What you need to know about cast iron boiler

Hot water boilers or cast iron heating boilers are one of the most important components of the engine room and the central heating system of the building because these boilers are the main part of the engine room facilities that provide heating to different parts of the building. The body material consists of different types and they are classified into two types cast iron boilers (cast iron boilers) and steel boilers.

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What is a cast iron boiler?

The cast iron heating boiler is one of the most common types of hot water boilers, the heat caused by the burning of the fuel in the burner raises the temperature of the fluid inside it. Cast iron boilers are made and assembled as fins, and the heat capacity of the boiler can be increased by increasing the number of fins. The cast iron material of the boiler is refractory cast iron and is resistant to oxidation and moisture.
Since cast iron and steel boilers have their uses and advantages, one of the concerns of people when buying cast iron and steel boilers is high heating efficiency and high working pressure tolerance.
In the production of cast iron boilers, gray cast iron is used and they are produced in different capacities and the form of fins and by casting method. The number of fins of cast iron boilers is determined according to their required heat capacity, and the higher the capacity, the more fins are used in these boilers.
Cast iron boilers consist of several middle blades, one front blade, and one rear blade depending on the capacity, and these blades are connected using a bush. There is a difference between the end vanes and the middle vanes, while all the middle vanes are the same.

What is a steel boiler?

The steel boiler is made of steel sheets according to the heat capacity required by the consumer and is classified based on the capacity and working pressure, regardless of their dimensions. These boilers are available in two types:
Water in the tube (water tube): In this model, instead of fire, the water inside the tubes circulates.
Fire in the tube (fire tube): In this model, the heat and gases caused by the combustion of the flammable substance pass through the tubes.

Advantages and disadvantages of cast iron boilers

Cast iron boilers have many uses in home installations and have the following advantages:

• Resistant to rust and corrosion
• Easy transportation of boiler vanes due to easy transportation, heat capacity can be changed by increasing or decreasing the number of vanes.
• Replacement of defective and broken blades if they are broken or punctured due to heat
• The cheapness of the blades
• Cast iron boilers are available in small sizes and occupy little space in the engine room.
• Variation of heat capacity with changing blades

Disadvantages of cast iron boilers

One of the problems that occur in cast iron boilers is the cracking of the engine room cast iron boiler blades, which is caused by the high pressure of the system, thermal stresses, and the formation of deposits on the inner surface of the blades.
It is not recommended to use cast iron boilers in places with a large temperature difference, as well as areas with cold winters because they are limited in terms of working temperature and pressure. These boilers crack due to thermal stresses caused by relatively cold return water on the fins, but many of these problems have been solved in new generation boilers by using Aquastream technology.
The weak points of cast iron boilers include their low resistance to direct contact with the flame. Also, if there is no water inside the boiler and the burner remains on for more than 5 minutes, the blade will be damaged and the blade must be replaced. be replaced

The difference between cast iron and steel boilers

Based on the type of use of the boiler, you can decide which one is more suitable.
Standard steel boilers have a longer lifespan than cast iron boilers.
Cast iron boilers are suitable for small buildings with heating systems with low capacity and working pressure. Steel boilers are the best choice for multi-story buildings with high capacity and working pressure heating systems.
Most models of steel boilers have higher efficiency than cast iron boilers, but Super three-pass models have very high efficiency. Also, steel boilers have a much longer lifespan than cast iron boilers. Cast iron boilers have a higher sedimentation rate than steel boilers, for this reason, after a while, their efficiency quickly decreases compared to the initial state, and their fragility increases.

Use of cast iron boilers

Since cast iron boilers are used for low pressures and up to 5 bar, they are mostly used in greenhouses, towers, swimming pools, and places that need hot water. Cast iron boilers are not very suitable for cold regions because the water temperature difference may cause the fins to crack.

Important points in the assembly of the cast iron boiler

One of the most important issues in the operation of boilers and burners is their chimney, and chimneys must be 100% insulated, and if the chimney is too high, to prevent it from cooling down and mixing water vapor with sulfur, which causes decay, to maintain the temperature balance A heater should be placed on the way.
The chimney temperature should not be more than 200 degrees because it will waste energy and pollute the environment. A temperature lower than 180 will also cause condensation and create moisture inside the chimney body, which will cause decay in the chimney.

Reputable brands of cast iron heating boilers

1. Shofajkar company (with a 10-year warranty and after-sales service)
2. Pipe and Machine Manufacturing Company (MI3 cast iron boilers with a 10-year warranty and after-sales service)
3. Info Company (with a 14-year warranty and after-sales service)

Cast iron heating boiler

Shofajkar cast iron boiler with more than 40 years of experience is one of the most knowledgeable spas cast iron boiler brands in Iran and it is produced and marketed in different capacities and models, the diversity of its models will cover all heating needs up to 1,300,000 kilocalories capacity.

In addition to quality and reasonable price, Shoufagekar cast iron pot has very good after-sales service and a 10-year warranty.

The most famous and widely used Shankar cast iron boilers are as follows:

• Shofajkar Super 400 cast iron pot
• Cast iron boiler Shofajkar 400 (Solar 400)
• Shofajkar Super 300 cast iron pot
• Shofajkar Solar 300 cast iron boiler
• Shofazkar Star 1300 cast iron pot
• Turbo cast iron boiler
• Superheat 1300 cast iron boiler
• Shofajkar Star 1300 cast iron pot
• Shofajkar Super 200 cast iron pot
• Shofajkar Super Plus 200 cast iron pot
• Boiler 500 cast iron boiler

Installation and assembly of cast iron boiler

Cast iron boilers are in the form of separate fins that are made in a foundry factory, and since cast iron boilers can be assembled in different capacities, they are used in residential and commercial complexes, offices, and villas.

• Before assembling the boiler, be sure to clean the blades completely.
• The boiler should be selected according to the substructure and total building area, the number of units, and the type of use.
• The burner should be selected according to the capacity of the cast iron pot.
• Use a hardener.
• In order to use the maximum efficiency of the cast iron boiler and the uniformity of heat distribution, the outgoing pipe (water exit) should be installed at the top of the boiler and the return pipe (water entering the boiler) should be installed in the lower part in front of the boiler. Solar 300, Solar 400, and Super 400 boilers do not have this possibility. Turbo boilers from 8 to 15 blades and 1300 boilers from 7 to 20 blades have this capability.
• To prevent thermal stresses caused by longitudinal expansion, it is recommended to build a concrete platform at least 10 cm high from the floor of the engine room based on the weight of the boiler.
• The maximum capacity of the burner should be suitable for the capacity of the boiler or 20% higher. The flame length of the burner should cover 4/3 of the length of the pot and always 1/4 of the end of the pot should be free of flame and the burner should be installed exactly horizontally in the center of the furnace so that if the flame of the burner hits the sides or the top, it will cause the formation of deposits and then Since some time, due to the lack of water circulation, the blade cracks.
• During assembly and transportation, avoid tapping the blades because it will cause small cracks in the walls and cause water leakage over time.
• At the time of assembly, all blades should be completely sealed with fireproof mud.

The price of a cast iron boiler

All kinds of boilers and hot water boilers installed in the heating rooms of the building are responsible for providing hot water for heating equipment such as floor and ceiling fans, and radiators, as well as providing hot water for washing and consumption, and hot water for swimming pools. Cast iron heating boilers are less expensive than steel boilers due to easy transportation, separable fins of the boiler, cheapness, applicability of defective fins, and power and thermal energy absorption efficiency.

You can also read the article TYPES OF ENGINE ROOM BOILERS AND THEIR COMPARISON for more information.

Final speech

The specialized collection (Damatajhiz) (the first and most reliable authority in the country in the field of building facilities equipment and all air conditioning devices), offers you all kinds of sand filters and hundreds of other products, guaranteeing the originality of the product, valid warranty, and reasonable price. In addition, if you have any questions about choosing and comparing the brands of this product, you can get free advice from the heating equipment experts.

In Iran, the first and most famous specialized group in the field of building installation equipment, air conditioners, and all equipment for swimming pools, saunas, and jacuzzis since 2004, DamaTajhiz is a specialized group. Refer to the time of this group. For more information, you can get advice from the experts of DamaTajhiz Engineering and Production Company by calling 021-88822550.

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