Quality+maintenance = long life
The life of solar water heater depends not only on its origin (quality), but also on your care (maintenance). High-quality and well-maintained water heaters can be used easily 15 years or more!
10 year is not the end point.
Although many brands claim that the product life is as long as 15 years, the real situation is that the life of heating pipes is usually only 10 years. Beyond this time limit, the safety factor will greatly decrease and the risk of electric shock will increase, so it's almost time for 10 to consider upgrading.
Pressure-bearing type and falling water type
There are two kinds of solar water heaters: pressure-bearing type and submerged type. Which one to choose depends on your needs. But in either case, quality is the key! Stainless steel liner and enamel liner are the mainstream choices, and the general service life is about 15 years.
Brand+quality = rest assured
Don't be fooled by the inferior materials used in small factories! When buying, you must identify the brand and ensure the quality. Otherwise, your water heater may "strike" in 2-5 years, and then you will have a headache!