When Jubilee was built the Webasto heater unit had, apparently, a time switch fitted. By the time we bought the boat the timer had failed, and the previous owner had substituted a simple on/off switch. This works fine and is ultra-reliable, but Ally and Ben would like to be able to wake up in a pre-warmed boat these cooler mornings.
I know, I thought, I'll use a mains time switch to supply a small power supply to operate a relay, the contacts of which will be connected across the Webasto switch. I had a small power supply, so all I needed was the relay. I looked in a Maplin catalogue and found something even better: a mains actuated relay. I didn't know these existed! The relay coil takes 230V AC mains.
And this is the time switch which I'll plug in next to the existing timer for the immersion heater (or in place of it - the Webasto will heat the domestic water as well as the radiators).
Cost of components: Relay £4.49; Time switch about £5.00. Total: about a tenner.
Compare this with £85 for a genuine Webasto timer! Of course, my method needs mains to work - fine for Ally and Ben in the marina on shoreline power, not so handy on the move.
I'll let you know how I get on installing it next time I'm on the boat.
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