Review on SumpMarine Water Transfer Pump, 115V - Efficient 330 GPH Portable Electric Utility Pump with 6' Water Hose Kit - Perfect Solution for Removing Water From Gardens, Hot Tubs, Rain Barrels, Pools, Ponds, Aquariums, and More! by Joseph Stone

Pumps a lot of water but very noisy. We used it to circulate water from a homemade ofuro/hillbilly hot tub made from a 5ft tank. At the outlet of the storage tank bulkhead, we connected a Remes pressure washer filter that led to a pump that connected to a Camp Chef Triton L5 propane tankless water heater that sent the reheated water back to the tank. We connected the pump to an Inkbird temperature controller, which turns it on or off depending on the set temperature. We switched to a 12v DC solar system and now use a Flojet pump which is much quieter but not as powerful.