I think the actual sidewalk and driveway melters use water piping within the concrete but I’m guessing re-pouring concrete is not an option?
Nope! I’m more thinking of something I can lay over the sidewalk that the hot air from the miner can blow through (and out?) to melt it over time.
How far roughly will the S9s be from the sidewalk?
Planning on enclosing it in a cooler so it can sit outside at one end of the sidewalk, near a corner of my house and only a foot or two from an exterior outlet. It won't need more than a foot or two of a flexible arm right off the cooler before connecting to the perforated part.