There are two different types: flat plate, where lots of thin tubes carry water through a flat absorber panel, and evacuated tube, where vacuum glass tubes capture the sun’s energy directly. There is little difference in performance between the two but evacuated tube panels do more obviously extrude from the roof.
Caersws
Caersws is a town as well as community on the River Severn, in the Welsh region of Powys (Montgomeryshire) 5 miles (8 km) west of Newtown, and also midway between Aberystwyth and Shrewsbury. It has a station on the Cambrian Line from Aberystwyth to Shrewsbury. At the 2001 census it had a population of 1,526, raising somewhat to 1,586 at the 2011 Demographics. In contemporary Welsh, Caersws essentially suggests "Ft Kiss", although sws almost certainly stems from a few other source. It has been argued that the website may keep a Roman-era dedication to Zeus or protect the name of a conjectured British queen Swswen.