This design uses low voltage to power the relay. The advantage is the increased safety due to the reduced voltage which runs through the float switch(es). A 12V DC transformer is used to power the relay to switch 120 VAC power to run your pump or solenoid. The 12V power supply cable is 5 feet long.

This upgrade can be added to any topoff controller.

This topoff controller minimizes the space required for mounting the float switch so even if you have a small aquarium, you can still enjoy not having to manually topoff your tank. Requires a 1.5"x1.5" footprint. Water level is adjustable from 1.5" to 7" below the top of your tank. You can choose between a single or double float switch.

Autotopoff Nano - Single Switch: $40     Mount Style: 0.5 inch bracket 1 inch bracket Bend your own bracket Autotopoff Nano - Double switch: $55     Mount Style: 0.5 inch brackets 1 inch brackets Bend your own brackets

This upgrade will make the topoff controller fill from the bottom float switch to the top float switch. It will apply power when water level falls below the bottom switch and stay powered until the top switch goes high. This mode of operation is better for RO membranes as it the RO system will run for a longer period of time. Be aware that you lose the second switch backup protection with this option.

You can also reverse the latching functionality by removing both floats and reversing them so the magnets inside the float are at the bottom. This will make the topoff controller empty your tank from the top float switch to the bottom float switch. So when your water level raises and triggers the upper float switch the controller will turn on. It will stay on until the lower switch goes low. This is often used for water change systems.

This upgrade can be added to double switch topoff controllers.

This option adds the latching functionality plus an additional 'upper' style float switch which acts as a fail-safe. You will probably want to purchase an additional mounting bracket to assist with mounting the third float switch (available on our misc page).

This upgrade can be added to double switch topoff controllers.

Controller with 3 horizontal float switches. Two for the latching functionality (fill from the lower to the middle) and a third which acts as a fail-safe. You need to drill a 3/4" hole to mount the horizontal float switches. Float switches are wired to the controller and you will need to cut them, mount the float switches and re-attach to the controller using the included crimp connectors. Float switch wires are 18" long. We have 3/4" diamond drill bits available on our float switches page.

This upgrade can be added to double switch topoff controllers.


out of stock. Est Arrival 5/6

This option adds a lower style float switch with the float reversed which prevents the topoff pump from running dry. The run-dry switch is submerged in your topoff reservoir and if the water falls below it, the controller will turn off your topoff pump.

You will probably want to purchase an additional mounting bracket for mounting the run-dry switch. Keep in mind the float switches are each ~2ft long so you may need a float wire extension if your sump or tank and reservoir are a ways apart.

This upgrade adds a switch that must be pressed to 'reset' the controller after your water level activates it. This is commonly used so when your tank, sump or overflow overflows the switch will trigger the controller to shut off your return pump or similar and will not restore power after the water level falls until the reset switch is pressed. This prevents a the controller from cycling on and off continually in the event your overflow is partially clogged and can't keep up with your return pump or similar.

This uses a 220VAC relay for international customers. The plugs on the cords will still be North American style (NEMA 5-15) so you will need adapters for both male and female plugs to convert to your style of plugs.

This upgrade can be added to any topoff controller.

This uses a 24VAC relay.

This upgrade can be added to any topoff controller.

This controller is similar to our topoff controllers but uses a GRI water sensor instead of a float switch. Upon sensing water the controller will either turn off or turn on power. You can also add additional water sensors for +15$ each by using the misc payment item below. Includes a low voltage relay and power supply as the GRI sensors run on 12VDC. The GRI sensor leads are 6 feet. GRI Water Sensors are triggered by a moisture bridge across the sensor contacts. The GRI Water Sensors can detect a layer of water as minute as 1/16 of an inch in depth which makes them great for use as a fail-safe. Our GRI controller does not include a mounting bracket.

We have found that the GRI sensors don't hold up very well to being repeadily submerged in seawater. These work great as a fail-safe such as detecting when water overflows onto your floor.

Power ON when Water detected Power OFF when Water detected Water Sensor Controller  $40

This controller switches power between your household power and a battery backup when you have a power outage. It has two power inputs and one power output. Plug one input into the wall and the one labeled 'battery' into a battery power supply (inverter). This can either power a device from the grid and switch to battery when the power goes out, or only power the device during an outage.

Will handle devices up to 10A or 1200 watts.

You will need an SLA (Sealed Lead Acid) or car battery and a power inverter. You can also incorporate a carger in your system so your battery always has a full charge. www.zbattery.com has batteries, inverters and chargers.

If you need more then just a custom bend please email us with your specifications for a quote.