Suitable for 30 people to use solar water heater vacuum tube
Every day, about 30L of water, each of the 20 square meters of heat collection area of about 4% of the heat of the water (four seasons Mu space tube calculation)
This is not the number of vacuum tubes, but to see the lighting area of solar energy and the capacity of the tank to determine the
30 people with about 900L hot water, and 900L water about lighting area of about 18 square meters.
