Warm Water Bidets – 2 Water Heating Methods Used By Bidets

On a chilly morning, sitting down to use a bidet that only offers cold wash water can be quite a rude awakening! And it’s not just uncomfortable – getting hit with a stream of cold water can make you clench, so the water has a harder time getting you thoroughly clean.

Warm water bidets offer a better experience all around. Using a warm water wash is certainly pleasant, and since the warmth helps relax your nether regions, you’ll leave the bathroom confident that you’ve achieved a complete clean.

But what do the different heating options mean, and which one is right for you? Let’s dive into the two main types of water heating methods used by electric bidets.

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Warm Water Bidets with Instant Water Heaters

Warm Water Bidets with Tank Water Heaters

Other Types of Warm Water Bidets

Warm Water Bidets with Instant Water Heaters

Instant water heaters are the most popular option for warm water bidets – and for good reason! They’re a must if you’re looking for unlimited warm water for your wash. Unlike bidets with tank water heaters, there’s no rush to avoid running out of warm water. You’ll get a relaxing, complete clean no matter how long it takes.

Bidets that use this water heating method also tend to be more comfortable than any others on the market. Their compact design allows for plenty of sittable space, so even larger users won’t feel crowded.

Ultra-NOVA Bidet Seat
Ultra-NOVA Bidet Seat

If you crave comfort and style in your space, instant water heater bidets cover all the bases. With no need to make room for chunky tanks, their streamlined silhouettes blend seamlessly into any bathroom. One of our most popular bidet seats, the Ultra-NOVA, measures just 3.66 inches at its tallest point. At first glance, you might mistake it for a regular toilet seat – until you see what it can do!

So…do bidets with instant water heaters mean perfection? Close! But they do have a couple of downsides.

All these perks come at a higher price tag than bidets with tank water heaters. But while bidets that include instant water heaters are more expensive, they are still our most frequently purchased bidet style due to their benefits and high-end features.

Some bidets that use instant water heaters have a small burst of cold water before the water gets warm. This cold spurt comes from the water that remains in the line between the heater and the nozzle after each use. This burst tends to last only 0.25 to 0.5 seconds – short enough that most users won’t even notice it – but it might be annoying or unpleasant if you’re super sensitive to temperature fluctuations.

Positives of Warm Water Bidets with Instant Water Heaters Downsides of Warm Water Bidets with Instant Water Heaters
Unlimited warm water Most expensive bidets on the market
Comfortable experience with larger sittable area May spray a short burst of cold water at the start of the wash
Sleek, low-profile design
Do not draw power when not in use

Check out our recommended bidet seats with instant water heaters:

Warm Water Bidets with Tank Water Heaters

Tank water heaters are the least expensive option, making them a perfect fit for entry-level bidets. This type of heating system maintains a tank of warm water in the back of the bidet at all times. When you use the bidet and the tank empties, a heating coil warms more water to replenish the tank.

Despite their low cost, bidets with tank water heaters have a few advantages. First, the warm water tank provides immediate hot water. This means you won’t be unpleasantly surprised with a burst of cold water when you first activate the spray. Second, as long as there is enough warm water in the tank, the water temperature tends to stay very consistent.

As the wash runs, the tank heater’s heating coil warms the water flowing in from your home’s water line. Unfortunately, the coil in most tank water heaters isn’t very powerful and can’t keep pace with the amount of cool water flowing into the tank. This means that tank heaters usually only offer around 30 to 60 seconds of warm water before the line starts to go cold.

Once the wash water goes cold, it takes most tank heaters between three and five minutes to completely refill and reheat. If you deal with messy bowel movements or just need a little longer to feel completely clean, this setup may be a deal-breaker.

It’s similar to luxuriating in the shower until your water heater runs out of hot water: It starts out feeling great, but the water gradually cools down until you’re only being washed with cold water. Once the wash water goes cold, it takes most tank heaters between three and five minutes to completely refill and reheat. If you deal with messy bowel movements or just need a little longer to feel completely clean, this setup may be a deal-breaker.

But it’s not all bad news! Some tank heating systems have strong coils that can warm water faster than average. You may see manufacturers refer to these as “hybrid water heaters.” A few of these bidets even offer unlimited warm water!

Bio Bidet BB-1000 Supreme Bidet Seat
Bio Bidet BB-1000 Supreme Bidet Seat with Tank Water Heater

Tank water heaters also impact the comfort and style of your bathroom experience. The back of the bidet’s seat sits higher to accommodate the water tank. You’ll have to sit farther forward, which means the seat will feel smaller – and you might feel a bit cramped. Plus, water tanks add visual bulk, so they don’t look as sleek as bidets with instant heating options.

Lastly, tank water heaters keep the water hot 24 hours a day, 7 days a week. This means that they require more electricity to run than their more expensive counterparts, impacting their cost effectiveness over time.

Upsides of Warm Water Bidets with Tank Water Heaters Negatives of Bidets with Tank Water Heaters
Low initial cost Limited warm water that starts to cool after 30-60 seconds on average
Warm water from the very first moment Large back, making seated experience less comfortable
Consistent water temperature Uses electricity while not in use to keep water tank filled with warm water

Browse our most popular bidet seats with tank water heaters:

Other Types of Warm Water Bidets

Go Bidet Attachment

So far, we’ve been talking about the heating methods electric bidets use to create warm wash water. But that’s not the only option out there. Some non-electric bidets also offer warm water. However, there are a few key differences to know about between electric and non-electric warm water bidets.

All electric bidets have to be plugged into a GFCI outlet, but non-electric bidets run on your home’s water pressure. This means they’re ultra-eco-friendly and can function even if your power goes out. Non-electric bidets are also incredibly inexpensive (though our staff agree that the higher price tag of electric bidets is worth the extra comfort, durability and convenience they provide).

That said, there are some clear downsides to consider as well:

First, non-electric warm water bidets connect to the cold water line behind your toilet and to the warm water line under your sink. This alone can be a deal-breaker for many people. For example, you might have to keep a vanity door slightly ajar to accommodate the warm water hose or drill a hole in the vanity to thread it through. And if your toilet is across from the sink, you’ll have no way to run a hose to your sink’s plumbing without creating a trip hazard.

Second, you’ll need to run your sink until the water is warm before sitting down to use a non-electric warm water bidet. Skip this step and you’ll be facing a chilly bidet wash until warm water can make its way from your home’s water heater to your bathroom.

We know there are situations where a non-electric bidet just makes sense. But after testing hundreds of bidets, we recommend that you buy an electric bidet if you want warm wash water. It’s a better experience all around!

Ready to Upgrade Your Bathroom Experience?

Bidet features and options go beyond water heater types. There’s a lot to consider when it comes to finding the right choice for you! If you’re feeling overwhelmed or just want to talk it out with an expert, our amazing team is here to help!