Instant water heaters, also known as tankless heating systems, are the gold standard in bidet cleansing. They heat water on demand so that you never run out of warm wash water, even if the seat is used several times in quick succession or if you run an extra-long wash cycle. While nearly perfect, one tradeoff to this type of heating system is that users often report a short burst of cold water at the beginning of the wash cycle, which is quickly followed by warm water. Many electric bidet seats come with instant water heaters, but those listed below truly stand apart from their competition.

Cascade 3000

The Cascade 3000 is packed with top of the line comfort and convenience features, including an instant water heater that generates unlimited warm wash water. The wash water’s temperature is adjustable, as is the seat temperature, water pressure, and warm air dryer temperature. Front and rear cleansing with adjustable spray position ensure thorough cleansing while the oscillating spray option moves the wand back and forth for greater wash coverage and enhanced relaxation. Other great features include an LED nightlight, a lid that can support up to 330 lbs (most bidet lids aren’t able to support an adult’s weight), a deodorizer, and an auto wash option that intiates a full wash and dry cycle at the touch of a button. A silver nano solution coats the interior tubing and nozzles to keep the wash water crystal clean as it journies through the unit, and the durable stainless steel nozzles self-rinse before and after each use for added cleanliness. While only available in white, the Cascade 3000 comes in both round and elongated seat sizes and is designed to fit on most one or two-piece toilets, including many French curve toilets. It offers two remote control options—small or large—and comes with a wall mountable docking station. Last but not least, the Cascade 3000 comes with a generous 4-year full warranty that allows you to relax about your investment. If you’re looking for a long-lasting, high quality seat with everything you need for next level cleansing—including an instant water heater—the Cascade 3000 might be for you.

TOTO S550e

TOTO’s S550e is one of the most feature packed bidet seats on the market and offers top-of-the-line cleansing, including an instant water heater that keeps the wash water warm no matter how long the wash cycle. The S550e has more wash options than most other seats, with front, rear, soft rear, and wide wash modes as well as oscillation and pulsating spray options. In addition, the S550e comes with a heated seat with temperature controls, LED nightlight, adjustable warm-air dryer, deodorizer, wireless remote control, and a lid that automatically opens and closes whenever someone walks towards or away from the toilet. Two user presets enable you to program your favorite settings into the remote for a personalized wash at the touch of a button, and sterile eWATER+ rinses the nozzles before and after each use, ensuring an ultra-hygienic cleansing experience. The S550e also features TOTO’s unique premist feature, which coats the toilet bowl with a thin film of water prior to use to stop waste residue from sticking so that you spend less time cleaning your toilet and more time enjoying life. If you’re looking for a high-quality, luxury bidet seat with an instant water heater, you really can’t go wrong with the TOTO S550e!

Brondell Swash 1400

Brondell’s Swash 1400 is one of our most popular sellers, and it’s no wonder given the wide range of high-end features that come with it. Most notably, the Swash 1400 has an instant water heater for unlimited warm wash water, and the water’s temperature can be instantly adjusted several degrees for an unbeatably comfortable cleansing experience. Its nozzles are highly adjustable for maximum cleansing coverage with seven front to back nozzle positions and three different spray width options. Other important features include front and rear cleansing modes, an adjustable heated seat and warm air dryer, and an LED nightlight, deodorizer, and nozzle oscillation. In addition to coming in at an affordable price point, the Brondell Swash 1400’s lid is “sittable”, meaning it’s able to safely support the weight of an average adult. The 1400 also comes with a sterilization system that releases trace amounts of silver into the water used for cleaning the nozzles to keep them sanitary. It’s available in white and beige as well as in round and elongated seat sizes, making it one of the most versatile seats available. If you’re looking for a seat with outstanding features and never-ending warm water, we highly recommend taking a look at the Brondell Swash 1400.

To see integrated bidets with instant water heating click here. To see all bidets with instant water heater click here.

Hannah Ramsey

Hannah Ramsey is a former writer at Many Bidets, where she spent seven years crafting and managing website content. With a background in psychotherapy and a lifelong passion for writing, Hannah enjoyed combining these interests to make a meaningful impact. Now retired from the bidet business, Hannah still enjoys sharing her knowledge about bidets with friends and family, proving that once a bidet enthusiast, always a bidet enthusiast!