hi folks, to keep water temperature nearly constant at a low level of noise, i want to pump continually, at just a couple of GPM. i have done the math on the temperature of water coming out of my small gas heater and the PVC should be fine. pool pumps are generally way too big for this application - i want something in the 1/10 HP range to achieve maybe 4 GPM with about 9 feet of head. i have been reading about hot water circulation pumps (grundfos, taco - grounded but not rated for outdoor use), aquarium and fountain pumps (eheim - immersable but with a warning to unplug before touching the water). does anyone know whether there is an increased risk of shock to bathers when using alternative kinds of pumps?
thanks in advance for tips.