This pool heater is truley unique. It uses the heat stored up in the attic to heat swimming pools. There are no solar panels to disfigure your home or landscaping. It doesn't void your roof warranty like traditional solar panels do, and It is not subject to HOA covenants. To find out more you can go to two different web sites. www.greenwisesolutions.net this site has a link to a current news segment featuring the PCS2 system on Tampa 10 News an ABC affiliate. SolarAttics main web site is www.solarattic.com