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I would guess there would be no heat impact on the climate. The same heat was already in the climate, it’ll be expelled in a similar way.
Fossils fuels extract stored energy and burn it, but it’s not the heat they create that warms the climate. It’s the CO2 they release that reduces the rate at which heat is expelled from the planet causing additional energy to be retained.
This type of technology may reduce climate change if it’s used instead of desalination powered by fossils fuels. Or if the heat that was generated was captured and used for heating homes instead of fossils.
The amount of energy we get from the sun far exceeds how much energy we can produce. We can’t really impact the climate by cooling and warming the planet directly. It’s leveraging effect of greenhouse gasses insulating the planet which causes climate change.