I have been using an electric water heater at home, but recently it suddenly stopped heating, so I was thinking of replacing it with a gas water heater. There is a water heater store downstairs in my house, which sells various types of water heaters. The boss was very talkative, and I took the opportunity to ask a lot of questions about the gas water heater . Let’s sort out these questions and share them with you.
[Question 1] Will there be gas poisoning?
There were reports of gas water heater poisoning from time to time, but in recent years it has been rare. Mainly because the standards for gas water heaters have been upgraded - the gas water heaters of
back then were called "direct discharge". The flue of the water heater is like a chimney, which discharges the waste gas after burning natural gas out of the window. However, the smoke exhaust effect of the chimney is relatively poor, and some exhaust gas will remain in the room. In these exhaust gases, there is part of carbon monoxide .
Today's gas water heaters are all "forced exhaust type", with a exhaust fan installed inside the water heater (let's understand it this way). The exhaust gas can be actively discharged out of the window without leaving any residue in the room.
[Question 2] What does the size of a gas water heater mean?
Gas water heaters come in various sizes such as 10L, 12L, and 14L. The "size" here does not refer to the capacity of the water heater, but to its speed.
In layman's terms, it means: how many liters of water can be heated to 25°C per minute.
Therefore, the initial water temperature still has a great impact on the capacity of the gas water heater. Many people say, "My home uses it well in the summer, but in the winter the water temperature is not hot enough even when the water temperature is adjusted to the highest level." This is because the water heater is selected to be small.
[Question 3] When choosing a gas water heater
, you must first look at the number of water points that may be used at home at the same time - that is, the maximum possible water flow rate. The water output speed of a shower head is about 8L/minute; the water output speed of a faucet is about 6L/minute.
Add them together and you get the maximum water flow in your home.
Secondly, it depends on the lowest temperature in winter. If the outdoor temperature is very low in winter and the initial water temperature is very low, it is necessary to increase the liters of the water heater appropriately.
Generally speaking: in the south, it is generally recommended that a family of three choose a 12L water heater; in the north, it is recommended that a family of three choose a 16L water heater. Based on changes in population and housing types, appropriate adjustments can be made on this basis.
【Question 4】Is the condensing gas water heater good?
It’s good in terms of energy saving: the exhaust gas emitted by ordinary forced-discharge gas water heaters will still have a very high temperature. Condensing gas water heaters use the high temperature in the exhaust gas to preheat water.
This is equivalent to increasing the initial temperature of the water, so less gas can be used when heating. There is no heating in some places in the north, and the initial water temperature is less than 10°C. Even if you choose a larger water heater in these places, it will not work properly and you have to choose a condensing gas water heater.
Ordinary users do not need to choose the condensing type. Not only is the price high, but there is also a condensation pipe under the water heater, and you have to find a place for it to discharge the condensed water . Trouble, it doesn’t look good.
[Question 5] Can a gas water heater be installed in the bathroom?
In addition to the forced exhaust type and condensing type mentioned above, there is also a type of gas water heater currently on the market called "balanced type". balanced gas water heater can be installed in the bathroom.
Forced exhaust and condensing gas water heaters both need to use oxygen in the room when burning. The bathroom itself is airtight, and there is a lot of water vapor when you take a shower. It is easy to be dangerous when there is a lack of oxygen.
Balanced gas water heater uses outdoor oxygen for combustion. There are two channels inside its exhaust pipe, one for air intake and one for exhaust.
[Question 6] Can gas water heaters be installed in other rooms?
The common installation location of gas water heaters is the kitchen or the balcony adjacent to the kitchen. In some cases, it can be installed in the bathroom. Gas water heaters are not allowed to be installed in other rooms.
Gas water heaters are gas appliances. The national standard clearly stipulates that gas appliances must not be installed in residential rooms. For families, except for the kitchen, bathroom, and balcony, they are all living rooms.
In addition, the open kitchen, because there is no clear wiring, will also be regarded as a living room. I didn't care about it in the past few years, but now let alone gas water heaters, even natural gas cannot be turned on.
[Question 7] What is the principle of "zero cold water"?
zero cold water gas water heater adds a circulation pump inside the water heater. Before using hot water, let it circulate and fill the hot water pipes with hot water.
In this way, when using hot water, you can use hot water by opening the faucet. There is no need to drain the cold water from the hot water pipe before hot water can be released, as in the past.
[Question 8] Which users are suitable for "zero cold water"?
The "zero cold water" function does not save money. Although there is no need to drain water, it wastes natural gas (the water heater keeps heating during the cycle).
uses zero cold water heaters mainly for convenience. So the same is true for the suitable people:
First, you must not be short of money, and you are willing to use money in exchange for convenience;
Second, the room is big enough, and the cold water needs to be turned on for too long, otherwise there is no need to circulate it in advance.
[Question 9] What are the common faults of gas water heaters?
Gas water heater, first of all, it is a gas appliance. It can be compared to a gas stove: any problem that will occur with a gas stove may occur. For example, it cannot start a fire, it is easy to extinguish the flame, the flame is not strong, the combustion is insufficient, etc.
Secondly, it is a water heater. Problems that may occur with the water heater may also occur. Such as water leakage, scale blockage, etc.
[Question 10] How much does it cost to install a gas water heater? Although
is known as "free installation", it is rare to see anyone installing a water heater without spending a penny. Moreover, the installation cost of gas water heaters is slightly higher than that of electric water heaters.
Generally speaking, it costs about 300 yuan. In special circumstances, the fee may reach nearly 1,000 yuan. The fees charged by
include gas pipelines, water pipes, pipe fittings, brackets, etc. The farther the water heater is from gas pipes and water pipes, the more expenses it will incur.
[Question 11] Can gas water heaters be installed in all kitchens/bathrooms?
No, there are three hard conditions that must be met:
First, there must be a gas pipeline, and it must comply with the natural gas opening standards-big brand gas water heaters will be tested before installation.
Second, there must be hot and cold water pipes and power supply. However, they are generally found in the kitchen, and even if there is no special reservation, they can be connected to the pipes under the sink.
Third, there must be a flue hole leading to the outside (similar to an air conditioning hole), which is usually reserved by the developer. If not, you can drill the holes yourself. However, some properties in new communities may not be allowed.
[Question 12] Which functions are more cost-effective? There are two features of
that are worth choosing:
constant temperature. The water heater starts heating when hot water is used, and stops heating when hot water is not used. But there will be a delay, that is, the gas water heater will continue to heat for a few seconds after the faucet is turned off.
This results in that when the faucet is turned on again, the temperature of the water flowing out is very high - the constant temperature function cancels this delay.
constant pressure, we are taking a bath, and our family members are using the faucet outside. The pressure of the hot water suddenly changes, which will cause the bath water to be hot and cold. The constant pressure function means that automatically recognizes and adjusts the hot water pressure to keep the water temperature unchanged when the number of water points changes.
[Some pictures come from the Internet]
