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How Economy Seven works, and why you have it (if you do), by Mike the Boilerman. I'm often asked what the switches are for on the wall next to an off peak storage water heater such as a Pulsacoil. and which switches should be ON and which should be OFF. Tenants especially get told by the letting agent to just turn all of them ON, which is wrong and will lead to high electricity bills for the reason explained in the video. If you need more advice on this or if your Pulsacoil needs fixing, track me down at miketheboilerman.com