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This residential solar domestic hot water (DHW) system was installed as an array of two (2) Viessmann flat-plate collectors mounted on the south-facing house roof (45° pitch and 190° azimuth). The collectors are arranged flush to the roof surface, and are configured as one (1) circuit of two (2) parallel connected collectors providing input into one (1) Peerless Partner stainless steel storage tank. This storage tank provides preheated hot water to the existing propane standing hot water tank. This existing hot water heater serves as the back-up source of heating for the house DHW. System energy production monitoring (in BTUs) is provided by a custom web-interfacing data logger at the storage tank. As designed, this system should produce 23,000 BTUs per day on average across the year given the site shading, which is over 66% of the Customer's average daily DHW usage.