rmb to install a water pump as soon as the piping is ready. If there is any leak, ur plumber is responsible to rectify it. If they finished their work and left, it would b hard to get them back to fix it.

For Grundfos Ch-PC pumps like weikee's 1, just turn off all the tap fittings and if the pump operates, it means somewhere is leaking.

For UNI E and PT pump (with a tank) like the one u bought, u nd to look at the gauge at the pump. If u c the pressure drops while all the taps are closed that means u have a leak.