, steam boilers are used for creating and purifying paper.

Steam boilers are equipped with a closed vessel that can be used to create vapor. They typically offer an efficiency rate of 80-88%, depending on several conditions. A steam boiler can be categorized into many types. However, its two primary classifications are firetube and watertube boilers.

What Is Hot Water Boiler?

Although hot water boilers are often confused with ordinary boilers, they are not. They are specifically used for producing heated water, not steam. They are equipped with hydronic systems to increase the given water temperature. These boilers make sure that the heated water circulates through buildings efficiently.

When comparing steam boiler vs hot water boiler, one should know the hot water boiler’s applications. This type is pretty common for light commercial and household usage. Their primary purpose is in winter to obtain warm water. They are common in small to medium industries for their basic purpose.

Hot water boilers are sometimes confused with water heaters. They have some similarities but different working mechanisms. A hot water boiler includes a thermometer, pressure gauge, thermal expansion, and temperature controls. It also has an automatic low-water fuel cutoff as one of its main components. 

Operating a hot water boiler is quite simple. It usually comes with temperature controls with a specific limit. You can set it depending on the temperature outside.

This way, it can provide you with the perfect water temperature. Due to their convenience, they are also used in HVAC systems in industrial and commercial buildings. They are easy to operate and offer an effective solution, especially in cold weather.

4 Key Differences About Steam Boiler vs Hot Water Boiler

Usually, the topic in debate for steam boiler vs hot water boiler is which one is better. However, there’s no easy way of telling that. The first thing to know is the difference between a steam boiler and hot water boiler.

We have collected the 4 key factors to end the “steam boiler vs hot water boiler which is better” debate. Let’s take a look at them in detail:

1. Working Mechanism

The first and foremost thing to point out in steam boiler vs hot water boiler is the working mechanism. A steam boiler has a combustion chamber and fluid (water) container. It uses evaporation to produce steam in the form of condensation. 


In contrast, a hot water boiler uses the conventional heat exchange method. These boilers have a built-in heat exchanger to increase the water temperature. They also have controls to adjust the temperature according to your needs.

2. Efficiency

Hot water boilers are not very efficient. That’s mainly due to their simple build and purpose. They are designed mostly for domestic or small industrial purposes. However, their efficiency can not be calculated to a specific percentage. 

On the other hand, steam boilers are comparatively more efficient. Since they work mainly on steam, there’s barely any resistance. The only thing that can negatively impact is the cooler spots in your building. Even after that, the boiler manages to achieve 80 to 88% efficiency, depending on the weather. 

3. Build and Components

One thing to know about industrial steam boiler vs industrial hot water boiler is that they both look pretty distinguishable from each other. Their different components set them apart.

Hot water boilers are known for their traditional design. It includes a thermometer, temperature controls, and a pressure gauge. In some boilers, it is also known as the altitude gauge. 

On the other hand, a steam boiler has a simple design. It only has two primary components: a container and a combustion chamber. The latter is where the evaporation process occurs. In contrast, the container is used for storing and circulating the fluid, typically water.

4. Maintenance

Maintenance also plays a vital role in determining the best option in steam boiler vs hot water boiler. Steam boilers require more frequent care as they have a comparatively complex build.

Their components are more vulnerable to corrosion and scaling, resulting in a shorter lifespan. Also, these factors can make your steam boiler less efficient than before. The best way to prevent this is by regularly inspecting the pressure, temperature, and water levels. 

Hot water boilers also require regular maintenance but less than steam boilers. The main concern with these boilers is the temperature and pressure. It is recommended to monitor these levels to avoid bigger problems.

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Other Differences

Here are a few other differences you should know about steam vs hot water boilers

1. Heating Capability

Steam boilers have a greater heating capability than hot water boilers. They can reach higher temperatures and get the job done more efficiently.

2. Applications

A hot water boiler is generally common for domestic uses, but its heavier models can be used for commercial uses and in industries. In contrast, steam boilers are known for their commercial and industrial use, thanks to their higher efficiency. 

3. Initial Cost

Steam boilers are typically more expensive due to their higher efficiency and industrial applications. At the same time, the size of a boiler plays an important role in determining its initial cost. 

4. Safety

Hot water boilers are safer to operate due to their lower heating capability. They can not be operated at higher temperatures like a steam boiler. 

5. Water Levels

Steam boilers do not require a higher water level to work efficiently. But that’s not the case with hot water boilers. They need you to maintain proper water pressure.

Advantages and Disadvantages Of Steam Boiler

We have listed the steam boiler vs hot water boiler pros and cons to make the choice easier for you. Let’s start with the benefits and drawbacks of a steam boiler to provide you with a clearer picture:


  • Steam boilers are very efficient because of their lower resistance. The only thing that can affect their efficiency is cold within the system. 
  • A steam boiler works faster than many other boilers. That’s due to its capability to reach higher temperatures.
  • A steam boiler is more cost-effective, but their installation and purchase can be quite costly.
  • Steam boilers are useful in all areas, including commercial buildings, industries, and in households.
  • These boilers do not require a specific water level to work effectively.
  • A steam boiler has a straightforward working mechanism.


  • Steam boilers have a high initial cost of installation, depending on their efficiency and size.
  • They are not very safe due to their higher heating capacity.
  • Their components are prone to corrosion and scaling, reducing the efficiency and lifespan of the entire boiler.

Advantages and Disadvantages of Hot Water Boiler

If you are comparing a steam boiler vs a hot water boiler, it is important to know that a hot water boiler has some merits and demerits. Let’s look at both of them for a better understanding.


  • Hot water boilers are easy to operate and manage.
  • They do not require frequent maintenance.
  • A hot water boiler is significantly safer thanks to its lower heating level.
  • These boilers are highly efficient for domestic purposes, like laundry, showers, and cooking.
  • Their simple build can enable even an inexperienced person to understand the boiler. 
  • Their initial price and installation are comparatively cheaper than steam and many other types of boilers.


  • Hot water boilers need a proper water level. Otherwise, they might not work as effectively.
  • They operate at a low temperature, making them less effective and more time-consuming.
  • These boilers have limited applications as they are not primarily suitable for heavy-duty applications.
  • While they have a low initial price, they are comparatively less cost-effective and energy efficient.

Conclusion – Which One is Better?

And that’s all you need to know about steam boiler vs hot water boiler. Both boilers have their strengths and weaknesses. The steam boiler is more efficient but not very safe.

Alternatively, a commerical hot water boiler is fairly easy to understand and operate but has certain limitations. It depends on your requirements to determine which is better for you. If you want a boiler to produce hot water, go for hot water boilers.

However, if you want a boiler for producing steam, a steam boiler is the only option. Additionally, both types have different purposes and applications. Both of these boilers are available in many different sub-types, efficiency levels, sizes, etc. Thus, reviewing your requirements to determine the best fit for your needs is best. 

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