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Thanks Chas, can you explain any further about the goofy display numbers? Are you saying that while the display shows only 104 on those spas the water is actually hotter?I don't need as high as 108, but I know that 104 just feels like a bath to me and I enjoy 106. (Though I feel like a wimp when I visit a lovely backyard community tub in my town, which is kept at higher than 110!)