In your case, we would recommend you installing our WDS150K saltless whole house descaler. If you run the system 20 feet away, there won't be enough wire to wrap around to have a dramatic effect on the water. We recommend installing the system no more than a couple feet away from the pipes. An extension cord perhaps is your best bet.
We don't support modifying the system in any way, and doing so voids the warranty. If you had to extend the wires or replace them entirely with longer ones, you would do it at your own discretion.