Question: What are the differences between "pre-built", "pre-cut", "outdoor" and "portable" traditional saunas?
Answer:

Pre-Built (Modular) Saunas come in modular insulated panels that are assembled together to form a fully functional room.

Pre-Cut Sauna Kits require that you frame up your own walls and provide your own insulation. Tongue and Groove boards from the kit are provided to attached to the inside framing of your room.

Outdoor Traditional Saunas are exactly like a pre-built's in addition to having a roof package option.

Portable Traditional Saunas are small modular rooms that are capable of plugging into standard wall outlets (15amp or 20amp).

Question: How do you hook up the electric heater in this room?
Answer: One cedar board is left off of a panel so the electrician can run the wire for the hard wire hook-up. The cedar board is then put into place to hide the wiring..

Question: Can I order the Polar Pre-built Sauna with External Controls for the Heater?
Answer: Yes, Polar offers upgraded heater options that have controls, which would be mounted on the outside of the sauna. You can view the different heater model details and options by visiting the Electronic Heater section of the website.