Heater is equipped with an automatic reset. A wide variety of bath tub water heater options are … Find whirlpool tub & air bath heaters at Lowe's today. Pushing the re-heat button will keep the bathtub water warm for about 1-4 hours. One input, one output. When you are taking a bath, it is capable of providing constant hot water for you. Quick Ship available. Once filled, the temperature of the whirlpool bath is constantly maintained by a built-in thermostat for as long as you desire. 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Since tankless water heaters supply endless hot water, you don’t have to worry about capacity, but instead, think in terms of water flow rate. An efficient model can help save on utility bills. Most bath tubs requiring inline heaters use 1.5” plumbing, but a few Jacuzzi® brand bath tubs use 2.0” plumbing. Specifications. How does it work? This heat line cable is approved for use in drinking water supply lines. Prime members enjoy FREE Delivery and exclusive access to music, movies, TV shows, original audio series, and Kindle books. Shop Jacuzzi Rapidheat Inline Water Heaters For Jacuzzi Bathtubs. I have not done this myself, but I am considering. ! 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