The vacuum tubes of solar water heaters are generally produced in a standardized manner. The diameter and length of a manufacturer's vacuum tubes are the same.
The heating capacity of the 24 vacuum tubes of the solar water heater is not as large as that of the 30 vacuum tubes - the more vacuum tubes, the greater the heating capacity of the solar water heater. water heater is strong.
If it is for domestic use, a 24mm vacuum tube is sufficient. If it is a dormitory or hotel, it is strongly recommended to purchase a 30mm vacuum tube.