7.5 meters. The floor height of an ordinary community house is 3 meters, and if it reaches the top of the 7th floor, it will need a length of 7.5 meters. The size of solar hot water pipes is generally: 1.6 meters 47 or 58, 1.8 meters 47 or 58. Normally, 20 gauge pipe is used. It depends on where the solar water heater is placed on the 6th floor. If it is far away, it must be at least 10 meters, and the upper and lower water pipes are the same. Solar tubes and vacuum tubes of solar water heaters are the essential components of solar water heaters and are known as the "heart" of solar water heaters. The quality of vacuum tubes directly affects the lifespan and performance of solar water heaters. the solar industry has also stimulated the development of vacuum tube companies.
It is more cost-effective to install a solar water heater than an electric water heater.
You must first review the regulations in force on your property.
The roof of the building is a public establishment. It's just polite to agree in advance with the people on the sixth floor.
As for the pipes, you can go along the exterior wall or follow the rainwater pipes.