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I have a hot tub which i have on a moveable platform which can be towed by car or placed on a floating dock. I have been told it would more than several heavy truck batteries to use Point of Use or Intex water heaters to heat it. What would be my best option, such as wood, propane, etc to heat it, especially in the cold danish winters? I plan to put a greenhouse walls around it.Also, i plan to have about 10 or so not perfectly showered people in it each day, whats my best option to keep it clean, such as salt filer, chlorine, etc?Also, for bubbles, im planning to use one or more portable hand inflators for air matress with hose inputs in the side, any better suggestions?Thank you