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 Specification Sheets Tank Diagrams Cold Water Stop
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Dedicated Recirc System D - C - Tankless D - C - Standard Plumbing Diagrams
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WaterQuick Products for Dead-end Plumbing

Dead-end Products - Tank and Tankless

WaterQuick Standard (WQS)
Tank Water Heaters

WaterQuick Tankless (WQT)
Tankless Water Heaters
Image of a tank water heater with 2 branches and a recirc pump.

Click diagram to enlarge. 		Image of a tankless efficient water heater with 2 branches lines and a recirc pump.

Click diagram to enlarge.
How It Works

The problem is that there is a lot of cold water in the hot water line between your water heater and the water fixtures in your home. That water must be moved out of the way before you get hot water.

The water can either go down the drain or go back to the water heater. For many reasons going back to the water heater is a better choice.

Three components are required to achieve this:

  • Circulation Pump - installed in the hot water line at the water heater
  • Flow Monitor - a flow switch that controls the operation of the pump
  • Advanced Bridge Valve - a connection between the hot and cold lines under the furthest sink

Before a circulation system is installed in a home the hot and cold-water pressure is balanced. By adding a pump to the hot water side, the balance is temporarily disrupted so that the cool water in the hot line can crossover into the cold line and go back to the water heater.

In our systems, the pump and Flow Monitor are installed at the water heater and the Advanced Bridge Valve is installed under the furthest sink.

When a hot water faucet is turned on and then off, the Flow Monitor senses the movement of water through the water heater and immediately turns on the pump. The balance between hot and cold is broken and the cool water in the hot line is pushed through the Bridge Valve into the cold line and back to the water heater.

When hot water reaches the Advanced Bridge Valve which has a temperature sensor built into it, the valve closes (you do not want hot water in your cold line. Hot water is available without wasting more than a cup of water down the drain.)

Note: If hot water is present in the Bridge Valve the pump would have shut off because there is nowhere for the water to go. However, any time a hot water faucet is on the pump will be running.

Plumbing Configurations

There are 3 types of plumbing configurations in most homes:

  1. Dead-end - water pipes that end at the last fixture on a line (homes may have 2 or more dead-end lines)
  2. Dedicated return line - a water line is installed from the last fixture back to the water heater
  3. Hybrid - a combination of dead-end and dedicated return configurations

All three plumbing structures include either a traditional tank water heater or an energy efficient tankless water heater.
Advantages
True On-Demand Operation:

A demand from any hot water faucet or appliance in the house will activate the pump.

  • No buttons
  • No remotes
  • No motion sensors
  • No timers
 Saves Energy:

As hot water moves through your house, it cools off and needs to be reheated.

By turning off the recirc pump when there is no demand the hot water stays in the water heater which is much more efficient at keeping heat.

  • Studies show that hot water is used less than 2% to 3% of the time. That means, 97% or more of the time you could be saving energy!
  • Extends the life of your pump, pipes and water heating equipment.

Reduces Leaks:

Stopping hot water from circulating in your hot water pipes virtually eliminates pinhole leaks.

  • It allows your water pipes to "heal" themselves by reforming a thin patina on the surface of the pipe
  • 87% of all leaks occur in hot water pipes
Works with tankless water heaters:

Turning on any hot water faucet will start the pump and the water heater. 3 minutes after the demand ends both the pump and the water heater turn off.

  • Does not void manufacturer's warranties like timers or continuous operation will.
Note: Time can be adjusted up or down to better fit your needs.

Dead-End System Includes:

Each system contains all of the equipment you will need to convert one dedicated hot water return line to a True On-Demand hot water delivery system.

Circulating pump
flow switch for recirc pump
Image of Advanced Bridge Valve components.
Circulation Pump Flow Monitor Advanced Bridge Valve

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