• 4,100–8,300 L/h adjustable flow — dial speed to the system rather than running flat out, at 24–73 W depending on setting.
• 5.3 m maximum head — the deepest lift in the ReefRun G2 range below the 12000, useful for tall cabinets or a sump on a lower floor than the display.
• Sine-wave DC motor — Red Sea describes it as virtually silent from a standstill through full speed; no published dB figure.
• Fully submersible — installs inside the sump, with a 180° rotatable outlet for aiming the return without repiping.
• Inline Flow Controller included — manual on/off and speed control with no network needed; the ReefRun Dual Controller (sold separately) adds ReefBeat app scheduling and remote monitoring.
• Two-latch impeller access — service without disturbing the plumbing.

As with the rest of the ReefRun G2 range, Red Sea does not publish an input voltage rating or a decibel figure in the documentation we could access — we have left both off this page rather than guess.

The 8000 earns its place over the 6000 once you are pushing water up through more than a metre or so of drain plumbing, an inline UV steriliser, or a media reactor on the return line — situations where the flow lost to head and restriction eats a bigger share of the headline number.

Red Sea publishes the zero-head flow range and the maximum head figure but not a full flow-against-head curve at intermediate points (0.5 m, 1 m, 1.5 m, 2 m, 3 m); we have not found one in its manuals or on its site. Treat the 4,100–8,300 L/h figure as a best case.

Running continuously at a mid-speed setting of roughly 48.5 W (the midpoint of the published 24–73 W range) works out to about 425 kWh a year, or roughly $128 on a 30c/kWh tariff — your own tariff and flow setting will move that figure up or down.

Suited to larger marine and reef sumps, or any system with enough head loss that a 6000 would be working near its limit. Red Sea markets it for reef systems; we have not found a manufacturer statement on freshwater use either way. Not a substitute for an in-tank powerhead or wavemaker — it returns water from the sump, it does not circulate the display.

The two-latch impeller housing gives tool-free access — rinse the impeller and housing of calcium buildup or debris at your regular maintenance interval. The impeller is a wear item with its own 6-month warranty, shorter than the 2-year motor warranty.

Mains-powered equipment — run it through an RCD-protected circuit and keep a drip loop on the power cable.

Red Sea covers the motor for 2 years and the impeller, as a wear item, for 6 months — both in addition to your consumer guarantee rights under Australian Consumer Law. Standard parcel delivery.

Does this include a controller?

A basic Inline Flow Controller is included for manual on/off and speed control without Wi-Fi. The ReefRun Dual Controller, adding ReefBeat app scheduling and remote monitoring, is sold separately.

Is it submersible?

Yes — Red Sea's manual specifies installation "fully submerged, inside a sump."

Will I really get 8,300 L/h in my system?

Only at zero head, out of the box with nothing plumbed to it. Once it is lifting water through your drain, elbows and skimmer, expect noticeably less — size with margin rather than against the headline figure.

What voltage does it run on?

We have not been able to confirm a published input voltage figure for this model. Get in touch before ordering if you need it confirmed.