Instantaneous electric water heaters appeared in 1988.When I first saw this time, I was surprised: it stands to reason that a product that has been around for 30 years should be very mature. But how can instantaneous electric water heaters still be tepid,Even few big brands are willing to produceThis?
I just spent half a day studying buyers' reviews and consulting friends around me, and found a fact: most users are worried about 6 things - this is the main reason why instantaneous electric water heaters have never been able to sell well.
Before you buy: worry about safety and power consumption
"Instant heat" refers to the instant heating of water, for electric water heaters, if you want to heat water instantly, you must need enough power:Power is the most critical factor affecting the heating speed of an electric water heater.
So the power of instantaneous electric water heaters is very large. Generally, it starts at 5000w, and the common instantaneous electric water heaters on the market are 6000w and 8000w. So the user's concern arises:
High-power household appliances cannot use sockets, and need to be used with surface-mounted leakage.
With such a large amount of power, will the power consumption be higher? After all, in junior high school physics class, we all learned an electrical formula: power consumption = power time.
High power will inevitably produce high current, so if you are electrocuted, will it be more harmful to the human body? Especially when I see that the price of instantaneous electric water heaters is only a few hundred yuan, I am even more worried about this problem.
ObuchiI want to "refute a rumor" here:
I don't like instantaneous water heaters either, but I'm a bit unwanted to worry about power consumption.
Although the power of tankless electric water heaters is high, the operating time is very short. Therefore, the power consumption formula of the electric water heater should be usedPower Consumption = Specific Heat Capacity Rising Temperature CapacityFrom this set of formulas, power has no effect on power consumption.
When buying: Worry about safety and fees
When users finally make up their minds to buy an instantaneous electric water heater and go home, they will face a new problem: pull the product detail page to the bottom and you will see the alarming installation requirements
6mm copper wire, 63A main switch and 60A meterThese three requirements have passed 80% of home users. Because in most home environments, the thickest wires are only 4mm, and the main switch is 40A.
What happens if the installation conditions are not met? The answer is that it can trip frequently or cause a fire.But there are still people who buy instantaneous electric water heaters home, and they either areGo on a big fightto carry out a large-scale transformation of the circuitry in the home. Either thatPreparation starts from the time of renovation, directly laid a suitable circuit.
These two types of users will worry about another thing before placing an order: Is there a charge for installation?
I've read a lot of cases in buyer reviews and have come up with one fact:The installation of instantaneous electric water heater is really informal! It is not like electric water heaters and gas water heaters, which have a clear bill of materials.
Due to the large differences in installation environments, the types of accessories used are also different. In addition, most of the manufacturers of instantaneous electric water heaters are small brands, and after-sales are generally outsourced to third parties, and there is a lack of corresponding supervision
Just like the bad review in the picture above, if an exposed electricity leakage, some people will not be charged, but this user has encountered a charge. It is not clear whether to charge or not, which shows how serious the problem of indiscriminate charging is in instantaneous electric water heaters.
After use: Worry about water temperature and water pressure
When you finally install an instantaneous electric water heater, the next questions are even more overwhelming. Judging by the information collected by Obuchi,Only users in Guangdong and Hainan can use it normally, and other regions will encounter two problems:
Problem 1 Insufficient water temperature:The maximum power of 8500W is already very high for home appliances, but it is still not enough for those who want to heat the bath water instantly. Let's take a look at the bad reviews first
"Whether the water is hot or not" is almost a common problem. Especially for both kinds of users:
In the north, the outdoor temperature is low in winter, and the initial temperature of tap water is less than 20.
A large overhead shower was used, and the water flow rate was more than 5 l min – take a look at the shower flow rate recommended by the merchant
Problem 2 Insufficient water pressure:The problem of "constant temperature and constant pressure" has always been a big problem on instantaneous water heaters (including gas water heaters), and it has taken 20 years for gas water heaters to solve it, and now it is the turn of instantaneous electric water heaters.
The problem of constant temperature and pressure refers to the fact that after the shower is turned off and turned on for a short time, the water that flows out first is hot water, followed by cold water, and then the bath water with normal water temperature. I take a shower in the bathroom and my family washes the dishes in the kitchen, which also makes my bath water hot and cold.
The problem of constant temperature and pressure is mainly because the water heater does not respond fast enough to quickly change the heating temperature according to the water flow. Gas water heaters can solve this problem by quickly adjusting the ratio of water flow to gas intake through a water volume servo. But in the case of instantaneous electric water heaters, there is no relatively perfect solution.
Obuchi丨Text. Selfie + Network (Invasion and Deletion)丨Figure.