Central Heating Boiler

A central heating boiler (wall-mounted / floor-standing) is widely used in providing independent heating for residential and office units. The following provides the specifications, brands, models, analysis, capacity estimation tips, and the best purchase price of all central heating boilers for wholesale purchase with warranty.

Central Heating Boiler Selection Guide

The central heating boiler is the kind of device that can simultaneously supply hot water for consumption and heating water for each of the apartment units instead of the central engine room. The floor or wall-mounted central heating boilers can be easily installed in a cabinet place. In addition to higher efficiency, central heating boilers have lower fuel consumption than those big boilers in the engine room.

Also, the use of a central heating boiler, in addition to eliminating extensive piping in the building, makes each unit independent in terms of providing heating and hot water consumption. In general, central heating boilers are divided into two types: wall-mounted and floor-standing in terms of placement and installation.

At the beginning of this article, we suggest calculating the approximate capacity of the central heating boiler (both wall or floor standing) required for apartment units, multiplying the square footage of the unit by the number 150, and for office units, multiplying the square footage of the unit by the number 100, and for houses and buildings outside the city, multiply the square footage by 200 to get the capacity of the boiler (either gas or diesel). For more information, you can contact the experts of DamaTajhiz HVAC.

The supply of all types of authentic brands of central heating boilers with a guarantee of product authenticity and a delivery time of 2 to 4 hours (in Tehran), along with free installation and the most appropriate prices, has been done by the DamaTajhiz HVAC Group since 2013 as a valid and official member of the Union of Heating Equipment and Ventilation Equipment Sellers.

Capacity calculation of the central heating boiler

The capacity of the central heating boiler means the effective heating power of the device, which is calculated in units of kilowatts (kW) or kilowatts per hour. This capacity indicates the heat a central heating boiler can produce in one hour.
The capacity values of the central heating boilers can be different and depend on the heating needs of the desired place.
The measurement of the capacity of the wall-mounted central heating boiler in the form of kilowatts is usually done in ranges such as 24kW, 28kW, 30kW, and 35kW, and based on kilocalories, it is usually 28, 25, 20, 35 kilocalories per hour, and based on the heating requirement of the relevant unit, you can choose a wall mounted central heating or a suitable floor standing one.
There are two common methods to calculate the capacity of the central heating boiler: the approximate method and the exact method.

The approximate method of calculating the capacity of the central heating boiler

To calculate the approximate capacity of the central heating boiler (wall or floor-standing) needed for apartment units, multiply the square footage of the unit by 150; for office units, multiply the square footage of the unit by 100; and for villas and buildings outside the city, multiply the square footage of the villa by 200 to get the capacity of the wall or floor-standing central heating boiler (gas or diesel) required for the relevant space.

The exact method of calculating the capacity of the central heating boiler

In this method, various parameters are considered, such as:

• weather conditions
• geographic location
• place area
• number of residents
• building materials
• number and dimensions of windows and doors
• heat transfer coefficients
• the amount of cold air entering the building and the air change rate

These are carefully calculated to determine the exact heating load of the particular unit. Facility engineers and professional consultants usually do the exact calculation of the capacity of the central heating boiler.

The formula for calculating the capacity of the central heating boiler

QT=[(U1*A1+U2*A2+U3*A3+…)∗ΔT+(V*0.0749*0.24* ΔT)]*4

here:

• QT: Heating load of each unit in kilocalories per hour
• U1 to Un: Heat transfer coefficient of each surface between the inside and outside of the building in terms of BTU/ft2.hr. °F, which should be determined based on the material of each wall, using engineering reference tables.
• A: The area of each peripheral surface of the corresponding unit that transfers heat to the outside of the building. This area (in square feet) includes walls, windows, doors, and ceilings.
• ΔT: The temperature difference between the inside and outside of each unit under normal conditions, which is in °F.
• V: Total amount of air infiltrating through door or window seams (CFH) in ft3/hr
• Constant factor 0.0749: Air density in conventional conditions in the English system of units
• Constant coefficient of 0.24: Specific heat capacity of ambient air in conventional conditions in English units

In the above formula, by calculating the values of all the parameters, you can get accurate results to determine the capacity of the central heating boiler required for each building unit. Note that the exact values of U and area A for each surrounding surface must be considered based on specific details in each building and heat transfer coefficient tables.

Note: The heat required to provide hot water in floor-standing and wall-mounted central heating boilers is not calculated separately for heating systems and consuming water. When the hot water tap is opened, the central heating boilers cut off the heating system of the unit and allocate their heating power to the hot water through the flow switch and the automatic brass tap using their second heat exchanger until the hot water tap remains open, and then again provide heating for the relevant unit heating system.

Different Types of Central Heating Boilers

The wall-mounted and floor-standing central heating boilers have different types that are designed based on the different sizes and capacities. In order to choose the right central heating boiler, you must first determine the desired capacity and dimensions. On the website of DamaTajhiz HVAC, the technical information of dozens of models of wall and floor-standing central heating boilers from reputed brands and with their main guarantee has been provided for you to enjoy the good feeling of optimal and smart shopping.

Types of central heating boilers in terms of fuel consumption

Central heating boilers are divided into four types according to the fuel type:

• Gas burner central heating boiler (noiseless wall and floor-standing)
• Diesel burner central heating boiler (floor-standing with the ability to be installed in the engine room or a warehouse outside the unit)
• Dual-burner central heating boiler (floor-standing with the ability to be installed in the engine room or a warehouse outside the unit)
• Electric central heating boiler (noiseless wall and floor-standing)

Note: Diesel and dual-burner central heating boilers are mostly installed in the engine rooms of houses and private buildings that have front and/or backyards.

Types of central heating boilers in terms of the number of heat exchangers

Central heating boilers, in terms of the number of heat exchangers, are divided into two categories:

Single heat exchanger central heating boiler: The structure of the heat exchanger in these boilers is such that the heating system water pipe and the consumption water pipe are separated. Still, they are exposed to the flame of the burner at the same time, and the water inside them is heated simultaneously. This results in quick hot water production and less depreciation of the central heating boiler due to the inactivity of the pump in the summer season. It goes without saying that the amount of sedimentation in single-exchanger boilers is more than in double-exchanger ones, and the output water may have temperature fluctuations.

Double heat exchanger central heating boiler: In double-exchanger central heating boilers, one heat exchanger is installed to provide hot water for the heating system, and one heat exchanger (of plate type) is installed to provide healthy consumable hot water. The water pipe of the heating system is directly exposed to the burner flame, but the plate heat exchanger provides the consumable hot water through heat exchange with the hot water of the heating system. Due to the existence of a plate heat exchanger in the double exchanger central heating boiler, hot water comes out with a uniform temperature, and the amount of sediment in these boilers is much less than the single exchanger ones.
These categories are determined based on the number of heat exchangers in each central heating boiler, and each type of heating boiler may have differences based on other features and characteristics.

Important Parameters for Choosing Gas-Burning Central Heating Boilers

It is important to keep these points in mind so you will not experience a malfunction or low function in your device:

• The surface of the building or the size of the residential unit
• The amount of hot water required is based on the number of bathrooms in each unit
• How to implement the chimney of the building (vertical to the roof or with a horizontal path)
• Supply of fresh air or oxygen required for the combustion of fuel used in the central heating boiler (for units smaller than 65 square meters)
• The minimum area that can be approved for installing a central heating boiler in an apartment unit is 64 square meters. Otherwise, it is mandatory to install the central heating boiler outside.

Central Heating Boiler Technical Tips & Points

The following tips will grant you the acknowledgment of these devices, which in some cases is very necessary:

Central Heating Boilers with Built-In Fans

In the conditions where the installation of the central heating boiler is in an open space such as a balcony or patio, or a part of the chimney path runs horizontally (more than 30 cm), the fan central heating boiler is used, the ventilation fan in the section The exhaust central heating boiler transports combustion gases outside the building.
For this reason, the fan central heating boiler is usually equipped with a special double-walled chimney, whose inner wall has a diameter of 6 cm. With this method, the combustion gases of the central heating boiler are discharged to the outside environment through this chimney, whose outer diameter is 10 cm.

Note: If your central heating boiler is going to be placed in an open environment such as a balcony, patio, or backyard, you should definitely use a boiler with a built-in fan, as well as an anti-freeze system. The anti-freezing system works only if the central heating boiler is connected to the electricity and if the device has started its operation at a low temperature.

Double Heat-Exchanger Central Heating Unit

The central heating boiler with two heat exchangers (one for the heating system of radiators and one exchanger for supplying hot water consumption); due to having two heat exchangers, the flow of hot water is continuous, which reduces deposits in the exchanger.

A double heat exchanger central heating boiler is used where either the incoming water is hard (salts) or the apartment floor is more than 120 meters.

Frost Resistant Central Heating Boilers

Some models of central heating boilers are equipped with a protection system against freezing, which must be turned on for its activation. In addition, the following terms are required:

• Connecting to electricity
• A minimum pressure of one atmosphere to the water inside
• Gas connection (the advantage of these central heating boilers is that they can be installed both indoors and outdoors)

One Central Heating Boiler for Two Units

A central heating boiler for two office units that do not consume much hot water can be used if the heating power of the central heating boiler is proportional to the size of the mentioned units and some technical measures are followed. But regarding residential units, due to the limitation of hot water supply in central heating boilers and the possibility of using hot water in two residential units at the same time, installing a central heating boiler for two residential units (even if they have a small area) is absolutely not appropriate.

The matching devices with Central Heating Boilers

Today, in many buildings, the heating supply system of the units consists of "a central heating boiler with a radiator", "a central heating boiler with a ducted split AC", or "a central heating boiler with a ceiling-mounted fan coil", which in order to provide hot air in the cold season of the year, the hot water central heating boiler must have the power to flow through the fan coil or the split AC.

In this case, considering the limited pressure of the circulator pump of the central heating boilers (6ft), it is necessary to calculate the diameter of the pipes, the distance of the boiler from the AC or the fan coil, as well as the piping installation in the ducts, must be done exactly according to the piping table of closed systems and under supervision of the experts.

Note: To calculate the approximate capacity of the required central heating boiler, we multiply the square footage of the residential unit by 150 (kilocalories) and the square footage of office units by 100 (kilocalories) (because office units do not consume much hot water) and you can contact the experts of Damatajhiz HVAC Group for more info.

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The Difference between Wall-Mounted and floor-standing Central Heating Boilers

These 3 differences are considered the most important ones and probably all that you need to know:

Location & Installation: The main differences between wall-mounted and floor-standing central heating boilers should be the different types of space and installation methods they require.

Heat Production: Floor-standing ones are usually more powerful. Therefore, it is obvious that for places that require more heat production, a floor-standing central heating boiler is a far better option, especially for apartments and large houses.

Water Storage: Ground central heating boilers have a coiled tank or water storage tank, and this difference is very important when there is a water cut or water pressure fluctuations.

Central Heating Boiler Performance in Different Seasons of the Year

As you know, in the cold seasons of the year, in addition to providing hot water, the central heating boiler must also provide water for radiators and heating circuits. In the summer season, however, the only task of the central heating boiler is to supply hot water for consumption. In other words, whenever there is a need for hot water in summer, the central heating boiler burner is turned on automatically when the faucet valve is triggered. As the water consumption is stopped and the device is turned off, the electronic board is all on that task.

Installation Location Tips for Gas Burning Central Heating Boiler

These 7 tips will help you install your boiler in the most efficient way possible:

1. The installation site of the central heating boiler should not be above the gas stove and other heat-generating devices.
2. The minimum distance from the floor to the bottom of the central heating boiler is 120 cm.
3. The distance between the device and the opposite wall should be at least 1 meter.
4. The minimum distance from the adjacent wall or cabinet should be 15 cm on each side.
5. The vertical distance from the adjustment cap of the central heating boiler chimney to the chimney valve should be at least 50 cm.
6. The chimney of the central heating boiler should never be installed directly to the chimney vent inside the wall, but it should be placed at least 30 cm below the chimney vent. It is better to install the device as low as possible to the chimney valve. Increasing the distance between the central heating boiler and the chimney valve increases the suction and improves the exit of combustion gases; however, if your device has a built-in fan, you can easily install it in a place where a part of the chimney runs horizontally.
7. If you want to install the central heating boiler inside the cabinet, note that the central heating boiler device needs enough oxygen for combustion, so the bottom of the cabinet must be open. The cabinet door must be shuttered so that the device can receive the oxygen it needs from the environment.

Buying Wall-Mounted and/or Floor-Standing Central Heating Boilers

Today, central heating boilers are very popular among people from all around the world due to the independence of water consumption these devices offer.

In order to choose and buy the most suitable central heating boiler from various models in bulk, you must first determine the capacity and type of the central heating boiler. On the website of DamaTajhiz HVAC, technical information on dozens of central heating boilers from reputed brands, along with the main guarantee, has been provided for you to enjoy the good feeling of optimal and smart shopping.

The Price of Wall-Mounted / Floor-Standing Central Heating Boilers

The prices of central heating boilers vary based on the capacity, model, and brand available in the market; it should be noted that the prices presented on the DamaTajhiz HVAC website are all up-to-date, with a generous discount being applied to them. Therefore, the best price for all wall-mounted and floor-standing central heating units is guaranteed.

Also note that in the specialized HVAC group of Damatajhiz, all the central heating boilers are only sold in bulk. Therefore, if you want to wholesale any of theese products, contact us.

The price list of the best-selling wall and floor-standing central heating boilers

Please note that some models have asking prices, and prices may change. For more detailed information and more updated prices, you can contact the sales experts of Damatajhiz HVAC Group.

Dear Users:

As you may be aware, throughout the colder months of the year, the central heating boiler should also supply radiator water and heating circuits in addition to hot water. The central heating boiler should only supply hot water during the summer. In other words, whenever hot water is required, the central heating boiler's burner is automatically activated by opening the hot water valve. When the water consumption is reduced, and the hot water tap is turned off, the burner is turned off, which is controlled by the Electronics board.

If you need more questions to decide on the purchase of wall-mounted and floor-standing central heating boilers after you read the above, you can contact the Sale of DamaTajhiz HVAC Group and ask your questions.

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