Drain Water Heat Recovery – What Is It? - Parker & Sons

Heat, energy use, and energy efficiency are popular topics here in Arizona. In fact, they are popular topics here in the Parker & Sons’ offices as well. Most of our time is spent talking about ways to heat things up or cool them down while doing so in an energy and cost efficient manner. Technology in the home services arena is always changing and evolving. It is our job here at Parker & Sons to stay up to date with the latest in technology and techniques in order to better service our loyal customers. One new technique for improving energy efficiency and reducing waste water is drain water heat recovery (DWHR). So, what is DWHR and how does it work?

Explaining Drain Water Heat Recovery

Heating water for use in showers, dishwashers, and washing machines takes power. It takes energy. This energy is transferred into the water to keep heat it. In a traditional setting that hot water is used briefly and then takes a tumble down the drain. That water is still hot when it is draining away. That means it is still full of energy. The thought behind drain water heat recovery is, why not use that energy?

How Drain Water Heat Recovery Works

Drain water heat recovery is a simple yet brilliant idea. There are a few ways to execute drain water heat recovery in a home, apartment complex, or business. We will discuss one such way here today.

Traditional pipes are replaced with pipes which have been enhanced with copper heat-transference coils. As hot drain water passes through these pipes, it heats the copper coils. Next, as cool, fresh water enters the home it passes through the heated copper coils. The fresh water is preheated before it ever reaches the water heater tank. This means that the water heater will expend a lower amount of energy to bring that fresh water up to temperature.

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