The Sunmaster Flat Plate System 315L with 1 Collector is a cost effective and highly efficient system that consists of a ground mounted storage tank that is installed separately to the collectors. A small pump circulates the water from the cylinder through to the collectors to absorb the maximum available solar energy. There’s no need to reinforce your roof structure for installation. Developed by Rinnai who have been providing reliable, innovative, and durable products for over 45 years.