Would this off-the grid hot tub be perfect for your Gabriola deck? From Green Muze:

It is possible to be off the grid and still have a few luxuries like a hot tub. Dutchtub, is a portable, off-the-grid hot tub that runs on wood. The tub uses a hot-water convection system that heats the water and forces the heated water into the tub. The fire is contained within a re-circulating spiral column heat exchanger.

Through the heat of the fire, the warm water expands, forcing the water flow up the spiral tubing and out of the upper pipe, back into the hot tub. The pressure of [continue, see photo]

The company’s website is at DutchTub.com.