Double-Wall Water Tank

A double-wall hot water storage tank is a key component of a central boiler room, designed to supply domestic hot water. Below, you'll find 5 key selection considerations, guidance on capacity sizing, and the best prices for purchasing double-wall hot water storage tanks.

Expert Guide to Choosing and Pricing Double-Wall Hot Water Storage Tanks

A double-wall hot water storage tank consists of two concentric cylindrical chambers and is manufactured in capacities ranging from 300 to 1,500 liters. The outer chamber carries hot water from the boiler, while the inner chamber is designed to heat and store domestic hot water. In addition, the tank features two completely separate circulation paths for the domestic water and the boiler hot water supply and return lines.

Heat is transferred directly from the outer wall to the inner wall of the tank, a design that helps reduce maintenance costs. Thanks to its unique double-wall construction, the tank provides efficient heat transfer, allowing domestic hot water to be produced quickly while minimizing energy consumption.

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Accessories of the double-walled hot water tank

Safety valve:

When the temperature exceeds the set limit, the safety valve opens automatically through its sensor and prevents the explosion of the double-walled tank.

Gate valve:

A gate valve is needed to turn the water flow off and on. A gate valve is installed and used to open and close water when necessary.

The outlet route of the hot water:

The path of the hot water tank is installed in the upper part of the tank, and the function of this channel is to send hot water from the double-wall tank of hot water into the building.

Hot water inlet route:

The hot water inlet connection from the boiler room is installed on the outer wall of the double-walled tank at its lower section. The incoming hot water circulates around the tank, facilitating heat exchange with the main domestic water storage. After this process, the heated water is directed to the hot water return channel located at the upper section of the double-walled tank, leading it back into the boiler.

5 Key Considerations Before Purchasing a Double-Wall Hot Water Storage Tank

The following points should be considered before purchasing a double-wall hot water storage tank:

• A double-wall hot water storage tank requires more installation space than a plate heat exchanger.
• When the storage tank capacity exceeds 1,000 liters, its operating efficiency decreases. In such cases, a coil water heater storage tank is generally the better choice.
• As a general guideline, a double-wall hot water storage tank with a capacity of approximately 200 to 250 liters is recommended for each residential unit.
• The inner wall of a double-wall hot water storage tank cannot be repaired if it becomes perforated.
• When placing an order, carefully check the tank diameter and dimensions to ensure it can pass through the boiler room entrance and be installed at the intended location after delivery.

Latest and Most Competitive Double-Wall Hot Water Storage Tank Price List for 2026

The table below presents the latest and most competitive 2026 price list for double-wall hot water storage tanks from the trusted DamaTajhiz and Araz Sanat brands, including technical specifications, capacities, and prices, helping customers make the best purchasing decision based on their requirements.

Before purchasing a double-wall hot water storage tank, we recommend contacting DamaTajhiz's technical experts to receive the best pricing, review the complete technical specifications, and benefit from free professional consultation in addition to reading the buying guide.

The table below shows the price list for double-wall hot water storage tanks manufactured with 3×5 mm, 2×4 mm, 2.5×5 mm, and 3×6 mm steel plates and capacities ranging from 300 to 1,500 liters.

Brand	Steel Plate Thickness (mm)	Material	Tank Capacity (Liters)	Price (USD)
DamaTajhiz	3×5 3×6	Galvanized Steel	300–1,500 Liters	From 381 to 1307
Araz Sanat	2×4 2.5×5 3×6	Galvanized Steel	300–1,500 Liters	Contact Us

 

Important Note: When ordering a double-wall hot water storage tank, in addition to selecting the required capacity and the type and thickness of the tank shell, the tank dimensions should also be carefully considered to ensure it can pass through the boiler room entrance, be installed easily, and operate properly (including the base and the required overhead clearance). Please note that once the order has been confirmed and manufacturing has begun, the tank cannot be returned.

Advantages of a double-wall hot water tank

• The ability to keep hot water without the need for a circulator pump
• Very low pressure drop
• Low cost of repair and service
• Reasonable purchase price compared to other hot water heating systems

The water volume of the hot water tank is double-wall

The amount of water volume or the capacity of the double-wall tank is calculated and estimated according to factors such as the number of units, the type of building used, the demand factor, the simultaneity factor, the consumption factor, and the number of consumers of hot water and using the table included in the DamaTajhiz HVAC Co. website; Therefore, it can be said that the number of units and the type of user is the most important selection component to determine the volume of the double-wall tank. Usually, in order to supply hot water for uses less than 600 liters, it is more common to use a double-walled tank.

The Table for Estimating and Determining the Capacity of a Double-wall Tank

The thickness of the hot water double-wall tank sheet

The double-walled tank comes in different thicknesses, with the outer wall typically ranging from 2 to 3 millimeters, while the inner wall, which must withstand the pressure of incoming cold water from the municipal network, varies between 4 to 5 millimeters depending on the tank's capacity and the model of each manufacturer.

Material of double-walled hot water tank sheet

The sheets used in the construction and production of the double-wall tank are of the galvanized type. This galvanized sheet is the same as black iron, but the shiny metal coating on this sheet causes galvanization. Galvanized makes it resistant to corrosion and decay. The galvanized sheet used in the double-wall tank is made by hot-dip galvanizing.

To prevent damage and loss of the layer on the galvanized sheet in the welding parts, edible epoxy paint is used for the inner layer and industrial epoxy for the outer part, which protects against rust.

Points to consider before buying a double-wall tank:

• It needs more space than the plate heat exchanger
• In some cases, when the dimensions of the tank are large, its work efficiency decreases.
• The tank may be vulnerable or punctured.
• It is difficult to repair a damaged or perforated wall
• When placing a purchase order, you must pay close attention to the diameter and dimensions of the tank so that after delivering the tank, it is possible to pass through the door of the engine room and install it in the desired location.

Buy a double-wall hot water tank

There are different types of double-walled springs that are used to supply health spas, which are designed and produced in different sizes and dimensions. In order to choose and buy a double-walled hot water tank, you must first determine the capacity and dimensions of the required tank. On the website of DamaTajhiz specialized HVAC collection, the technical information of dozens of models of double-wall tanks from reliable brands with original warranties has been presented, so that you, dear ones, can enjoy the good feeling of optimal and smart shopping.

The price of a double-wall hot water tank

The double-wall tank, like other heating equipment, has different capacities, technical specifications, and prices, It should be mentioned that the price of the double-wall hot water tank provided on the website of DamaTajhiz HVAC collection is up-to-date and this price also includes the guarantee that the best price and quality of the site. The thermometer is valid.

Tips that you need to know for better maintenance of a double-walled hot water tank:

- To prevent the loss of thermal energy and reduce fuel consumption, it is very important to insulate the double wall tank.

- It is necessary to install a one-way valve to prevent the return of hot water into the pipes.

- To prevent decay caused by water hardness, we can increase the lifespan of the double-wall tank by using a water hardness device.

- For descaling and increasing efficiency, an acid wash water tankshould be used.

- Keep in mind that it is absolutely necessary to install a temperature and pressure safety valve on any tank to prevent sudden events.

Dear user:

• While thanking you for the confidence you have in the technical opinions of DamaTajhiz HVAC sales experts, it should be mentioned that the principles of determining and choosing the desired product brand based on history, brand strength, service, and product price are ultimately determined by the buyer. But in double-walled tanks, most of the users and buyers choose and buy best-selling brands such as DamaTajhiz & Co. due to their quality, price, and after-sales service.
• If, after reading the above material, you have more questions about deciding on the purchase of double-wall tanks, you can contact the DamaTajhiz HVAC corporation and extension numbers 107-108-121-122, from the sales experts of the heating equipment and engine room department. Get advice and ask your questions.

"Buy with confidence and peace of mind"

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The presence of DamaTajhiz & Co. in the international exhibitions of construction facilities and cooling and heating systems from 2014 to 2016.

In addition to a valid business license from the heating and air conditioning trade union, the DamaTajhiz HVAC specialized collection has an electronic trust symbol and started its store site in 2013 in the head office of Tehran.

 

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