Usually when decorating a new house, if you are sure to install a zero-cold water water heater, you can pre-embed the return water pipe in advance, so that you can directly install the zero-cold water gas water heater in a fixed position.
Some friends in old houses also want to change zero cold water, but not only is it troublesome to lay the return water pipe, and the cost is relatively high, so you can use the second solution, which is no return water pipe.
This solution uses a cold water pipe as the return pipe and installs a check valve at the farthest water use end, so that a circuit is formed between the hot water and the cold water. By heating the gas water heater, the hot water in the hot water pipe can be kept constant.
However, there is a bug in this solution without a return pipe, which may cause the hot water to be released when you want to use cold water. For example, when flushing the toilet, hot water comes out.
Some cold water pipes are not suitable for hot water, which may precipitate some toxic substances or reduce the service life of the water pipes. If a water purifier is installed at home, it may also be affected by hot water, causing the water purifier to fail; at the same time, the water temperature in the water pipes remains at a high temperature all year round, which is easy to breed bacteria in the water pipes, affecting the safety and hygiene of our daily water use.
In fact, zero-cold water heater with return water pipes also has a serious problem, which is that zero-cold water is maintained all year round, and the return water system needs to continuously flow the cooled water back to the water heater, and the water heater heats the water to the hot water pipe, which will cause a large amount of electricity and gas fees during this period. When you start to reheat when using hot water, it is no different from ordinary gas water heaters. Therefore, there are currently three main ways for zero-cold water gas water heaters: full-day mode, jog mode, and reservation mode.
all-day mode means keeping a certain temperature of hot water in the hot water pipe throughout the day, and you can set it yourself according to the usage conditions. However, this method is a waste of gas and electricity bills;
jog mode means that the water heater does not start, and the faucet is turned on for 2-5 seconds before use, and then close it again. After the gas water heater receives the signal, it starts the zero-cold water mode. Generally, you need to wait for 3-5 minutes before turning on the faucet and you can use hot water directly. This method is not suitable for impatient or busy friends. It often happens when you wait for hot water to work on other things. When you think about it, the hot water is already cold. Moreover, it is extremely inconvenient compared to using an ordinary water heater to release water in advance.
reservation mode is more convenient for those friends who have a fixed schedule. For example, when you wake up at 6 o'clock, you need to wash your clothes and get home at 8 o'clock in the evening, you need to take a shower. Then you can set the zero-cold water period and use hot water at any time, which is the most cost-effective.
In addition, many water heaters now have remote control functions. Turn on the zero-cold water mode in advance before getting off work, so it is more convenient to use it directly when you get home.
In real life, there are always unsatisfactory aspects to using zero-cold water solution. There are many random events in life, such as if your hands are dirty and you need to wash your hands, the time is not fixed, and the time you use hot water is not long, usually only a few dozen seconds, or even a few seconds. For long-term use of hot water, such as bathing, washing faces, washing dishes, etc., an ordinary water heater can just put water in advance for a while. The wasted water, electricity and gas fees may be more cost-effective than zero cold water.
Under what circumstances is it more suitable for zero-cold water gas water heater?
1. The local tyrant or family has a large population and uses hot water more frequently. Turn on the zero-cold water mode throughout the day and use hot water at any time;
2. The room is larger, or the water pipes are longer, and you need to wait for a long time to use hot water every time;
3. Life is relatively regular, and there are fixed periods of hot water use, etc.
What should I pay attention to when choosing a gas water heater?
1. From the perspective of safety and cost-effectiveness, the strong discharge gas water heater has a higher cost-effectiveness. If the budget is relatively high, you can also choose a condensation gas water heater, which is mostly first-level energy efficiency and has better energy saving effect.
2. If the budget is relatively high, or the floor is high and the water pressure is unstable, you can choose a gas water heater with a water volume server for a better user experience; secondly, you can also choose a water and gas double adjustment. It is not recommended to choose a gas proportional valve only. Gas water heaters such as are greatly affected by water pressure and water flow.
3. If a new house is decorated, you can pre-lay the return water pipe. If you want to install a zero-cold water gas water heater, you can install it directly; it is not recommended to install a zero-cold water gas water heater without a return water pipe.
4. Before choosing a gas water heater, you need to know the type of gas at home and the maximum gas volume of the gas meter, rather than selecting the size of the gas water heater according to the so-called water use point, water use, etc.
5. The material of the gas water heater heater is preferred to use oxygen-free copper . Secondly, you can also choose stainless steel. When choosing, you need to pay attention to the thickness of the material of heat exchanger . Some cheap products will make the heat exchanger thinner to achieve the purpose of reducing costs.
6. Try to choose a gas water heater with a lower fan, which has a longer service life.
7. The zero-cold water gas water heater will generate a certain amount of noise due to the addition of a circulation pump. Try to choose a product with low noise when choosing.
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