Dishwasher Energy Efficiency: How Much Does It Really Cost to Run?

Modern dishwashers are remarkably efficient. But there's still a meaningful cost difference between models. Here's what you need to know.

Average Running Costs

A typical dishwasher costs $25-$45 per year to operate, depending on the model and how often you run it. Here's the breakdown:

Component	Average Annual Cost
Electricity	$15-$30
Water	$8-$15
Detergent	$40-$80
Rinse Aid	$10-$20
Total	$73-$145

Energy and water costs are surprisingly low. Detergent is actually the biggest recurring expense.

Energy Star Certification

Energy Star certified dishwashers use about 12% less energy and 30% less water than standard models. Over a 10-year lifespan, that saves roughly $40 in energy and $200 in water.

The certification is worth looking for but shouldn't be the deciding factor. Almost all modern built-in dishwashers from major brands are Energy Star certified.

Dishwasher vs Hand Washing: The Real Numbers

Hand washing uses significantly more water and energy:

Method	Water Per Load	Energy Per Load
Dishwasher (standard)	3-5 gallons	1.2-1.5 kWh
Dishwasher (eco mode)	2-3 gallons	0.8-1.0 kWh
Hand washing	15-25 gallons	2-4 kWh (hot water)

The dishwasher wins on both water and energy. The only scenario where hand washing makes sense is when you have just 2-3 items.

Tips to Reduce Running Costs

1. Run full loads only - A half-load uses the same water and energy as a full load
2. Use eco/energy mode - Takes longer but uses less water and energy
3. Skip heated dry - Open the door after the cycle and let dishes air dry
4. Run during off-peak hours - If your utility charges time-of-use rates
5. Use the right amount of detergent - More isn't better and wastes money
6. Maintain your dishwasher - A clean filter and spray arms improve efficiency

Understanding the EnergyGuide Label

Every dishwasher sold in the US comes with an EnergyGuide label showing:

• Estimated yearly energy cost - Based on national average electricity rates
• Estimated yearly energy consumption - In kWh
• Comparison range - How this model compares to similar models

The estimated cost is a good baseline but your actual cost depends on local electricity rates and usage patterns.

The Most Efficient Dishwashers

The most energy-efficient dishwashers share these traits:

• Condensation drying instead of heated drying
• Auto-sense wash cycles that adjust to soil level
• Efficient water circulation pumps
• Good insulation (which also reduces noise)
• Eco mode with extended cycle time

FAQ

Is it cheaper to run the dishwasher at night?

If your utility uses time-of-use pricing, yes. Off-peak rates (typically 9 PM to 7 AM) can be 30-50% cheaper. Use the delayed start feature to schedule runs.

Should I use eco mode every time?

Eco mode is ideal for normally soiled dishes. Use normal or heavy cycles only when needed for heavily soiled items. Eco mode typically adds 30-60 minutes to cycle time.

How much water does a dishwasher use per cycle?

Modern dishwashers use 3-5 gallons per cycle. Energy Star models use as little as 2.4 gallons. Countertop models use 1-3 gallons.