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6 Ways to Keep Your Bath Water Warm for Longer

Starting your bath with warm water only to shiver as it cools can ruin the experience.

After all, the key to a pleasant bath is maintaining the perfect warmth.

Ideally, a good soak should last between 15 to 20 minutes, but it’s frustrating when the water turns cold within just a few minutes.

Discover the secrets to keeping your bath water warm for longer with these six effective methods.

bathtub filled with water

Why Isn’t Your Bath Water Warm Enough?

Generally, you want to soak in bathwater that’s between 90 to 105 degrees.

There are several reasons why bathwater can’t seem to get warm enough:

  • Your bathtub could have poor insulation. Insufficient insulation can cause the bathwater to lose heat more quickly.

  • Inadequate insulation of your bathroom walls. When it’s too cold outside, like during winter, that could lead to a chilly bathroom, ultimately affecting the water temperature in the bathtub.

  • Your water heater could be a bit too small. You need to pick a heater depending on the size of your bathtub or the amount of hot water you need.

    An insufficient water heater will always be running out of hot water to fill your tub.

  • Your bathroom could just be chilly. Common hard surfaces in bathrooms like ceramic, glass, and metal take the heat out of the air, and it’s up to the hot bath water to try to warm the room.
    Thus, your bath water loses heat much faster.

How to Keep Your Bath Water Warm for Longer

Now that you know what causes bathtub water to not stay warm long enough, it’s time to list the solutions – the best ways to keep your bathwater warm.

1. Keep the Bathroom Door Closed

There was this old saying that goes, “never leave the door open while taking a bath,” and in this case, it’s absolutely right.

It is not only an issue of privacy but of keeping the bath water warmer for longer periods of time.

You want the steam coming out of your bath water to be contained in the bathroom, warming the space in the process.

Closing the bathroom door will keep the warm air from escaping.

If your bathtub comes with a shower curtain, consider closing that as well.

2. Preheat the Bath to a Higher Temperature

Water loses heat, and it’s just the way things are, especially while filling the tub.

Your bathtub has a cold surface, and as you fill it, the tub will absorb some of the heat from the bathwater.

That’s one of the reasons why your once warm water has turned less warm as you get in.

The quickest way to deal with this problem is to preheat the cold tub.

Instead of filling up the tub with your desired “warm” temperature, run the water hotter than you normally would.

If it’s too hot for your liking afterward, you can simply adjust it by adding cold water to get the water temperature you prefer.

After all, it’s easier to make the bathwater colder than it is to make it hotter.

3. Add a Couple of Hot Stones

Heat-retaining stones are usually made of volcanic rocks called basalt that you can add to the tub, and they can extend your warm relaxing bath.

Heat them up to a comfortable temperature and place them in your bathtub, and they will keep your bathtub’s water warm for the entirety of your bath.

You might need a couple of hot stones, depending on how large your tub is.

4. Use a Space Heater

Another trick to keep your bathwater warm is to get a space heater.

It’s not going to heat the bathwater directly, but indirectly it will warm up the bathroom itself.

This tip is especially useful if you have an especially cold bathroom or if your tub has poor insulation.

This way, there is no cool air taking heat from the bathwater, allowing it to stay warm for much longer.

But always be careful when using electrical appliances in the bathroom, especially near the tub.

As a safety rule, consider running the space heater before filling the tub.

Once the bathroom is warm enough, unplug the heater, and you can then fill the tub and enjoy a nice, hot bath.

A warmer room will allow the bathwater to retain heat for longer.

5. Switch to a Tankless Water Heater

If your existing water heater doesn’t have enough hot water capacity to fill the tub, switch to a tankless water heater.

It heats up water on demand, giving you unlimited hot water to fill your bathtub.

Not to mention, tankless water heaters are energy-efficient since it only heats water as you need it.

It’s the best option for larger bathtubs and if you use a lot of hot water.

6. Take Bubble Baths

Besides warm baths, bubble baths are one of the most enjoyable and luxurious bath experiences you can have at home.

If you love both, there’s no reason why you couldn’t do both at the same time.

In fact, bubbles can even retain the warmth of your bath water for much longer.

Bubbles act as a barrier on the surface of the water, preserving the water temperature and keeping the cooler air of the bathroom from replacing the steam.

Best Bathtub Material for Keeping Bath Water Warm

Not all bathtubs are created equal.

They come in various shapes and sizes and are made from different materials.

The material of the tub is crucial in determining how effectively it retains heat and keeps the bathwater warm.

Common materials used for bathtubs include acrylic, copper, cast iron, and stone resin.

The best bathtub material for keeping bath water warm is cast iron.

Cast iron has excellent heat retention properties, allowing the water in the tub to stay warm for a longer period of time.

This is due to the thick enamel coating on cast iron tubs, which helps to maintain the temperature of the water for extended soaks.

Additionally, cast iron tubs are highly durable and resistant to cracking, scratching, and chipping, ensuring a long-lasting and enjoyable bathing experience.

Additional Tips for Keeping Your Bathroom Warmer

Keeping the chill from your bathroom goes a long way in keeping the bathwater warm so you can enjoy your bath longer.

If you have an especially chilly bathroom, these tips will help you out.

  • Besides the doors, close the windows, curtains, and blinds while you take a warm bath, so the chilly air stays out.

  • If you have a cold bathroom floor, consider covering it with fluffy bath mats.

Mandy Phillips

As a frequent contributor to top US magazines and publications in the home improvement niche, Mandy has been known for sharing her expertise on how to clean, organize, and decorate bathrooms.

Additionally, Mandy has immense experience offering lifestyle tips and tricks to her readers.

About Loo Academy

At Loo Academy, our mission is to offer trusted advice for everything related to bathrooms (design ideas, plumbing advice, showering & bathing tips, remodeling guides, and more) — a place where we all spend a great deal of time.

We work closely with qualified experts and follow a thorough editing and fact-checking process before publishing content.

Published content is regularly fact-checked and revised so that the information we provide is accurate and up-to-date.

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