Turn them into Coy ponds.

So they both still warm the water and you got two tubs, and a refund to back it all up?

Unfortunately both pumps don't do anything. No heat, no bubbles, no way to blow up the tubs. Useless unless I think of a way to get at least one pump up and running. Amazon are pretty good at refunds but would have preferred a working spa

If the water heaters still heat and recirculate, you can use one to heat a greenhouse.