Drain Water Heat Recovery Systems

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November 11, 2016
Drain Water Heat Recovery Systems

Drain Water Heat Recovery Systems

Drain water heat recovery, also called water heat recycling, wastewater heat recovery, drain water heat recovery, or greywater heat recovery makes use of a device called a heat exchanger to reuse heat and recover energy from wastewater as it moves through the drainage system. Based on the type of drain water heat recovery system you employ it is possible to recover energy from various activities such as showering, washing dishes, and using the clothes washing machine.

You likely understand the major amount of energy your water heater uses in the average household. Unfortunately, we use a lot of energy to heat up the water for or a shower or to do the dishes only to use it for a few seconds or minutes. And then energy goes down the drain along with all of that water. Though drain water heat recovery is one way you can reverse this trend with an upgrade to your home plumbing.

Drain water heat recovery uses heat exchangers to accomplish the task. These are similar to the heat exchanger used in your refrigerator that is removing the hot air from inside it. Only now, when the hot water flows away, the remaining heat is trapped by the heat exchanger so it can be used again to heat water immediately or store it again for use later.

Some drain water heat recovery systems have a complementary storage tank to your water heater’s storage tank. These systems are robust and enable you to trap wasted heat from additional appliances such as your dishwasher and washing machine. Actually, they can also preheat clean water as well which decreases your hot water heater’s energy consumption.

There are other types of drain water heat recovery systems that do not actually store water, yet make use of the heat from wastewater when cold and hot water are being used simultaneously like when you’re showering. These types of systems use a heat exchanger which traps energy from copper pipes directly and puts it to good use.

Recycling from a shower is usually around fifty to eighty liters of water and a bath around one hundred to one hundred and fifty liters. While the wastewater temperature is generally around twenty to twenty-five degrees Celcius. A drain water heater recovery recycling tank will hold approximately one hundred and fifty to one hundred and seventy-five liters of water so it is able to hold nearly all wastewater needing to be stored.

Eighteen percent of the utility bill for the average household can be attributed to heating water. Drain water heat recovery systems can save around sixty percent of the heat energy that is generally lost. A wastewater heat recycling system reduces the energy consumption in the household and by doing so it also reduces the energy dependency as well as the greenhouse gas emissions.

While a typical drain water heat recovery system will cost between four hundred to one thousand dollars the investment will likely be paid back between two and ten years. Independent studies have shown that drain wastewater recovery systems will save hundreds of kWh of energy per person, per year. A smart investment indeed. If you’d like professional assistance with installation, repair, or maintenance of your water heat recycling system give your local plumbing experts a call today!


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