How to choose a wall-hung boiler

1. Choose power

Is the greater the power of the wall-hung boiler, the better? Is the greater the power of the wall-hung boiler, the better the room? What about warmth?

Usually when we go to a physical store, the shopping guide or salesperson will tell us that it is better to buy a larger wall-mounted boiler. We are afraid that the room will not be warm, so we use the big one instead of the small one, so we spend more. Money, is this what it is?

Let’s explain the relationship between the heating effect of the room and the power of the wall-mounted boiler. Let me tell you in detail what size of wall-mounted furnace is suitable for your room. Let’s take a 120-square-meter room as an example to see whether 20kw or 24kw is more suitable. Is the 24kw one warmer than the 20kw one?

For a 120-square-meter room, we take the room temperature to be kept at 18°C, the outdoor temperature to be 5°C, and the water supply temperature to be 80°C. As an example, we can estimate that the average energy consumption per square meter should be between 140w and 150w. , then multiplied by the radiator correction coefficient 0.85, so the energy consumption of the entire room should be 120*150*0.85=15300w. In such a room with actual energy consumption, is it better to use 24kw or 20kw? Is 24kw better than Will a 20kw room be warmer or heat up faster? According to the combustion stability theory of wall-mounted boilers, if a 24kw stove is used in a room with an actual energy consumption of 15kw, the combustion will be more unstable, the room will heat up slower, and the heating effect will be worse. Therefore, we say that the greater the power of the wall-hung boiler, the warmer the room will be. If it exceeds the power, the heating effect will be worse and the temperature will rise slower.

From this we can conclude that the one that suits you has the best effect. It does not mean that the greater the power, the warmer the room will be.

2. Choose a brand

Common brands on the market include German, Italian, Korean and domestic brands. Which brand is more suitable for us to choose and from what angle should we choose? What about the wall-mounted stove? Now let’s talk about the selection criteria for wall-hung boilers. A wall-hung boiler should first be a heating furnace, so when we choose a wall-hung boiler, we should first choose a wall-hung boiler based on the heating effect. It should be said that only a wall-hung boiler with a good heating effect is the best wall-hung boiler. Then you have to take a bath. The temperature of the bath water should be stable, not hot or cold. In addition, the room should heat up faster. The second is energy saving, durability, long service life and long warranty. Mainly these points.

Let’s talk about heating temperature in detail. Different wall-mounted boilers have different heating effects. Some wall-mounted boilers can have a difference of 2 to 3 degrees when the heat dissipation equipment remains unchanged. Why does this happen because the combustion stability of the stoves is different. The stove is on fire for a while, and then goes out, which will cause the heating water temperature to fluctuate. The greater the fluctuation in the heating water temperature, the worse the temperature effect. Therefore, when we buy a wall-hung boiler, we must choose a stable wall-hung boiler and avoid frequent ignition, so that our heating effect will be better. At the same time, the bath water temperature will not be hot or cold. In addition, it also depends on how quickly the room heats up, which is also related to whether the combustion is stable.

Another issue is energy saving. There is an important certification standard for energy saving, which is the European three-star standard. Generally, wall-mounted boilers are China's second-level energy consumption. If they can reach first-level energy efficiency, their energy-saving value will be Quite obvious.

3. Select the model

Wall-hung boilers on the market can be divided into casing machines, plate changers, frequency converters, secondary condensing furnaces, and fully premixed condensing furnaces. Which one is more suitable for us? We also take a 120-square-meter room as an example. In terms of power, the 20kw furnace has met our requirements. So should we use a casing machine or a plate replacement machine?

First of all, we should understand the difference between the casing machine and the plate exchanger. The casing machine has one less plate heat exchanger than the plate exchanger. The plate heat exchanger increases the heat exchange area and improves the efficiency of exchange. Thermal efficiency; at the same time, when the stove is extinguishing a fire, there is still internal circulation heating water and sanitary hot water for heat exchange, so that the bath water temperature will not immediately become cold, and the water temperature fluctuation range will be reduced. But isn’t the plate changer necessarily better than the casing machine? We know that the plate exchanger solves the problem of stabilizing sanitary hot water when the wall-hung boiler burns in an unstable state. If the wall-hung boiler can burn stably, there is no need for a plate heat exchanger.

Therefore, when we choose a wall-hung boiler, we must first consider its combustion stability, and then consider selecting a plate replacement or casing machine. Generally 20kw, 24kw, to achieve stable combustion, you need to use a casing machine; if the area is relatively large, it is recommended to use a variable frequency wall-mounted boiler or a condensing wall-mounted boiler above 30kw. The variable frequency wall-mounted boiler has a considerable degree of energy saving under partial load operation. Obviously, it can reach national level energy consumption.

The main value of the two-stage condensing furnace is also energy saving. Its thermal efficiency is higher, which can reach 104. Its advantage over the fully premixed condensing furnace is that it does not require water quality and temperament, and the temperament has wider adaptability. .

The fully premixed condensing furnace has higher requirements for water quality and temperament and higher thermal efficiency. However, it is troublesome to use and maintain and is prone to failures caused by water quality and temperament. The stability of its products needs to be improved and tested.

In short, the choice of power, brand and model are inseparable from each other. I hope that every consumer will not blindly follow them and choose a wall-mounted boiler that suits them.