We’re getting central heating installed next week. Being on Octopus Agile I want to take advantage of free/cheap (i.e. less than price of gas) electricity to heat the water in the cylinder. (Yes, gas boiler – long story!)
From my research a normally-open 20A contactor will do the job of switching the supply to the immersion on/off. Then I need something to switch the contactor. Shelly Pro EM looks to me like it does the job, as it mentions driving contactors.
I want DIN mounts as it’s tidy and I’ve got lots of space in the consumer unit. I’ve got a couple of Shellys already and been happy with them.
Am I on the right track? I’d to check before I call my electrician.
I did wonder if I could use the cheaper Shelly Pro 1, but that doesn’t mention contactor control. I’m guessing I would need to use that to switch 240V to the contactor. Reading this document for a slightly different application I wondered if I would need an RC snubber.
Thanks in advance for any help!