How to Store a Cordless Pressure Washer Before a Freeze

To store a cordless pressure washer before a freeze, clear the water out of its water path, keep the washer indoors where it can't freeze, and care for the battery the way its own instructions say. Running on a battery does not protect a washer from frost. Water left in the pump, hose, or gun can still freeze.

The steps below come from our guidance for Fanttik NB-series washers. If you own another model, use the same three goals, but follow that washer's own manual for the exact steps.

How to Remove Water From the Washer Before a Freeze

On our NB-series washers, the water path takes three short steps to clear. Our guidance warns that standing water can freeze in cold climates and crack components. It also leaves residue behind. So these steps matter most right before the first hard frost.

For Fanttik NB-series washers, do this in order:

1. Clear the pump lines. Take the inlet out of the water, then run the pump for a few seconds. With no water coming in, the pump pushes out what is left in the lines. Stop once the run is done. A few seconds is all the guidance calls for.
2. Empty the hose and gun. After the pump run, drain whatever water is still in the hose and spray gun. Hold them so the water can run out, and check that nothing is still dripping before you coil the hose.
3. Rinse and dry the inlet filter. Grit on the filter screen cuts down flow and can starve the pump of water. Rinse the screen clean, then let it dry fully before you put the washer away.

These steps cover the pump lines, hose, gun, and inlet filter on NB-series units. Our guidance actually says to drain after every use, so a pre-freeze drain is really just that routine done carefully one last time. You can follow it without special tools or extra fluids.

Other washers may be built differently. They might have more fittings, a different inlet design, or attachments that hold water in places these steps don't reach. On those models, don't borrow a generic flush, antifreeze, or pump-saver routine made for a different machine. Use the drain steps in your washer's manual, and treat any attachment not named above as covered by its own instructions.

Where to Store the Washer During Freezing Weather

For NB-series washers, our guidance is simple: store the washer indoors, out of frost and direct sun. If you have a foldable model, fold it flat to save shelf space. The NB8 Ultra manual says the same thing in stronger words: store it indoors, and never store it outdoors or anywhere it could freeze.

Neither document gives a minimum storage temperature in °F. So pick a spot by asking one question: can this space freeze? An unheated shed or a garage that drops below freezing on cold nights fails that test, even if it stays dry. A space that stays above freezing all winter and is out of sunlight from a window passes.

Being cordless doesn't change any of this. The battery only replaces the power cord. The pump, hose, and gun still carry water, and that's the part frost can damage. If you own a different washer, look for the storage line in its own manual. Then choose a space that meets it instead of assuming the NB-series rule carries over.

Store the Battery According to Its Instructions

Battery care is its own task, separate from draining water. Every NB-series washer uses a built-in rechargeable battery, and the NB10 Fold charges over USB Type-C. Our guidance says to charge it before storing. Don't leave the unit sitting for long periods on a dead battery.

Since the battery is built in, you store it together with the washer in the same indoor, frost-free spot. Our guidance doesn't give a target charge percentage or a battery temperature range. So the practical step is to charge it before the washer goes on the shelf for winter. That way it won't sit drained for months.

Washers with removable battery packs work differently. That pack has its own instructions for charge level and where to keep it, and those come first. If you're choosing between rooms for a removable pack, our guide on where to store washer batteries compares basement and garage storage. Our guide to garage storage for lithium-ion gear covers more battery-powered gear you might keep in the same space.

FAQs

What if my washer already sat in freezing temperatures?

Before you use it again, check the parts that hold water, including the hose, gun, and fittings, for cracks or leaks. Our NB8 Ultra manual says to check before each use that the components are in good condition and to look for broken or worn parts. If you find a cracked or damaged part, don't run the washer until that part has been dealt with. If you're not sure how, contact our support team.

Can I use my cordless washer to clean the car in winter?

Yes, but the freeze risk shows up as soon as you stop spraying. Take the washer back indoors after the job and drain it like you normally would. If pressure drops while you're working in the cold, our guide to cold-season pressure loss fixes walks through troubleshooting.

Should I add antifreeze to a cordless pressure washer?

For NB-series washers, no. Our guidance doesn't include an antifreeze or pump-saver step. It relies on draining the water and storing the washer somewhere frost-free. For other models, only add antifreeze if that washer's own manual tells you to.

Do I need to drain the washer only before winter?

No. Our NB-series guidance says to drain after every use. That's because standing water leaves residue in any season. Making it a habit means the washer is already close to ready when the first freeze comes.