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Making and testing a simple circuit for obtaining sinusoidal voltage from a UPS unit. Modifying the UPS. Connection and testing on a gas water heater. Circuit for repetition, experiments with the circuit. Contents: 00:00 - Introduction 00:53 - What is at the UPS output 01:20 - Necessary modifications to the UPS 04:14 - Disabling green mode (timer) 06:36 - Choosing the best circuit 08:02 - Testing the 180W circuit 10:33 - Testing the 300W circuit 12:12 - The final circuit. 13:28 - Testing on a gas water heater