When I bought my Wave 3 I bought the complete kit. Which included the heater, feet and a hose with regulator. The first time I used it I placed the heater with legs on the closed cover of stove top and the tank on the floor. Worked very well. Now I hang the heater from a cabinet with a hose which is connected to an outside BBQ connection. I ran the hose through the LP tank bay into a small cabinet under the fridge.. If one reads the instruction manual you'll see that it only takes a few sq inches of ventilation to satisfy the requirements.
Instead of a large 20 lb tank you can get a 5lb tank if you wanted to go that direction.