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Review of ‘Solar Water Heater Designer‘ by Tim Rossetti (Timex), a BASIC engineering program for the TS1000/TS1500. Calculates heat gain in BTU/sq ft per month, annual fuel savings, and optimal collector area based on city, angle, efficiency, and daily hot water usage. Notes shortcomings: no print routine, oversimplified efficiency model, and assumes tank size equals daily usage.