How to Wash a Heated Blanket Safely: Step-by-Step Guide

Reading Time: 12 minutes

Your heated blanket has been keeping you warm through another Ontario winter. And now it smells like it. Body oils, sweat, pet hair, that mystery stain from last Tuesday. It needs a wash.

But the idea of putting something with electrical wires into a washing machine feels wrong. Like putting a toaster in a bathtub. Understandable concern.

Here is the good news: most modern heated blankets are designed to be washed. The internal wiring is sealed and insulated, built to handle gentle washing cycles. The key word is gentle. Treat your heated blanket like a delicate piece of technology wrapped in fabric (because that is exactly what it is), and it will come out clean, safe, and ready for another season.

This guide walks you through every step. Machine washing, hand washing, drying, spot cleaning, and the mistakes that can turn a perfectly good blanket into an expensive fire hazard.

Can You Actually Machine Wash a Heated Blanket?

Yes, most heated blankets manufactured after 2005 are machine washable. The wiring inside modern heated blankets is thin, flexible, and encased in waterproof insulation specifically designed to withstand gentle agitation and water exposure.

That said, "most" is not "all." Some older models, particularly those with thicker, less flexible heating elements, may be spot-clean only. The care label is your definitive answer.

Which Heated Blankets Are Machine Washable?

If you cannot find a care label or the blanket is older than 10 years, the safest approach is hand washing or spot cleaning only.

8 min read

Before You Wash: Essential Prep Steps

Rushing straight to the washing machine is the most common mistake people make. Five minutes of preparation protects both the blanket and your washer.

Machine Washing a Heated Blanket: Step by Step

Machine washing is the easiest method for most modern heated blankets. The key is using the gentlest settings your machine offers and keeping the wash cycle brief.

Quick-Reference Machine Wash Settings

Hand Washing a Heated Blanket

Hand washing is the gentlest option and the best choice for older blankets, blankets without a machine-washable label, or anyone who wants to play it extra safe. It takes more effort, but gives you complete control over how the blanket is handled.

How to Dry a Heated Blanket Safely

Drying is where most people make mistakes. The temptation to throw it in the dryer on high heat is strong, especially in winter when you want your blanket back fast. Resist.

Air Drying (Recommended)

Air drying is the safest method for any heated blanket. Here is how to do it properly:

1. Lay flat on a clean, dry surface. A drying rack, clean outdoor table, or a few towels on the floor work well. Spread the blanket out fully with no folds or bunching.
2. Or drape over a clothesline or shower rod. Drape the blanket evenly so the weight is distributed. Reposition every few hours so one section does not stretch from bearing all the water weight.
3. Allow 12-24 hours for complete drying. The blanket must be 100% dry before plugging it back in. Any residual moisture near the electrical connections is a safety hazard.
4. Feel the connection point. Before reconnecting the controller, feel around the power cord connection area. It should be completely dry to the touch, with no dampness or coolness that would suggest trapped moisture.

Tumble Drying (Limited)

Some manufacturers allow brief tumble drying. If your care label permits it:

• Use the lowest heat setting or air-fluff/no-heat setting
• Dry for 10-15 minutes maximum
• Remove immediately and finish air drying flat
• Never use medium or high heat
• Never run a full dryer cycle

Drying Methods Compared

Spot Cleaning for Small Stains

Not every stain requires a full wash. For small spills, food marks, or pet accidents, spot cleaning is faster and puts less stress on the blanket's wiring.

How to Spot Clean

1. Unplug the blanket and disconnect the controller. Always.
2. Blot the stain with a clean cloth or paper towel. Press gently. Do not rub, as rubbing pushes the stain deeper into the fabric fibres.
3. Mix a cleaning solution of a few drops of mild dish soap in cool water.
4. Dab the solution onto the stain with a clean cloth. Work from the outside of the stain inward to prevent spreading.
5. Rinse by dabbing with a clean, damp cloth. Repeat until all soap residue is removed.
6. Blot dry with a dry towel, then let the area air dry completely before plugging the blanket back in.

For tougher stains like blood, coffee, or wine, use a small amount of hydrogen peroxide (3%) on white or light-coloured blankets. Test on a hidden area first. For dark-coloured blankets, stick with the mild soap method to avoid discolouration.

How Often Should You Wash Your Heated Blanket?

The answer depends on how you use it. A heated blanket used as a mattress pad underneath your bedding needs less frequent washing than one you wrap around yourself directly.

The general rule: wash your heated blanket as infrequently as you reasonably can while keeping it hygienic. Every wash cycle, no matter how gentle, puts some mechanical stress on the internal wiring. Fewer washes means a longer blanket lifespan.

Common Mistakes That Damage Heated Blankets

These are the errors we see most often. Each one can shorten your blanket's life or create a genuine safety hazard.

1. Using Hot Water

Hot water (above 50 degrees Celsius) degrades the polymer insulation around heating wires. It also causes some blanket shell fabrics, particularly polyester blends, to shrink, which puts compression stress on the internal wiring. Always use cool to warm water.

2. Wringing or Twisting

When you wring out a heated blanket, you are forcing thin heating wires to bend at extreme angles. This can crack the insulation or snap the wire entirely. The break may not be visible from the outside, creating a hidden fire risk. Let the water drain naturally.

3. Dry Cleaning

Dry cleaning chemicals (perchloroethylene and other solvents) dissolve the polymer insulation around heating wires. Never dry clean a heated blanket. The solvents attack the very materials that keep the electrical components safely contained.

4. Using Bleach

Chlorine bleach is corrosive to both the heating wire insulation and the fabric itself. Even colour-safe oxygen bleach can be too harsh for the sensitive internal components. Stick with mild liquid detergent only.

5. High-Speed Spin Cycles

A high-speed spin cycle generates centrifugal force that stretches and pulls the fabric outward. The heating wires, which are sewn or bonded at fixed points, cannot stretch with the fabric. This can pull wires loose from their connection points or create stress fractures in the wire.

6. Leaving It Bunched in the Dryer

If you do use a dryer briefly, never leave the blanket sitting in a hot drum after the cycle ends. The retained heat and the blanket's own weight pressing on the wiring in a bunched position can cause permanent kinks.

7. Folding During Storage

This is not a washing mistake, but it is closely related. Folding a heated blanket creates creases that press against the heating wires. Over time, these creases can damage the wiring. Roll the blanket loosely or drape it flat during storage.

8. Ironing

Never iron a heated blanket. The concentrated heat from an iron will melt the wire insulation almost instantly. If your blanket is wrinkled after washing, let it hang or lie flat. The wrinkles will relax on their own.

Safety Inspection Guide

Fire safety data shows that electric blankets cause approximately 500 residential fires annually, with nearly all involving blankets more than 10 years old. A quick inspection before and after each washing reduces your risk significantly. Electric blankets with automatic shut-off features reduce fire risk by an estimated 80%.

Before Each Use (30-Second Check)

1. Run your hands across the entire surface feeling for lumps, kinks, or bunched wire
2. Check the power cord connection point for fraying or damage
3. Inspect the controller for cracks, discolouration, or a burning smell
4. Verify the blanket heats evenly across its full surface

After Each Wash (Thorough Inspection)

1. While the blanket is still flat and damp, feel the entire surface methodically
2. Check that the heating wires are still evenly spaced (you can usually feel them through the fabric)
3. Inspect the connection plug area for water damage or corrosion
4. Once fully dry, plug in on the lowest setting and check that it heats evenly
5. Monitor it for 30 minutes on first use after washing

Annual Deep Inspection

1. Check the blanket's age. If it is over 10 years old, consider replacing it regardless of condition.
2. Test all heat settings from lowest to highest
3. Verify the auto-shutoff feature works (most modern blankets turn off after 10 hours)
4. Check the entire length of the power cord for damage

Storing Your Heated Blanket in the Off-Season

How you store your heated blanket during the warmer months affects its condition and longevity. Ontario's humid summers can be particularly rough on stored textiles.

Proper Storage Steps

1. Wash before storing. Never put away a dirty heated blanket. Body oils and sweat attract insects and cause odours during storage.
2. Ensure it is 100% dry. Any moisture trapped in storage will cause mould and mildew, and potentially corrode the electrical components.
3. Roll, do not fold. Loosely roll the blanket to avoid creating permanent creases over the heating wires. Alternatively, drape it over a hanger in a closet.
4. Store the controller separately. Place the controller and power cord in a labelled bag near the blanket, but not wrapped inside it. This prevents the hard controller edges from pressing against the blanket fabric and wiring.
5. Use a breathable storage bag. A cotton or muslin storage bag is ideal. Avoid sealed plastic bags or vacuum storage bags, as these trap moisture and prevent air circulation.
6. Store flat or loosely rolled. Do not put heavy items on top of the stored blanket. Weight pressing on the wiring for months can cause permanent damage.
7. Choose a cool, dry location. A bedroom closet shelf is better than a basement or attic, where temperature and humidity fluctuations are greater.

Care by Blanket Material

Heated blankets come in various shell fabrics. Each has slightly different care needs.

For more on pilling and how to prevent it, we have a separate guide on that topic.

Heated Blanket vs. Heated Mattress Pad: Care Differences

Some people use heated mattress pads rather than heated blankets. The washing process is similar, but there are a few differences worth noting.

Eco-Friendly Blanket Care Tips

Every laundry cycle uses water, energy, and detergent. Here are ways to reduce the environmental footprint of heated blanket care:

• Wash less often. Use a removable cover to reduce the need for full washes.
• Cold water only. Cold water cleans effectively for body oils and odours, and uses less energy than warm water.
• Air dry always. Skipping the dryer entirely saves energy and is better for the blanket.
• Use eco-friendly detergent. Plant-based, biodegradable detergents clean gently without harsh chemicals.
• Full lifespan use. Proper washing and storage extends a heated blanket's useful life from 3 years to 10 years, reducing waste.
• Responsible disposal. When a heated blanket reaches end of life, remove the controller and cord for electronic recycling. The fabric portion can often go to textile recycling.