Examples of Recirculating Pump System that the pump is installed remote or at the Hot Water Tank or Tankless Water Heater, but uses existing water pipes and no need for a dedicated pipe like traditional pumps. Generally, you want to install the Pump as far from the Hot Water Tank as possible so that as many hot water fixtures as possbile will have hot water. Also, most of the time, they are installed in a batroom.
When you need hot water, you hit a button for the Chillipepper for hot water and the Pump turns on. With the Grundfos 10SU7/TLC it keeps the sink or bathroom hot water line hot with a wax valve at a sink and the Pump at the Tank. The Laing ACT-303-BTRW is installed at a sink and keeps the water in the line hot when you need it.