Onsen, live from CES !

No compromise on comfort

Guarantees hot water availability that fits your family’s personal habits and lifestyle

Energy savings

Produces only the necessary hot water quantities at best cost

Budget efficiency

Gives full visibility on your hot water consumption and enables you to monitor your budget


Extends your current hot water installation lifespan and contributes to environmental sustainability

Did you know ?

46 M

EU installed residential electrical water heater

36 %

Of owners complain about lack of hot water (16 M households)


A single bath consumes nearly half of a typical water tanks* capacity
*stored at 55°C

10 years

Water heater tanks average lifespan


Energy expense of a typical household is water heating

225 L

4 people household** having each a 7mns shower per day exceed a typical water tanks*** capacity
**2 adults and 2 teenagers
***200 l

In Your Bathroom

Instant visibility on individual hot water availability and shower duration. Request extra hot water and get notified when ready.

illustrative image

User friendly & simple

Conveniently located in your bathroom, it’s easy to operate by all members of the family.

illustrative image


Gives you instant visibility on individual hot water availability and shower duration

illustrative image


Request an instant shower, get inform when it will be ready

illustrative image

Fun & challenges

Encourage family members to complete energy saving challenges

OnsenTM can conveniently be positionned in your bathroom,

hung on your rack, stuck on a wall, or simply set on its stand, to deliver the maximum value right where you need it.

illustrative image
illustrative image
illustrative image

In the palm of your hand

Manage your family members’ preferences and monitor your hot water consumption and budget.


Receive notifications when your shower is ready and get visibility on your current hot water availability.


OnsenTM integrates seamlessly into Delta Dore Smart app and metering offer.

illustrative image

An AI powered manager plugged onto your existing electrical water heater

OnsenTM patented AI combines patterns or users’ consumption and energy price, to determine when to switch on and off to produce only produces the right quantities of hot water at the right time, saving energy and money while delivering comfort at all time.

illustrative image


Bathroom remote

  • Screen: white led matrix with capacitive touch
  • Water level indicators: 10 levels
  • Wireless: X3D, up to100m line of sight indoor (328 feets)
  • Batteries (included): 4 batteries iron lithium batteries AAA LR03. 2 years lifetime, standard usage.
  • Water resistance: IPx4
  • Dimensions: 100 x 100 x 22 mm (3.9 x 3.9 x 0.86 in)
  • Weight: 80 g (2.8 oz)
illustrative image

AI Hot water manager

  • Wireless: Wi-Fi 2.4 Ghz 802.11n, and X3D
  • Power input: AC 100-240 V 50/60 Hz
  • Water debit measurements: pression max 1.5 Mpa, debit 1 l to 30 l/min. (0.26 to 8 gal/min.), acquisition every 5 ms to 100 ms
  • Dimensions: 150 x 150 x 50 mm (5.9 x 5.9 x 1.9 in.)
  • Weight: 250 g (8.8 oz)
illustrative image