Unfortunately, our current smart thermostat solution can only be installed during the water heater manufacturing process. This is why our customers can be only water heater manufacturers and companies dealing with water heaters manufacturers.
They mentioned that in the future they might consider selling to the private market. Ill send them a poke again and update on their reply
That’s a shame, they’d probably do well selling it as an aftermarket product - there are a lot of posts from people trying to work out how to control water heaters in a smart way.