This solar roof hook pump will also usually pump

The sun heats the water in the collector and once it reaches a desired temperature, a sensor device activates the circulation pump which starts to pump the water into the storage tank on the ground. This solar roof hook pump will also usually pump the cold water from the bottom of the storage tank up into the collector

The 2 systems are pretty similar in their efficiency and the choice is most likely to be made on what fits the house structure best or cosmetically is preferable.

There are millions of homes with an attached deck or patio, and many of them have a single, wall-mounted lighting fixture that illuminates the space after dark. This is often an unappealing sort of "spot" light that most people would rather avoid. The most common answer when using the area after sunset is to use candles, solar carport torches or other temporary lighting sources, but of course these can be costly, time consuming and even dangerous. They also don't provide any real or durable illumination.