Is zero cold water gas water heater necessary in 2023? Is it easy to use? Will it cost more gas? Let’s read more to know that.

Friends who have used water heaters should have a deep understanding of the fact that it is necessary to wait for a period of time before hot water can be discharged during bathing in winter, especially if the bathroom is far away!

The reason for this is that the water in the pipe has cooled due to a long time of not using the water heater. Therefore, when it turned on, it is necessary to wait for the cold water in the pipe to drain before starting to discharge hot water.

The farther away the bathroom is, the longer the hot water pipe will be. This is why the farther away the bathroom is, the longer the waiting time will be.

Is there any way to solve this problem?

Yes! Zero cold water is currently the best solution!

Then just buy zero cold water and it's over？

Not exactly! Although zero cold water is good, its disadvantages are also very obvious!

1、 Principle of zero cold water realization

"Zero Cold Water Implementation Principle Zero Cold Water actually has no lofty technology, and there is no black technology worth boasting about. The implementation principle is also very simple.". There are currently two main options.

Scheme 1: With return water pipe

The above figure is a schematic diagram with a return pipe. It can be seen from the figure that in addition to the cold water pipe and the hot water pipe, there is also a return pipe connected to the farthest hot water pipe. This allows the hot water pipe and the return pipe to form a circulating circuit. When the water inside the hot water pipe becomes cold, it will be heated through the return pipe to the water heater, and then discharged from the hot water pipe. This ensures that the water inside the hot water pipe is always hot.

Scheme 2: No return pipe

The above figure is a schematic diagram with a return water pipe. As can be seen from the figure, there are only two pipes: a cold water pipe and a hot water pipe. The difference is that a one-way valve is installed between the farthest hot water pipe and the cold water pipe, so that the hot water pipe and the cold water pipe can form a circulating circuit, thereby achieving zero cold water.

See the problem? The hot water pipe and the cold water pipe form a circuit for circulating heating. Isn't that even the water in the cold water pipe turned into hot water? Yes, that's why the water used to flush the toilet is hot water!

2、 Will zero cold water cost more gas?

The answer is yes: It's more exhausting!

However, compared to the cost of embedding the return pipe and the excess cost of purchasing a zero cold water gas water heater, it is a bit insignificant.

Currently, most zero water heaters have the following four settings:

1. All weather cycle mode

To put it bluntly, it means circulating heating all day and 24 hours a day. It's strange not to waste gas

2. Timed cycle mode

This mode is also easy to understand, that is, it can be set to cycle heating at a certain time period, such as the peak bathing water period at night

3. Jog cycle mode

Turning on/off the faucet will activate the warm-up start, but there will be more waiting time in the middle (the function of chicken ribs)

4. Single cycle mode

Start the circulating pump through the water heater control panel, remote control, or APP, and use it once. After a minute or two, you can take a hot bath

Summary:

Of the four modes, the most gas saving mode is the jog mode and the single mode, followed by the timed mode, and the most gas consuming mode is the all-day cycle mode.

Taken together, timed cycle mode and single cycle mode are more recommended, which can be selected according to your actual situation.

3、 What is the difference between zero cold water and water quantity servers?

Zero cold water and water quantity servers are two completely different things that solve completely different problems.

Zero cold water: As mentioned earlier, it mainly solves the problem that it takes a period of cold water to produce hot water when bathing in winter;

Water volume server: It is a temperature control method, which is currently the best method for constant temperature performance. It mainly solves the problem of intermittent cooling and heating of the water temperature during bathing due to unstable water pressure.

The return pipe and cold water inlet of the two pipes are both on the same pipe, and the circulating pump is installed on this pipe. The disadvantages of this installation are also obvious:

1. Shorter service life of circulating pump

Due to the fact that both the cold water inlet and return water pass through the circulating pump, this greatly increases the service time of the circulating pump, resulting in a shorter service life

2. Less water

Due to the fact that cold water inflow also passes through the circulating pump, the resistance generated by it will reduce the water pressure to a certain extent, resulting in a smaller water volume.

The advantage of three tubes of zero cold water is that it perfectly solves the above two problems!

However, three tubes of zero cold water also have disadvantages:

1. If there is no return water pipe in the home, it is generally not possible to use a three pipe type. Whether you have a return pipe in your home or not, the two pipe type is suitable.

2. The price of three tubes is usually more expensive than that of two tubes