Guide · Power and electrical safety
Aquarium electrical safety basics
The habits aquarium makers and safety bulletins agree on: drip loops, dry plugs, unplugging before you reach in, ground-fault protection and when to call an electrician.
Short answer
Keep water away from plugs and outlets: make a drip loop in every cord, keep plugs dry and above splash height, and unplug equipment before you reach into the tank. Aquarium makers and safety bulletins also recommend ground-fault protection on aquarium circuits. Never open mains-powered equipment, and call a licensed electrician for anything involving outlets or wiring.
Make a drip loop in every cord
A drip loop is a dip in the cord that hangs lower than the outlet, so water running down the cord drips off at the bottom instead of following it into the socket.
- Aquarium Co-Op tells users to make a drip loop in the air pump's power cable before plugging it in, to keep water from reaching the wall outlet.[1]
- JUWEL's manual says power plugs must not get wet and should be connected so the cable forms a loop that lets water drip off.[2]
- Tetra advises a drip loop with its Whisper air pumps.[3]
Check every cord, including lights, timers and feeders, not only the pump.
Keep plugs and devices dry
- Plugs and power strips sit above splash height and away from the tank's back edge, where lid condensation drips.
- Equipment meant to stay dry, stays dry. Aquarium Co-Op says its air pump must never be submerged.[4] EHEIM says its autofeeder must never be immersed, and that its drive unit and air intake must not sit in the humid air of an open aquarium.[5]
- Indoor use only. Tetra says its Whisper pump is for indoor use only.[3]
- Keep pumps above the water line, or add a check valve. Water can siphon back into a pump below the tank in an outage; see air pump above or below the tank.
Unplug before you reach in
JUWEL's manual says to unplug all devices operated in water before touching the water.[2] Make it part of every water change and cleaning session. Unplug at the plug with dry hands, and plug back in only once your hands and the cords are dry.
Ground-fault protection
A ground-fault device cuts the power when current leaks somewhere it shouldn't, such as through water. In North America it is usually called a GFCI (or GFI); in Europe, an RCD or residual-current breaker.
- JUWEL says aquarium electrical devices should always run through a residual-current breaker with a maximum 30 mA trip current, or a power strip with one built in.[2] That is European manual wording, not a North American rule.
- An Ontario teachers' union safety bulletin says school aquarium appliances should be connected only to a circuit with a ground fault interrupter, with drip loops on cords leading away from the tank.[6] It is one safety organization's guidance, not a code.
We found no North American code or regulator source on aquarium circuits specifically, so we don't tell you what your code requires. Ask a licensed electrician whether the outlet your tank uses is ground-fault protected, and to add protection if it is not. Do not wire outlets yourself.
Know what the safety standard covers
In the US, UL 1018, Electric Aquarium Equipment, covers household and commercial electric equipment used on or in indoor aquariums at 300 volts or less, such as heaters, pumps, filters and aerators.[7] A mark from a recognized lab shows the product was certified to a standard; the certification marks guide explains which marks to look for.
Don't open mains equipment
When a pump gets loud or stops, the cause may be a wear part. Tetra says a Whisper pump that stops producing air or gets very loud may have a worn rubber diaphragm, which its warranty does not cover.[3] Contact the maker rather than opening the case.
Next
Questions
What is a drip loop?
A low dip in a power cord below the outlet, so water running down the cord drips off at the bottom instead of reaching the plug. Aquarium Co-Op, JUWEL and Tetra all tell users to make one.[1][2][3]
Do aquariums need a GFCI outlet?
Aquarium makers and safety bulletins recommend ground-fault protection: JUWEL says to use a 30 mA residual-current breaker, and an Ontario teachers' union bulletin says school aquariums should be on a GFI circuit. Your local electrical code governs; ask an electrician.[2][6]
Should I unplug equipment before putting my hand in the tank?
JUWEL's manual says to unplug all devices operated in water before touching the water. It is a sensible habit for any tank.[2]
What safety standard covers aquarium equipment?
UL 1018, Electric Aquarium Equipment, covers household and commercial electric equipment used on or in indoor aquariums at 300 volts or less, such as heaters, pumps, filters and aerators.[7]
Can I fix a pump that stopped working?
Not by opening it if it runs on mains power. Contact the maker; Tetra, for example, treats a worn diaphragm as a known wear part.[3]