Pressurized vessels are industrial equipment specially manufactured to withstand the effects of pressure, containing liquid or gas under a certain pressure. These systems are widely used in functions such as heating, cooling, storage, or energy transfer. Especially in industrial facilities, hotels, power plants, and large-scale buildings, pressurized vessels ensure the safe heating and storage of water or other fluids.
The main feature of pressurized vessels is their resistance to high temperature and pressure. Therefore, high-quality steel, enamel, or stainless materials are used in their production. During the production phase, sealing, welding strength, internal surface coating quality, and pressure tests are of great importance. Otherwise, serious safety risks may arise in these systems operating under high pressure.
The most commonly used products in the pressurized vessel category include boilers, accumulation tanks, and buffer tanks. Although each has similar structural features, their purpose of use and function in the system differ:
• Boilers: Heat and store domestic water.
• Accumulation tanks: Store heat energy, balance temperature changes.
• Buffer tanks: Increase water volume in cooling systems to ensure system stability.
All these vessels are indispensable elements in modern installations to provide energy efficiency and extend system life. Especially the pressurized vessels produced by the MIT brand are both long-lasting and hygienic thanks to their high insulation density, quality enamel coating, and advanced production standards.
Pressurized vessels are equipment at the heart of heating, cooling, and energy storage systems that directly affect energy efficiency. However, not every pressurized vessel serves the same purpose. Boiler, accumulation tank, and buffer tank systems may look similar but differ in terms of working principles, usage areas, and technical features. Understanding these differences is extremely important for using the right product in the right system.
What is a Boiler and What Does It Do?
A boiler is a pressurized vessel designed to heat and store domestic water. It typically contains a pipe system called a coil. This coil transfers the heat it receives from an external heat source (such as a boiler, solar energy panel, or heat pump) to the water. Thus, the boiler ensures the continuous and hygienic supply of hot water.
It is preferred in many areas from residences to hotels, gyms to industrial facilities. The main advantage of boilers is that they can instantly respond to sudden hot water needs by pre-heating and storing domestic water.
Boilers produced by the MIT brand are long-lasting, efficient, and safe thanks to their double-layer hygienic enamel coatings, cathodic protection systems, and high-density polyurethane insulations.
What is an Accumulation Tank?
Accumulation tanks are equipment produced to store excess heat energy in a system and reuse this energy when needed. Unlike boilers, they do not directly heat water but balance the heat in the system to prevent temperature changes.
For example, in systems operating with solar energy, excess energy produced during the day is stored in the accumulation tank and used to provide hot water when there is no sun. This increases system efficiency, reduces energy losses, and provides a more stable temperature.
Accumulation tanks are generally produced without coils. In other words, the heating of the water is realized with an external source. This distinguishes them from boilers. Additionally, their internal surfaces are coated with enamel or epoxy paint to make them resistant to corrosion and hygienic.
Usage areas include HVAC systems, renewable energy facilities, central heating applications, and hotel systems. Especially in cases where boiler capacity is insufficient, adding an accumulation tank to the system increases performance.
What is a Buffer Tank?
Buffer tanks are pressurized vessels typically used in cooling systems to increase water volume and ensure stable operation of chiller systems. These tanks maintain the thermal balance of the system and prevent chiller devices from frequently turning on and off unnecessarily. Thus, energy savings are achieved, and the device's lifespan is extended.
Buffer tanks can also be used in heating systems. The purpose is to reduce the frequency of system activation, maintain a constant heat level, and create a comfortable temperature balance. Although they seem similar to accumulation tanks in this respect, the most distinctive feature of buffer tanks is that they are specifically designed for cooling applications.
MIT-produced buffer tanks are made of high-quality steel and are available with or without baffles upon request. In baffled buffer tanks, the flow direction is adjusted to increase thermal efficiency. All surfaces are protected with epoxy paint or galvanization.
What is a Single Coil Boiler?
A single coil boiler is a pressurized vessel designed to heat and store domestic water, containing a single coil inside. This coil is the main component that transfers the energy received from the boiler's heat source to the stored water. In short, it acts as a heat exchanger that efficiently transfers the heat energy in the system to the water.
It is generally used in systems with a single heat source (such as a boiler, solar energy system, or heat pump). With its compact structure, easy installation, and energy efficiency, it is preferred for hot water production in both residential and commercial buildings.
Working Principle
In single coil boilers, the hot fluid coming from the heat source passes through the coil, transferring its heat to the water in the storage tank without coming into contact with it. During this process, energy loss is minimized.
The coil system starts from the bottom of the tank and spirals upward, ensuring that the heat is evenly distributed throughout the water.
This allows the water in the tank to reach the desired temperature quickly and remain at a constant temperature during use. This structure provides a great advantage, especially in systems aiming for high efficiency and low energy loss.
Structural Features of Single Coil Boilers
Single coil boilers produced by the MIT brand combine long-lasting use and high hygiene standards. Thanks to the materials and surface treatments used in production, both internal and external durability are at excellent levels.
• Material Quality: MIT boilers use Ereğli TRKK 6222 low-carbon steel sheet suitable for enamel coating. This material eliminates the risk of deformation under high temperature and pressure.
• Enamel Coating: Internal surfaces are coated with double-layer hygienic enamel. This coating is 200–250 microns thick and provides superior resistance to corrosion.
• Cathodic Protection: Zinc anode is used in the system to prevent rusting of the internal surfaces. Thus, the surfaces in contact with water remain hygienic for many years.
• Insulation: Polyurethane insulation has a density of 42–44 kg/m³. This density value minimizes heat loss while increasing energy efficiency.
• Outer Shell: Models between 100–600 liters use electrostatic powder paint over galvanized sheet, while models between 800–6000 liters use a special Winlex shell. Both applications provide an aesthetic and durable appearance.
• Pressure Resistance: All single coil boilers are resistant to 10 bar operating pressure and are subjected to high-pressure tests via SRM pipes after production.
Capacity Range and Technical Diversity
MIT Single Coil Boilers are produced in different volumes ranging from 100 liters to 6000 liters. This wide capacity range offers suitable solutions for all kinds of applications, from small residences to large hotel facilities.
• Small volume (100–600 L) boilers are generally intended for individual use.
• Medium volume (800–1500 L) boilers are preferred in apartment-type systems.
• Large volume (2000–6000 L) boilers are used in central hot water systems.
Advantages of Single Coil Boilers
Single coil boilers are one of the most preferred systems for many years due to their simplicity and efficiency. The main advantages provided by these products are:
• Energy Efficiency: The single coil structure optimizes heat transfer. The entire water is heated homogeneously, and energy losses remain at a minimum level.
• Compact and Durable Design: Takes up little space, is easy to install, and offers high mechanical strength.
• Hygienic Use: Thanks to enamel coating and cathodic protection, internal surfaces remain clean and healthy for many years.
• Long Life: Thanks to polyurethane insulation, surface coating, and stainless connection elements, the product life can exceed 15–20 years.
• Economic Solution: Since it works with a single heat source, installation costs are low, and maintenance needs are minimal.
Usage Areas
Single coil boilers are widely used in the production of hot domestic water in residences, hotels, factories, hospitals, sports facilities, and schools. It provides high efficiency, especially in solar energy or boiler-supported systems.
Additionally, it can be integrated into the primary circuit in heat pump systems, providing both energy savings and uninterrupted hot water supply.
The Difference of MIT Quality
In MIT's production process, quality control is at the highest level. Each boiler undergoes a double bathing surface cleaning process before enamel coating. This ensures that the coating adheres perfectly to the surface and provides long-lasting protection.
At the end of production, each product undergoes pressure tests, insulation measurements, and paint thickness checks. As a result, MIT Single Coil Boilers offer not only high performance but also a guarantee of safety, hygiene, and durability.
What is a Double Coil Boiler?
A double coil boiler is an advanced pressurized vessel that can use more than one energy source simultaneously or alternately to heat domestic water. The most distinctive feature of these boilers is that they contain two separate coils.
Each of these coils can be connected to a different heat source. For example, the lower coil can be fed from a solar energy system, while the upper coil can be fed from a solid fuel boiler or natural gas boiler system. Thus, when solar energy is insufficient, the system automatically continues to produce hot water from the second heat source.
This structure provides both energy efficiency and guarantees the continuity of hot water. Double coil boilers are widely preferred today, especially in hotels, residence projects, hospitals, sports facilities, and large apartment systems.
Working Principle
Double coil boilers have two separate heat exchanger pipe systems. One of these coils is usually located at the bottom of the tank, while the other is at the top.
The lower coil uses the fluid coming from an energy source operating at low temperature (such as a solar panel or heat pump). This fluid pre-heats the stored water as it passes through the coil.
The upper coil is connected to a second energy source (such as a boiler or central heating system) and ensures that the water reaches the desired final temperature.
The coordinated operation of these two coils makes the system both environmentally friendly and economical. During sunny days, most of the energy need is met from the sun, while during cloudy or high-demand periods, the second source automatically comes into play. Thus, while energy savings are achieved, the user never compromises on hot water comfort.
Structural Features of Double Coil Boilers
Double coil boilers produced by the MIT brand offer both durability and high efficiency. Thanks to the materials used in the production process, coating technologies, and quality control stages, long-lasting, hygienic, and reliable products are produced.
• Steel Quality: The boiler body is made of high-strength Ereğli TRKK 6222 low-carbon hot-rolled steel sheet. This material maintains its form even under high pressure.
• Enamel Coating: All surfaces in contact with water are coated with double-layer enamel. This coating, 200–250 microns thick, provides excellent protection against corrosion and bacterial formation.
• Double Coil System: The coils are made of steel with high conductivity and are optimized to provide maximum heat transfer.
• Cathodic Protection: As with all boilers, magnesium anode rods are used in double coil models to prevent rusting of the internal surface.
• Insulation: Thanks to polyurethane insulation (42–44 kg/m³ density), heat loss is minimized. In large volume models, special sponge insulation and Winlex outer shell are used.
• Outer Coating: Models between 160–600 liters have an electrostatic powder-coated shell over galvanized sheet. In products between 800–6000 liters, the Winlex shell is preferred.
• Pressure Resistance: It works safely under 10 bar operating pressure for many years. Each product is subjected to high-pressure tests after production.
Capacity Range
MIT Double Coil Boilers are produced with different capacity options ranging from 160 liters to 6000 liters. This wide capacity range allows them to be applied in both individual systems and central facilities.
Small volume products are suitable for individual use, while large capacity models are preferred in hotels, factories, or mass housing projects.
Advantages of Double Coil Boilers
Double coil boilers are among the smartest hot water solutions today in terms of energy savings and system efficiency.
They have a much more flexible and environmentally friendly operating system compared to single coil models.
Main advantages:
• Ability to Use Two Different Energy Sources: Can work simultaneously with solar energy, heat pump, or boiler systems.
• High Energy Efficiency: During periods when solar energy is sufficient, electricity or fuel consumption is minimized.
• Continuous Hot Water Supply: When one energy source is out of service, the other comes into play; the system never stops.
• Long Life: Thanks to enamel coating, cathodic protection, and insulation features, products work without problems for years.
• Hygienic Use: Enamel coating of the internal surface prevents bacterial formation.
• High Pressure Resistance: Provides safe operation under 10 bar operating pressure.
• Aesthetic and Durable Outer Surface: Powder paint or Winlex shell coating increases the visual quality of the product while providing protection against environmental effects.
Usage Areas
Double coil boilers are widely used, especially in systems supported by renewable energy.
The most common areas of preference are:
• Hotels and accommodation facilities
• Sports complexes and swimming pools
• Hospitals, schools, and mass housing
• Solar energy supported heating systems
• Central hot water facilities
These systems provide both sustainable energy use and significantly reduce operating costs.
Double Coil Boilers with MIT Quality
MIT is a pioneer in the sector in terms of both engineering and quality in the production of double coil boilers. All products are produced in Turkey, undergoing high-precision welding technology and enamel coating processes.
Each product is verified with leak tests, enamel adhesion controls, pressure tests, and insulation thickness measurements.
The resulting product is a hot water system that provides both energy savings and long-lasting, reliable operation.
What is an Electric Boiler?
An electric boiler is a pressurized vessel that does not contain a coil and uses electrical energy to heat water. While the heating process in traditional boilers is usually provided by an external heat source such as a boiler, solar energy, or heat pump, in electric boilers, this task is performed by stainless steel resistors.
In other words, the system directly converts the electrical energy it receives from the grid into heat energy through resistors and heats the stored water.
Electric boilers are the ideal solution to meet the hot water needs, especially in buildings without a heat source or in structures without a central system connection. In addition, with its low energy consumption, easy installation, and maintenance-free structure, it offers practical use.
Working Principle
The working logic of electric boilers is quite simple but extremely efficient.
The stainless resistors inside the tank heat the water until it reaches the temperature determined by thermostat control. When the temperature reaches the desired level, the system automatically stops, and the water temperature remains stable for a long time thanks to insulation.
When there is a drop in the temperature of the domestic water or new cold water entry, the resistors are activated again. Thus, the continuous supply of hot water continues uninterruptedly.
In modern systems, smart thermostat and safety sensors ensure both energy savings and safety at the highest level. In electric boilers produced by MIT, these systems are supported by special control circuits against overheating and energy waste.
Structural Features of Electric Boilers
MIT Electric Boilers are manufactured with durable materials suitable for both residential and industrial use. Every part is designed with the goal of energy efficiency and long life.
• Resistor System: Made of stainless steel material, the resistors are resistant to high heat and provide long-lasting use.
• Tank Material: In body production, Ereğli TRKK 6222 low-carbon steel sheet suitable for enamel coating is used.
• Enamel Coating: The internal surface is coated with double-layer hygienic enamel with a thickness of 200–250 microns. This preserves the quality of the water and prevents bacterial formation.
• Cathodic Protection: The magnesium anode rod prevents rusting of the internal surface.
• Insulation: Polyurethane insulation (42–44 kg/m³ density) minimizes heat loss. This density value ensures that the water remains hot for a long time.
• Outer Coating: Products between 160–600 liters use electrostatic powder paint over galvanized sheet; products between 800–6000 liters use a special Winlex outer shell.
• Pressure Resistance: All models are resistant to 10 bar operating pressure.
Thanks to all these features, electric boilers are not only energy-efficient but also safe and long-lasting.
Capacity Range
MIT Electric Boilers are produced in a wide capacity range from 100 liters to 6000 liters.
Small volume models are generally suitable for individual residences and offices. Medium and large volume models are used in environments where hot water is continuously consumed, such as hotels, restaurants, factories, hospitals, and sports facilities.
Advantages of Electric Boilers
Electric boiler systems provide great advantages, especially in structures where energy access is easy.
The simple structure of the system, low maintenance requirement, and ease of use make these products the primary choice for many facilities.
Main advantages:
• Easy Installation: Since it does not require an external heat source, system installation cost is low.
• Energy Efficiency: Thanks to modern thermostat control, energy consumption occurs only when needed.
• Hygienic and Quiet Operation: Enamel coating and cathodic protection ensure clean, healthy water supply. Resistors operate quietly.
• Compact Design: Takes up little space and can be easily installed in any environment.
• Low Maintenance Requirement: Since there are no additional components such as a boiler, pump, or heat exchanger, there is no periodic maintenance cost.
• Environmentally Friendly Use: When supported by renewable sources (such as solar panels), carbon emissions are reduced to near zero.
• Long Life: Thanks to polyurethane insulation, quality surface coating, and stainless resistor structure, it works without problems for years.
Usage Areas
Electric boilers are the most suitable solution in structures without a heat source or where the central system is insufficient.
They are widely used in the following areas:
• Small and medium-sized residences
• Summer houses and mountain houses
• Restaurants, cafes, offices
• Gyms and swimming pools
• Schools, hospitals, and public buildings
• Temporary hot water systems in industrial facilities
Additionally, they can work integrated with renewable energy to create a hybrid system. For example, energy from solar panels is used primarily, and electric resistors are activated when needed.
Technical Performance and Safety
MIT Electric Boilers offer top-level performance in terms of both energy savings and safety.
Each product is subjected to the following tests after production:
• Pressure Test: Durability test up to 15 bar level
• Insulation Thickness Measurement: Control of heat loss value
• Electrical Safety Tests: Verification of resistor and thermostat protection circuits
• Coating Thickness Measurement: Compliance of enamel and paint layers with standards
These tests guarantee that the product works safely and efficiently.
Electric Boilers with MIT Quality
The MIT brand combines durability, efficiency, and safety concepts in the production of electric boilers.
The stainless resistors, high-density insulation, and double-layer enamel coating used in the products provide hot water comfort without performance loss for many years.
Additionally, under MIT's quality control policy, each boiler is subjected to pressure, leak, and insulation tests before delivery.
As a result, MIT Electric Boilers offer maintenance-free, energy-efficient, and long-lasting hot water solutions for both individual users and professional facilities.
Working Principle of Accumulation Tank
The main task of the accumulation tank is to store the water circulating in the heating circuit.
This water is not for direct use; it is a temporary intermediate storage to maintain the energy balance of the system.
For example, when a heat pump or boiler operates continuously, it may produce more heat than needed. In this case, excess energy is directed to the accumulation tank. The system reuses this stored energy when needed.
This way:
• Energy losses decrease,
• The boiler or heat pump is activated less frequently,
• The lifespan of system components is extended,
• Thermal comfort is maintained throughout the facility.
It works similarly in solar energy systems:
When the energy from the sun is abundant during the day, this energy is stored in the tank. At night or in cloudy weather, this energy is used to meet the system's hot water needs.
Structural Features of Accumulation Tanks
Accumulation tanks produced by MIT are top-level engineering products in terms of both durability and energy efficiency.
The materials used in production are selected to provide long life and hygiene.
• Material Quality: The body is made of Ereğli TRKK 6222 low-carbon steel sheet resistant to pressure.
• Enamel Coating: Surfaces in contact with water have a double-layer enamel coating. This coating increases corrosion resistance and provides hygiene.
• Epoxy Paint Alternative: Epoxy paint can be applied instead of enamel upon request. Epoxy coating is more economical and protects the surface against corrosion.
• Insulation: Polyurethane insulation minimizes heat loss. With 42–44 kg/m³ density insulation material, energy efficiency is at the highest level.
• Outer Coating: Small volume models are coated with electrostatic powder paint over galvanized sheet, while large volume models are coated with a special Winlex shell.
• Pressure Resistance: All MIT accumulation tanks are tested to work safely under 10 bar operating pressure.
Capacity Range
MIT Accumulation Tanks are produced in a wide capacity range from 100 liters to 6000 liters.
This offers suitable solutions for both residential heating systems and industrial energy storage applications.
Small volume tanks are generally used in individual heating systems, while large volume models are preferred in hotels, factories, hospitals, and mass living areas.
Advantages of Accumulation Tanks
Accumulation tanks are an indispensable element in the world of installation engineering in terms of energy management and system balance.
The advantages provided by these systems can be summarized as follows:
• Energy Efficiency: Excess heat produced can be stored and used later, preventing energy waste.
• System Balancing: Prevents temperature fluctuations, provides a constant heat level.
• Equipment Lifespan: Equipment such as boilers, pumps, and heat pumps are activated less frequently, reducing mechanical wear.
• Renewable Energy Compatibility: Can work integrated with solar energy or heat pump systems.
• Hot Water Comfort: Provides ready water without the need for energy production at the time of consumption.
• Economic Operation: Fuel consumption decreases, operating costs decrease.
Thanks to these features, the accumulation tank is one of the most ideal solutions in terms of both comfort and sustainable energy management.
Usage Areas
Accumulation tanks can be used in a wide variety of sectors. The most common usage areas are:
• HVAC systems (heating-cooling)
• Solar energy systems
• Energy storage applications
• Agricultural and greenhouse heating systems
• Industrial heating and process systems
• Heat pump supported installations
• Boiler central heating systems
Especially in facilities such as hotels, residence projects, factories, and mass living areas where hot water is continuously consumed, accumulation tanks are key equipment that keeps the system balanced.
Accumulation Tanks with MIT Quality
MIT combines high material quality and advanced engineering understanding in the production of accumulation tanks.
All products are manufactured in Turkey on high-precision production lines.
Each tank is subjected to the following tests after production:
• Pressure resistance test
• Leak control
• Insulation thickness measurement
• Enamel or epoxy coating control
MIT accumulation tanks offer the advantage of long-lasting use, high energy efficiency, and hygienic water storage.
By maintaining thermal stability in the system, it both increases user comfort and optimizes energy consumption.
In short, MIT accumulation tanks are the sustainable solution partner of modern heating and energy storage systems.
Working Principle of Buffer Tank
The buffer tank slows down energy transfer by storing a portion of the cooled or heated water in the system and prevents sudden temperature changes.
Let's consider a chiller system:
When the cooling load decreases, the chiller has to frequently turn on and off. This leads to energy waste and equipment wear. However, when a buffer tank is added to the circuit, the water volume in the system increases, allowing the chiller to be activated at longer intervals.
The same logic applies to heating systems. Water heated by a heat pump or boiler system is stored in the buffer tank, and even when heat demand changes instantly, a constant temperature level is maintained in the system.
Thanks to this principle:
• Chiller or boiler systems are exposed to fewer start/stop cycles,
• Equipment lifespan is extended,
• Energy consumption decreases,
• More stable temperature values are obtained on the user side.
In short, the accumulation tank "stores heat," while the buffer tank ensures "thermal stability."
Therefore, the accumulation tank is generally preferred in hot water systems; the buffer tank is preferred in cooling applications.
Structural Features of Buffer Tanks
Buffer tanks produced by MIT are developed with the goal of long-lasting use and high efficiency.
The materials used in production, internal coating quality, and insulation system ensure safe operation in both heating and cooling circuits.
• Material Quality: Made of Ereğli TRKK 6222 low-carbon steel sheet. This material is resistant to high pressure and resistant to weld deformation.
• Internal Coating: Internal surfaces can be coated with enamel or epoxy paint depending on the purpose of use. Epoxy paint provides superior protection against corrosion, especially in cooling applications.
• Insulation: Polyurethane insulation (42–44 kg/m³ density) prevents heat loss and increases energy efficiency.
• Outer Coating: Electrostatic powder paint over galvanized sheet or special Winlex outer shell is used for large volumes.
• Pressure Resistance: Works safely up to 10 bar operating pressure.
• Baffled and Unbaffled Options:
o Baffled buffer tanks optimize heat transfer by regulating the direction of water flow.
o Unbaffled models are ideal for low-flow systems for natural water circulation.
All these structural features make MIT buffer tanks not only durable but also energy-efficient.
Advantages of Buffer Tanks
Buffer tanks offer great advantages in terms of energy efficiency and system lifespan. They provide energy optimization, especially in chiller systems, reducing operating costs.
Main advantages:
• Provides Thermal Balance: Prevents temperature fluctuations in the system, creating a stable working environment.
• Extends Equipment Lifespan: Prevents the frequent activation of chiller or boiler systems.
• Provides Energy Efficiency: Energy consumption decreases with fewer start-stop cycles.
• Quiet and Balanced Operation: No noise or vibration occurs in the system during sudden water demand or temperature changes.
• Installation Flexibility: Can be used in both heating and cooling circuits.
• Easy Maintenance: Works for many years without requiring maintenance due to its simple structure.
With these features, buffer tanks are preferred especially in buildings requiring high comfort such as residences, hotels, hospitals, factories, and business centers.
Usage Areas
Buffer tanks have a very wide range of uses.
The most common usage areas are as follows:
• Chiller systems (chilled water applications)
• Heat pump systems
• Boiler-supported heating circuits
• Central HVAC systems
• Energy recovery systems
• Industrial process cooling lines
In these systems, the buffer tank increases water volume, providing both energy savings and stable operating conditions.
Conclusion
Boiler, accumulation, and buffer tank systems are complementary elements in the energy management of a facility.
Using the right product in the right system minimizes energy loss while extending the operating life.
Pressurized vessels produced with MIT's engineering power offer sustainable, efficient, and safe hot water solutions in both individual and industrial projects.
Whether used in solar-powered hybrid systems or central heating or cooling lines, every product produced with MIT quality means an investment that will work safely for many years.