How to Keep Bath Water Warm


Created At 10 months ago

Keeping bath water warm can be challenging, especially if you like long baths. There are several ways to keep bath water warm, including using a bath pillow, adding insulation to the tub, using a bath heater, and adding hot water. In this guide, we will discuss these methods in more detail and provide step-by-step instructions on how to keep bath water warm for an extended time. Whether you're looking for a simple solution or a more advanced option, there is a method that will work for you. With the right approach and a little planning, you can enjoy a warm, relaxing bath whenever you want.

Guidelines on How to Keep the Water in the Bathtub Warm

warm bathtub

Pick the Right Bathtub Material:

The material of your bathtub is crucial in maintaining warm water. Certain materials are better insulators than others, which means they can retain heat for longer. Acrylic tubs that are properly insulated can retain heat effectively. They come in various sizes, styles, and colors and are lightweight, durable, and resistant to cracking and chipping. If you have difficulty keeping your bathwater warm, consider replacing your bathtub. A new tub upgrade can improve your bathing experience and increase your home value. It also offers a great return on investment compared to other home improvement projects.


Similar to the material of your bathtub, the insulation in your bathtub is also important. A bathroom's insulation can be measured by the space between the tub and the wall. A typical shower enclosure, with three adjacent walls, will effectively trap moisture and warmth for your bath. Insulation is not a major concern for most people as their bathroom is already set up to trap heat. However, if you have a freestanding bathtub, insulation will be poor as the bathtub will be most exposed to the outside weather. In this case, you need to rely on the material of your bathtub to retain heat or install your bathtub near a wall surround to trap surrounding heat and steam, prolonging the time before your water cools down.

Start with Hot Water: 

One way to keep bath water warm is to fill the tub with water that is hotter than your desired temperature. Preheating the bathtub is similar to preheating an oven to achieve a good sear on meat; it permits the tub material to absorb heat from the water before you enter the tub. When you take a bath in a chilly tub without preheating it, the surface of the water will collect heat from your body and cool the water down too quickly.

Use a Quality Bubble Bath: 

Bubble baths are not just for fun; they are functional in keeping bath water warm. While preheating your tub helps retain heat, your bath also loses heat from the water's surface. Bubble baths are a barrier on the water's surface, preventing heat transfer from your hot bath into the cooler air outside the tub. The more bubbles in your bath, the longer the water will retain its heat.

Close the Bathroom Door: 

While most people like privacy when bathing, parents of young children may need to keep the bathroom door open for monitoring. Still, closing the bathroom door while soaking in the tub is a simple approach to extend the time that the water stays comfortably warm. When you close the bathroom door, the steam from the shower or bath will stay inside and help to heat the room. This prevents heat transfer while bathing, as the air in contact with the water's surface isn't cold and will not draw as much heat out of the bath water.

Use Hot Stones: 

Hot stones can enhance your bath's luxurious experience while keeping the water warm for longer. Stones used for baths are often made of basalt, a volcanic stone known for its ability to retain heat at high temperatures. Preheating hot stones and adding them to your bath will slowly release heat into the water as you bathe, keeping the water warm for the duration of your bath.

Bubble Baths: 

In addition to being a fun activity, bubble baths also help keep your water temperature insulated due to the foam from the bubbles. If there is enough bubble foam on the surface of the water, the temperature of the bath will stay higher for a longer period of time. The foam also aids in keeping the tub cleaner in the long run by preventing residue and deposits from sinking to the bottom.

Bath Covers: 

Popular in Japan, bath covers provide a heat trap for one side of your bathtub while you soak. This reduces the surface area for heat to escape, keeping your water warmer for longer without the need for additional elements such as hot stones or bubble foam. These covers are available in various materials, mostly wood, but some ivory variants are also available. Simply place them over your bathtub, and you'll notice an immediate difference in temperature.

Closing the Bathroom Door: 

A simple tip everyone can follow is keeping the bathroom door closed not only offers privacy but also helps keep the bathroom from losing any built-up heat. An open door can easily let in cold air, so keeping it closed while taking a bath is important to ensure proper heat retention. Steam is a great heat disperser, meaning the more steam builds up in your bathroom, the warmer the air will be.

Get a Space Heater: 

To combat a cold bathroom, a space heater is a quick solution. However, using electrical appliances near a water source is not recommended. Thus, only consider using the space heater to heat the bathroom before filling the tub. When the room is at the desired temperature, turn off the space heater and place it out of the way of the bath. The bath water is more likely to retain heat for longer by heating the room before bathing.

Consider a Tankless Water Heater: 

If your current water heater doesn't have enough hot water capacity to fill your tub, consider switching to a tankless water heater. It heats water on demand, providing unlimited hot water to fill your bathtub. Additionally, tankless water heaters are energy-efficient as they only heat water as needed. This is the best option for larger bathtubs and those who use hot water.


Keeping bath water warm can be challenging, but there are several ways to achieve this, such as using a bath pillow, adding insulation to the tub, using a bath heater, and adding hot water. Using one or a combination of these methods, you can enjoy a warm, relaxing bath for an extended period.


Frequently Asked Questions (FAQs)

Answer: The amount of time it takes for bath water to cool down depends on the temperature of the water and the room, as well as the tub size. On average, bath water will cool down within 20-30 minutes.

Answer: The best way to warm bath water will depend on your preferences and budget. Some popular options include using a bath pillow, adding insulation to the tub, using a bath heater, and adding hot water.

Answer: Yes, you can use a heating pad to keep bath water warm, but it is not recommended as it can be dangerous if left unattended or if the heating pad is not waterproof.

Answer: To prevent your bath water from getting too hot, use a thermometer or test the water with your hand before getting in. You can also use a cooler water faucet for mixing and add cold water to the bath to reach a comfortable temperature. By following these methods and tips, you can enjoy a warm, relaxing bath for an extended period. Always test the water temperature before getting in, and add more hot water as needed.

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