The 315L Sunmaster Flat Plate System with 2 Collectors is a high quality system that has been developed by Rinnai, a leading industry supplier of solar technology for over 45 years. The system consists of a ground mounted storage tank and roof mounted collectors that can be installed separately. There is also no need to reinforce your roof and the collectors will have minimal impact on the aesthetic of your roofline. The system uses a small pump to circulate the water from the cylinder through to the collectors to absorb the maximum available solar energy.