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This site uses Akismet to reduce spam. Learn how your comment data is processed. Heating · Cooling · Lighting. Tube-Works is based on the coast of Maine and designs innovative products for energy efficiency and comfort, employing Maine artists, technology experts, and skilled fabricators. How a hot tub works. The hot tub pumps water down from a filter through a system of pipework into a pump/motor which then pumps into a heating element and then into the hot tub itself. Controlling the temperature. Water temperature is controlled by a digital keypad on the top side of the spa. The majority of hot tubs have a maximum temperature. 17 reviews of Hot Tub Works "This is a tough call. I finally received my spa cover yesterday and, while the amount of time it took to receive my spa cover (/2 weeks from the order date) and customer support are still 1-star, I must admit the /5(14).