My comment actually agreed with your term ... solar collector appears to be the correct term.
No we don't, and we have no plans to install one. The price is prohibitive and the unit is taxed so the return of capital is around 13 years ... and we intend relocating to Europe in (hopefully) two years time. An argument could be made that it will increase the value of our property but that is a moot point as our property is probably over capitalized already for the area in which we live.