The Grundfos PM Rain is an interconnect device that allows you to utilise your harvested rainwater for toilet, laundry and garden applications, with the added benefit of mains water backup.

The PM Rain is used in conjunction with a Grundfos pump. The pump itself is only activated when rainwater is being drawn from the tank. It does not operate when switched to mains.

The PM Rain automatically starts when a demand is sensed - for example the flushing of a toilet or filling a washing machine - and will switch over to mains water when your tank is empty or in the case of an electrical failure.

Grundfos has incorporated a specially designed valve eliminating the need for an in-tank float - drastically decreasing installation time and making the PM Rain suitable for bladder tank installations.