Can 'energy hog' hot tubs be made greener?

3 hours agoChristine Ro,Technology ReporterGetty ImagesMany holiday parks see hot tubs as a standard featureSome people give Severin Borenstein a hard time for having a hot tub.“Generally the criticism of owning a hot tub is it is a profligate use of energy,” he says.The main reason for such high energy usage is the heating, which generally runs even on days when the hot tub isn’t being used, to keep the water…