So the tape isn't needed?
Sorry for the delay. I was out walking the pooch.
Where are you wanting to install the wire? I'm putting mine underneath carpet, and everything that I've read says to not use an adhesive or tape to secure the wires. It's also recommended to put the wires between the pad and the carpet. I had planned on taping the wires down to the concrete and have the pad and carpet put over the top, but I definitely need to think about it before I do it.
The stuff that I bought at geckocable.com was 16-gauge, 4-conductor, 25'-long wire for about $60 a spool. I haven't installed it, but it arrived quickly and came with flat-to-round connectors for both ends of the wire.