Washer and dryer done notification: 4 ways to set it up

Four ways to detect “done”

Method 1: Energy-monitoring plug on a washer

Many washers draw several hundred watts while running, with higher bursts at the start of a spin or when a heater runs. Check the nameplate on the washer or the manual. If it gives amps, multiply amps by 120 volts for watts, the same method the Department of Energy gives for estimating appliance power. A plug rated for 15 amps handles up to 1,800 watts. If your washer’s nameplate is near or above that, or the outlet is on a dedicated 20 A circuit, do not use the plug.

The plug then needs a rule: when power falls below a few watts for two to three minutes, send a notification. The delay handles pauses during soaking and between rinse stages. Set the threshold from your own cycle readings: run one load and watch the app’s power graph. A “done” rule that is too tight fires at every pause; too loose delays the alert. Use a plug with local control or a hub, so the alert does not depend on one company’s cloud. See smart plugs with energy monitoring for accuracy and limits.

Method 2: Vibration sensor, the universal option

A small multipurpose sensor stuck on the washer or dryer cabinet detects vibration. The rule: vibration for several minutes, then no vibration for three to five minutes means the cycle is finished. It works on gas and electric dryers, front-load and top-load washers, and needs no wiring. Mount it on a flat part of the cabinet where vibration is strongest, not on a lid that opens. Vibration from a neighboring machine can fool it, so test with both machines running.

Dryers: why you should not use a plug

Electric dryers use 240 V and a large plug, often 30 amps. The Department of Energy points out that plug-in usage monitors work for 120-volt devices and cannot measure clothes dryers, which use 240 volts. A 120 V smart plug does not fit a dryer outlet and must never be adapted to it. Gas dryers plug into 120 V, but many makers want them plugged directly into the wall; follow the manual, and use a vibration sensor instead. Dryer lint and venting are separate fire concerns; clean the lint screen each load and vent according to the dryer manual.

Method 3: The appliance’s own app

Connected washers and dryers from major makers send “cycle complete” notifications through their apps. They are simple and need no extra hardware, but they rely on the maker’s cloud, and the notification can be delayed. Some models also work with Alexa or Google Home. If you set one up, follow the FTC’s basics: change default passwords, enable two-factor authentication and keep firmware updated.

Method 4: Circuit monitor

A panel-mounted energy monitor with clamp sensors can watch the dryer circuit and the washer circuit and report their power. It is the way to monitor a 240 V dryer by power draw. Installing it means working inside the electrical panel; turn off power at the main breaker and hire a licensed electrician if you are unsure, and follow local code. For more on this option, see the whole-home energy monitor guide.

Make the notification useful

• Send it to the right person. A message to the whole household helps; a second reminder after 20 minutes catches forgotten loads.
• Add a leak sensor behind the washer. A leak is a bigger problem than a damp load; EPA data say household leaks waste more than 9,300 gallons a year on average. See the leak protection kit.
• Estimate cost. A washer cycle uses little power. ENERGY STAR notes that water heating accounts for about 90 percent of the energy it takes to operate a clothes washer. Use the device energy cost calculator for the rest.