To prevent jacket type tank from cooling the 40 ° C hot water of the 400 liter tank during nighttime or consecutive holidays
On 2017-12-27 11:07:57
There are times when I use nothing without problems for 5 years, sometimes it breaks in one and a half years.
How long is the average life expectancy?
When arrived, the exterior box was torn and the heater bag was also torn.
I handed that the user could use it without problems, but it was not good as an impression.