Work! (I can only think of two possible ratings - they either work or they don't.) I installed a 240 volt timer on my electric water heater (my house has a photovoltaic system connected - and my electricity tariff changes throughout the day - and thus my water clocked heating and other heavy applications saves money "selling" electricity to Duke during the day and "buying" electricity at night.) The timer came with just one off and one on - but there are two "cheap" periods each day utilizing Duke's strength, so I needed another pair.
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