Question 1

How much electricity does a washing machine use?

Accepted Answer

A standard washing machine uses 0.5–2.5 kWh per load, depending on water temperature and age of the machine. A modern ENERGY STAR front-load washer uses about 0.5–0.9 kWh per load. Washing in cold water (vs hot) cuts washer energy use by 75–90% — 90% of the energy used for washing goes to heating the water. At $0.138/kWh, 8 loads per week costs $7–$35/year for the washer alone.

Question 2

Does a heat pump dryer save money?

Accepted Answer

Yes. A heat pump dryer uses 50–70% less electricity than a standard electric resistance dryer. Annual savings: $50–$120 for an average household (8 loads/week). At a premium of $300–$700 over a standard electric dryer, payback is 3–8 years. The federal home improvement tax credit covers ENERGY STAR heat pump dryers at 30% back. Heat pump dryers are also gentler on fabrics since they use lower temperatures.

Question 3

What is the most energy efficient washer and dryer?

Accepted Answer

The most energy-efficient washer is an ENERGY STAR certified front-load washer using cold water — look for the MEF (Modified Energy Factor) rating. The most energy-efficient dryer is a heat pump dryer such as the LG DLHC1455V or Samsung DV25BB6900H, which use 50–70% less energy than standard dryers. An efficient front-load washer plus heat pump dryer combination can cut laundry energy costs by 60–75% vs an older top-load washer and standard dryer.

Laundry Energy Cost Calculator