Using clean energy, why are many communities not allowed to install solar water heaters?

There are several reasons why solar water heaters are not allowed to be installed:

The residential area is limited. Solar water heaters are generally installed in sunny places, and will be selected on the roof, with limited area.

Take a look at the delivery contract you signed with the property, depending on the area. Different regions have different regulations. For example, the third paragraph of Article 28 of the Regulations of Shanghai Municipality on Residential Property Management stipulates that it is forbidden to build buildings and structures on patios, gardens, platforms, roofs, roads or other sites.