The Grundfos Comfort System is a pump and valve combination that delivers you hot water in an instant to any faucet or bath in your home. The Comfort System uses a pump at your water heater along with the patented under sink valve beneath the sink furthest away from the pump. The Grundfos, 595916, recirculation pumps comfort systems patented combination creates a pressure differential that allows the cold and cool water in the hot water supply line to “by-pass" (at low volume) into the cold supply line through a thermostatically controlled valve that is mounted under the sink furthest from the water heater.

Applications: 
This combination works together to keep the water in your hot water line at temperature to provide “no-wait" hot water throughout your home. The timer on the pump makes it more efficient during downtime, like nights or mid-day. It’s quiet, maintenance-free, and keeps your water at a comfortable temperature.
 Features:

• Retrofits to existing plumbing
  
• No return line required
  
• Installs in less than one hour
  
• No electricity needed under the sink
  
• Built-in timer & line cord
  
• Uses less energy than a 25-watt light bulb
  
• Saves up to 12,000 gallons of water per year

Included in the box:

• One Grundfos UP15 circulator pump withi timer and cord
  
• One under sink thermal by-pass valve with mounting screws
  
• Two 1/2" FIP x 1/2" FIP x 12" flex hoses
  
• Installation and operation instructions