I just had a quick look at the Sun Flux page - the elements are 240VAC. I couldn't find any DC elements. It sounds like the Sun Flux is an alternative to the Catchpower I use, with the exception that you replace the element in the HW service with their element. That may suit you more than a Catchpower if you don't already have an element in your HW tank.
I assume you are using solar power anyway so you have a use for any excess power after the water is to temp?
Al.
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