Hello.
After installation, of course, the solar must be filled with water. If you put cold water, the water will become very hot after being exposed to sunlight throughout the day. If you don't put water in your solar, it's like not putting water in a pot and burning it in a fire. What do you think will happen to the pot? Your solar energy will also run out.
It is better to fill it with water at first, then check after a while if there is still water in it, or if there is not much water. water, add water this way, keeping. solar energy filled with water is good for solar energy ah.
This is based on experience and I hope it is helpful to you.
AIA Solar Water Heater Store in Harbin
No. 1 Minsheng Road, Harbin 0451-89226967
http://www.365bxg.com/home-15101.html
Yuxin Sunshine Solar Water Heater
No. 280-1, Xianfeng Road,Daowai District, Harbin City 0451-83029481