Recirculating Pumps

Download Brochure (.pdf) | Introduction to the Metlund D'MAND System 0.8MB

Arnett’s Plumbing, Inc. can help you have hot water in 15-30 seconds (depending on the size of the home and water system) without wasting a single drop and by using only a fraction of a penny's worth of electricity.

The Metlund® Hot Water D'MAND® System (a high performance pump, integrated controller and electronic zone valve), requires no special plumbing. It is designed for use with tankless water heaters to provide energy and water savings. Arnett’s Plumbing, Inc. can easily install in new or existing homes or businesses.

Savings of energy and water, plus extending the life of water heaters, has a significant return on investment. Since eight out of ten homes have long waits for hot water at one or more fixtures, it is easy to see the added convenience and cost savings of instant hot water delivery.

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. Clickdiagram for larger version.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.