Originally Posted by thrifty bill
The other decision you need to make is whether you need a self priming pump. If you are coming off the bottom of the water tank, the one above is fine. If you want to drop a suction hose down through the top of the water tank, you will need a self primer.
Some pumps are pretty noisy. One "advantage" of a noisy pump is you are less likely to leave it on!
I have mounted the type of pump I mentioned above in various locations, in line from the fresh water tank to the faucet, even up under the sink well above the tank.
It does not need a pressure shut off or a faucet with shut off valve, it is simply controlled by the on/off switch.
The ones I used were quiet and vibration free, just throw the switch and see the water flow... plenty good for a sink, but not enough pressure for a shower IMO.