. . . . membership updated.

A couple of points:

1. Your timer needs are determined by the pump motor specs: voltage, amps, run time, pump speeds.

2. If you have 2 pumps (pool and vacuum, etc.), you may want a SINGLE integrated timer. With 2 timers, if they get out of sync, the vac pump can be turned on when the pool pump is off . . . damaging the vac pump.

3. Electromechanical timers are more reliable than electronic timers, which can die during thunderstorms.

4. Outdoor timers need outdoor cases . . . which cost extra. Alternatively, build a tiny 'shed' roof over your timer board.

5. It's possible to turn a 240V pump off using a SPST (one switch) timer, but doing so leaves 120V present on one of the power leads, creating a shock hazard for unsuspecting service people (or homeowners). Use a DPST (one switch for each power line) on 240V pumps.

6. Example timers at Amazon:
24hr 120v timer (SPST)
24hr 240v timer (DPST) in a plastic outdoor case
24hr 240v timer (DPST) in a metal indoor case
2 Timers, arranged to provide Hi/Lo/Off control of a 2-speed pump