I would like a timer for a 3 Kw water heater at our local village hall. At the press of one button the heater will be on for two hours, then be switched off until the next press. Many thanks, Gerald.
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If you want a push button timed circuit search "timer relay" but you will then need to add additional components. As an alternative what about a timer that you rotate as used on tumble driers? https://uk.rs-online.com/web/p/timer-relays/5362779/
You will then only require an enclosure and can even set a shorter time if required and it will be limited to two hours max from when last set.