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H2Ocean Compact Auto Top-Up
This ultra-compact smart auto top-up unit is simple to mount, easy to use and has twin optical sensors for added security.


• Auto Top-Up Unit (ATO)
• Compact intelligent sensor with twin optics and visual alarm
• Built-in real-time failsafe protection
• No moving parts to fail
• Small footprint
• Easy to install
• Plug & Play
• Complete with DC Top-Up Pump





  • Power input: 100˜240 VAC 50-60 HZ
  • DC Pump: Head 250cm, Flow rate: 280 lph
  • Glass mounting thickness 12.5mm
  • Pipe size 9mm OD - 6.5mm ID , 2 meters Long


Recomended for aquariums above 50L in volume, for nano or pico tanks below this volume the AutoAqua Smart Nano ATO can be used.


Optional Smart AC Switch

An optional smart switch is available to replace the supplied DC pump. This will allow the D-D ATO to operate a mains powered AC pump, solenoid or automatic valve. The Smart Switch simply plugs into a DC pump output socket to give a controllable mains UK plug outlet.


Smart Switch specification

  • AC power outlet 230-240v
  • Maximum load 10A / 2400 W (at 240 VAC)
  • 300cm DC connector cable
  • DC connector 5.5 x 2.5 male

H2Ocean Compact ATO User Manual