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The Therm Products 1500-Watt Universal Flow Though Whirlpool bath heater is designed to replace the current water heater on your Whirlpool bath unit regardless of brand. It is also a great addition for those who wish to add a heater if none came with your Whirlpool Tub. It is designed to work with any brand Whirlpool bath on the market. The unit uses a flow through switch to turn it on when the water flows through it so no electrical switch is required.