How Much Water Do Dishwashers Use?

How much water does a dishwasher use? This is a valid question if you're looking for ways to lower your household water bills. Per the most recent federal regulations, standard dishwashers manufactured after May 30, 2013, can't use more than 5 gallons per cycle, while compact units can't use more than 3.5 gallons.

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That said, these guidelines don't offer a lot of detail about how much water your specific dishwasher uses.

Dishwasher Water Usage

When your dishwasher was manufactured can have a big impact on how much water it uses during a cycle. Dishwashers built between 1994 and 2013 can use from 5 to 10 gallons of water per load, while those manufactured before 1994 can use up to 16 gallons. Here's a look at other factors that can affect how much water your dishwasher uses:

• Energy efficiency: Energy Star-rated dishwashers are designed to use less energy and water than regular models.

• Dishwasher size: Compact dishwashers use less water than standard models, but they have smaller capacities and don't hold as many dishes. This may mean you end up running the appliance more often, offsetting any size-related water savings.

• Cycle type: If you select a heavy-duty or sanitize cycle, your dishwasher may use longer wash and rinse phases, and more water, to remove food debris or help kill bacteria. On the other hand, the dishwasher will use fewer gallons of water if you choose a quick-wash cycle.

• Load size/dish placement: Overloading your dishwasher or loading dishes so they face away from the spray arms can leave some dishes dirty. If you have to run the dishwasher a second time, you can end up using twice as much water to clean that one load.

• Maintenance: Keeping your dishwasher well-maintained ensures it operates as efficiently as possible. Periodically checking the filter and spray arms for blockages and inspecting the unit for leaks can help lower the risk of issues that may increase water usage.

How Much Does It Cost to Run a Dishwasher in a Year?

The average cost to run a dishwasher for a year is $40.54 (CAD 56), based on running 215 cycles. This breaks down to $37.77 (CAD 52) for electricity and $2.76 (CAD 3.77) for water costs. The $2.76 (CAD 3.77) a year translates to $0.013 (CAD 0.018) per load and $0.23 (CAD 0.31) per month.

What About Energy-Saving or Water-Saving Cycles?

Many of today's Energy Star-certified dishwashers offer soil-sensing capabilities to automatically adjust the cycle length and water usage for each load. Some standard models can clean a load using as little as 2.6 gallons of water, while compact models are available that use just 1 gallon per cycle.

How Much Water Do You Use While Handwashing Dishes?

According to HomeGuide, washing a full dishwasher's worth of dishes by hand can use up to 27 gallons of water. This is substantially more than the 5 or fewer gallons a dishwasher uses during a typical cycle. If you have a new, efficient model with water-saving features, running a cycle might consume as little as 1 to 2.6 gallons.

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Using a Dishwasher Vs. Handwashing Dishes

When you consider the significant difference in the amount of hot water it takes to handwash vs. run a load through the dishwasher, it can be more efficient and cheaper to use the appliance, especially if you have a newer model and only run it when full.

Ways to Use a Dishwasher More Efficiently

There are various steps you can take to make sure you use your dishwasher as efficiently as possible, such as:

• If your dishwasher has an energy-saver, eco-wash or quick-wash option, be sure to use it whenever possible.

• Avoid using prewash, sanitize and heavy-duty cycles unless absolutely necessary, as these cycles use more water.

• Always run full loads to get the full benefit of the energy and hot water the dishwasher is using.

• Scrape but don't rinse your dishes before putting them in the dishwasher to minimize hot water waste.

• If your current dishwasher is more than 10 years old, consider updating it with a more energy- and water-efficient model. To maximize efficiency, look for Energy Star-certified dishwashers, and compare the water-saving features of different brands and models.

All CAD conversions are based on the exchange rate on the date of publication.