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Hot Water Recirculation Systems

The Metlund® Hotwater D'Mand® System

The Metlund® Hot Water D'MAND® System consists of an electronically controlled pump and valve assembly that allows for the rapid delivery of hot water to plumbing fixtures without the loss of cold water down the drain.

The D'MAND System is activated when someone creates a demand for hot water by activating the pump with any one of a number of methods. At that time, the Hot Water D'MAND System pumps the hot water to the plumbing fixtures. Once hot water reaches the pump, the System detects a 3° to 4° temperature rise and completely shuts off so there is no loss of energy or water!

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The Metlund D'MAND System is the only UL Listed and Uniform Plumbing Code Listed hot water distribution system that is recognized by the US Department of Energy to save both water and energy.

 Uniform Plumbing Code Logo


Its features include:

  • Automatic "fail-safe"
  • 3-year (S-50) or 5-year (S-70T and S-02) warranty
  • Life expectancy 15 to 20 years
  • Less than $1.00 a year to operate
  • Delivers hot water within seconds to more than one fixture
  • Delivers hot water without wasting cold water down the drain
  • System only operates when there is a demand for hot water
  • Simple installation for new and existing homes
  • Works with all standard water heaters (gas, electric, tankless, or propane)
  • Title 24 Compliance (CA only)
  • "No Sweat" easy installation package available with optional remote control button
  • IAPMO "Uniform Plumbing Code" approved
  • UL Listed

How it works

At the push of a button, the Metlund® Hot Water D'MAND® System circulates the ambient temperature water in the hot water pipes (water that is normally lost down the drain) back to the water heater. This occurs up to 80% faster than just letting the water run down the drain—the usual scenario. Depending on the plumbing layout, the route and time can vary. The Metlund D'MAND System moves the water so rapidly, that hot water arrives at the fixtures before the heat is lost through the pipe.

As the ambient temperature water in the cold water line travels towards the hot water heater, the D'MAND System fills the hot water line with hot water. When the hot water reaches the D'MAND System, a thermal sensor (thermistor) senses a temperature rise and quickly closes the zone valve while it shuts the pump off. The sophisticated electronic circuitry that does this is attached to the high-performance pump housing.

This results in getting hot water to the fixtures four to five times quicker (on average), greater convenience in not having to wait, a savings in water and energy, and a reduction in sewage costs. As a by-product of these savings, a cumulative result is the improvement of air quality.

The Metlund D'MAND System can utilize the cold water line as a return line or use a dedicated return line. By using the existing cold water line, it is easy to retrofit existing homes or businesses. Special plumbing is not needed, and since the System will not allow for hot water to cross over to the cold water line, all the cold water fixtures still have cold water.