At present, there are two types of water heaters suitable for home use on the market, one is gas type and the other is electric type. Gas water heaters are subdivided into liquefied petroleum gas, artificial gas and natural gas types due to different fuels used. Electric water heaters are also divided into water storage type and instant heating type.
In fact, in terms of the final use effect, if installed properly and the pipelines are smooth, both gas water heaters and electric water heaters can be satisfactory. It is difficult to say who is better and who is worse.
When purchasing a water heater, you must consider price and safety. Convenience, lifespan, cost, after-sales service and other factors. In recent years, some manufacturers have exaggerated when introducing their products. If consumers want to buy satisfactory products, they need to know more, compare more, and analyze more.
Generally speaking, the advantages of gas water heaters are low price, fast heating, large water output, and stable temperature. The disadvantages are that they must be installed in separate rooms, are difficult to adjust the temperature, require regular descaling, and are prone to harmful substances during use. gas. At present, products of less than 5 liters on the market have been basically eliminated, and products of more than 6 liters have gradually become the mainstream, and some products have even reached 9 liters and 10 liters. According to experts, due to the different pressures of tap water in residents' homes and the fact that pipelines are basically divided into four branches, it is most suitable to purchase products with a water output of 6 liters/minute. Because even if you buy a product with more than 8 liters/minute, due to the limitations of pipeline diameter and water pressure, the water output in most households can only reach the level of 6 liters/minute, not to mention that in most households, The actual water inlet and outlet pipes cannot guarantee that they all reach the level of 4-minute diameter of the inner wall of the pipe, so even the water output of 6 liters/minute cannot be achieved (this also applies to instant electric water heaters). Furthermore, when purchasing a gas water heater, you should choose flue-type or forced exhaust-type products according to your own use environment.
The advantages of storage-type electric water heaters are that they are clean and hygienic, do not need to be installed in separate rooms, do not produce harmful gases, and are easy to adjust the temperature. High-end products also have functions such as automatic power off and automatic temperature replenishment after reaching the set temperature. , the latest model also has a built-in anode magnesium rod descaling device. Most products are safer in use due to their triple protection devices of overvoltage, overheating and leakage. The disadvantages are that the price is high, the heating is diffuse, and it takes up space, so it is not suitable for families with large populations. Furthermore, since the liner is fully enclosed, qualified consumers are best to choose products with a vitrified enamel insulation liner to delay scaling as much as possible. The most technical part of the storage-type electric water heater is the inner tank. The quality of the inner tank is directly related to the service life of the water heater. Therefore, although the ordinary stainless steel welded inner tank product is better than the double-layer vitrified enamel inner tank formed by one-time sintering The price of the products is more than half lower, but the service life is only 1/5 to 1/3 of the latter. According to tests, under normal circumstances, the double-layer vitrified enamel liner can not only prevent corrosion and scale, but also have a service life of more than 20 years. In addition, the power of storage-type electric water heaters is generally between 1200W and 3000W. The more famous brands are mostly set below 1500W. There is no need to modify the original electricity meter and wires in the home. Based on the 45-minute bath time per person and the current charging standard (0.35 yuan/kWh), the electricity bill will not exceed 0.6 yuan. However, considering the need for preheating, in order to reduce the waiting time of other members of the family, generally do not buy according to the ratio of family population to capacity marked on the product description. It is best to choose a model with a slightly larger capacity. When bathing continuously, two mouths It is best to choose products of 80 liters for a small home, and products of more than 100 liters for families with more than 3 people.
The advantages of instant water heaters are convenience, time saving, no space occupation, safety, and minimization of heat loss. The disadvantages are that they are expensive and require high electric meters and wires. Generally, they need to have An electric meter of at least 30 amps and a copper wire with a cross-section of 4 square millimeters are required, so it is inconvenient for families living in old houses to use it. It is worth noting that a few consumers have purchased some such products with a power of less than 4000W without understanding the situation, but the water temperature may not be hot enough when used in winter. The following formula can immediately calculate whether your home is suitable for installing such products: (the total power of other commonly used electrical appliances in the water heater power ten) ÷ 220W = meter amperage. If the power of the tankless water heater is 7200W, then even if all the electrical appliances in the home are turned off, the electric meter requires 33 amps. Even if it is used for a short time, it is unbearable without a 17 amp electric meter.
After understanding the above content, consumers can choose the product that best suits their actual situation. However, judging from the current situation in Western developed countries, it is the general development trend for electric water heaters to replace gas water heaters, which cannot but attract people's attention.