Water-Heated Bed Pad: Change Water and Reuse After Storage

If your water-heated mat has been stored for a long time, check the hoses and connections first. Handle any remaining water according to the drainage instructions for your model. After filling it with fresh water, check for leaks and errors. Topping up when the water is low is different from replacing all the water.

The drainage guidance is based on the Steamboy FAQ dated August 21, 2026, and the user manuals for individual models.

Supplies and Official Manuals to Prepare Before Starting

First, find the manual using the model name on the product label. Drainage methods may differ even within the same brand. Steamboy provides manuals for individual models through customer support on its official store website.

• The full model name on the product label
• The user manual for that model
• A container to catch the drained water and a towel to wipe up moisture
• The drainage connector or air pump specified in the manual
• Fresh water of a type allowed by the manual

Water-heated mats circulate heated water inside the mat. This means you need to maintain both the boiler tank and the inside of the mat. Emptying only the boiler does not drain the entire system.

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After long storage, refill and check for leaks before resuming use.

Comparing Topping Up, Full Water Replacement, and Draining Before Storage

Choose the right water maintenance task based on the current condition and when you plan to use the product next. Topping up means adding the amount that is missing. Full replacement means draining the existing water and replacing it with fresh water. Draining before storage prepares the product for a period without use.

Steamboy's water maintenance FAQ gives the following guidance.

There is no fixed schedule for regularly replacing all the water.

Steamboy FAQ, “When should I top up or drain the water in a water-heated mat?”

Do not apply this statement directly to products from other manufacturers. The replacement guidance for your model takes priority. If no interval is given, contact customer support with the model name.

Checking Water Types and Replacement Timing

Check your model's manual to find out what water to use. The Steamboy FAQ allows bottled drinking water, tap water, and filtered water. It advises against using seawater, groundwater, or saline solution. Additives such as cleaning agents or fragrances must not be used either.

Do not decide how often to replace the water in your water-heated mat based on an individual's Q&A response. First, check whether the manual specifies a replacement interval. Read the filter replacement guidance separately as well. Do not interpret the filter's service life as the water replacement interval.

1. Check the manual for the types of water you can use.
2. Look for a specified interval for replacing all the water.
3. If there is a filter, check the filter maintenance section too.
4. If foreign matter keeps appearing, ask the manufacturer how to inspect the product.

Do not add citric acid or detergent for cleaning on your own. Check whether the manufacturer allows the method you plan to use for internal cleaning. If a problem remains after replacing the water, have the product checked before restarting it.

Steps for Draining a Water-Heated Mat

Stop heating and let the water inside cool sufficiently before draining. Disconnecting a hose while the water is hot can cause burns. Manual and automatic drainage require different power settings.

Manual Drainage

Carry out manual drainage with the product unplugged. The instructions below are for Steamboy products that use an air pump. If your product has a different design, follow its model-specific manual.

1. Turn off the power and unplug the product.
2. Let the water in the boiler and mat cool sufficiently.
3. Place a container to catch the water, then disconnect the hose from the boiler.
4. Remove the boiler's water cap and filter as instructed in the manual.
5. Tilt or turn the main unit upside down in the specified direction to drain it.
6. Lay the mat flat and connect the specified drainage tool.
7. For models that use an air pump, pump air into the indicated opening.
8. Catch the water coming out of the other side in a container.

If the water does not drain easily, do not force it. Stop if you see damage to a connection. Ask the manufacturer's customer support about the drainage tool and the condition of the connections.

Automatic Drainage

For automatic drainage, follow the button instructions and connection sequence for your model. Some products need to remain connected to power to run this function. Applying the manual drainage procedure as-is may prevent it from working.

1. Stop heating and let the water inside cool sufficiently.
2. Prepare the dedicated drainage parts for the correct size.
3. Check the required power state and connection sequence in the manual.
4. Run the drainage function as instructed.
5. Once it finishes, handle any remaining water according to the manual.

The Difference Between Turning Off the Power Button and Unplugging

Turning off the power button is not the same as unplugging the product. On the Steamboy S8000 S, the drain button is used while the power is turned off. The instructions say to unplug the power cord when removing residual water from the boiler. Even on the same product, the required power state changes depending on the step.

Before starting, mark the power-related instructions in the manual separately. The wording in the general FAQ may differ from the model's manual. If the order in which to apply the instructions is unclear, check with the manufacturer before proceeding.

Steps for Reuse After Long-Term Storage

When reusing the product, inspect its exterior before adding water. Steamboy's storage FAQ advises checking the hoses and connectors for damage. After adding water, check for leaks too.

1. Check the hoses and connectors for damage before connecting the power.
2. Check that the power cord and plug are free of damage and moisture.
3. Follow the model's drainage instructions to handle any remaining water.
4. Spread out the mat and arrange the hoses so they are not kinked.
5. Connect the boiler and mat as instructed in the manual.
6. Operate the power controls in the sequence specified in the installation guide.
7. Slowly add an allowed type of water and stop at the specified water level.
8. Close the water cap and check for leaks at the connections and beneath the mat.
9. Check whether the low-water signal and errors clear.

Top up the water in your water-heated mat according to the signals specified for the model. The Steamboy FAQ advises against adding water just because the water-level indicator lights have decreased. This guidance concerns products that give both a low-water indication and an audible warning. If the signals continue after you have added enough water, stop adding more.

Examples of Different Fill Volumes for the Same Queen Size

Even when the size is the same, the amount of water needed varies by model. The figures below are from the respective user manuals. They are not universal fill volumes to apply to other models.

If water is already left inside, do not add the full amount shown in the table. The total fill volume is different from the amount currently needed for topping up. When adding water, follow your model's water-level guidance and stop-filling signals.

Checks Before Storing a Water-Heated Mat

Before long-term storage, drain the boiler and mat and let them dry thoroughly. Steamboy advises leaving no water or moisture behind. Whether to fold or roll the mat depends on its type.

Do not apply these categories directly to products from other manufacturers. Check the storage instructions for your mat. Washing the cover and draining the inside are also separate maintenance tasks. Check the separate care label to see whether washing is allowed.

When to Stop Restarting the Product and Have It Checked

If there are leaks or recurring errors, stop using the product and contact the manufacturer. Do not assume it is operating normally just because you have replaced the water. On Steamboy's official store website, customer support links to product inquiries and after-sales service requests.

When making an inquiry, provide both the model name and the displayed error. Noting where the leak occurs and the circumstances also helps with the assessment. Even after normal operation resumes, follow the manual's precautions against low-temperature burns. Water maintenance alone cannot prevent burns from prolonged contact.