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Another suggestion, put some insulation around the pipe/garden hose that leads to the tub. You are dissipating a lot of heat into the ground or air as the water travels from the heater to the destination. http://www.homedepot.com/p/Everbilt-7-5-in-x-3-ft-Wall-Pipe-Insulation-R3-1-4-Pack-P20EB/205181982
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