Fluval 07 Motor Head 307

• Genuine Fluval A20103 – the wide-body head; it will not seat on a 207 canister, and the 407 head will not seat on a 307.
• Restores 1,150 L/h rated output – and the 780 L/h in-service figure, which is what actually turns over a 330 L tank.
• 15 W sealed motor – the step up from the 10 W heads, and why the 307 holds 1.75 m of lift where the 207 stops at 1.45 m.
• Clearly worth rebuilding – unlike the 107, a 307 head costs meaningfully less than a complete filter.

• 1 x genuine Fluval motor head for the 307, part A20103, with sealed motor, pump housing, mains lead and plug

Fluval supplies this head bare. A head fitted without an impeller will not pump.

• The magnetic impeller. Order the impeller with ceramic shaft and rubber bushings (A20149), or move the old one across if it is clean and unchipped.
• The impeller cover. See the impeller cover (A20148).
• The motor head gasket. Reusable if still soft, but a head swap is the moment to renew it – see the motor head gasket (A20064).
• The canister, baskets and media. This is the top section only; the canister case for the 307 is separate.

The motor head maintenance kit for the 307 (A20096) covers the wear items in one go.

It fits the Fluval 307 and nothing else. The 307 and 407 share a wide canister body, which makes their heads look alike – but the motors are 15 W and 20 W and are not interchangeable. It does not fit the 407, 107 or 207, nor the 306, 305 or earlier, nor any FX-series filter. Fluval lists no supersession for A20103.

The four 07 heads are not interchangeable – each is matched to its own canister and motor rating. The model code is printed on the compliance label under the canister.

Fluval publishes three figures for the 307, describing three different situations. Only the middle one resembles a real installation.

Fluval publishes no intermediate points, so no curve is reproduced here rather than an interpolated one being invented. Expect flow to fall steadily as lift, hose length and elbow count increase. Note also that Fluval measures output at 120 V / 60 Hz; Australian units run at 240 V / 50 Hz, where the published draw is 15 W.

Suitable for a 307 that has lost the motor, runs hot, trips an RCD, or has cracked around the pump housing. Also for restoring the 1.75 m lift rating on a filter mounted low in a cabinet, where a tired motor shows up as failure to prime long before flow visibly drops.

Not suitable for a filter whose flow has fallen because the media is overdue – a 307 packed with clogged bio media reads exactly like a weak pump.

Supplied for 240 V / 50 Hz with an Australian plug. Unplug at the wall before removing the head, and never power it up with the canister open or dry – the bushings are water-lubricated and a dry start does measurable damage.

The mains lead is moulded into the sealed motor and cannot be replaced separately, so a damaged cord makes the head scrap rather than a repair. Run the filter on an RCD-protected circuit and form a drip loop in the lead. To make the head last, wipe the rotor chamber at every service – grit and calcium there is what scores the chamber and eventually kills the motor – and lubricate the gasket with silicone lubricant, never petroleum jelly.

• 07 output nozzle – for a return jet that has gone brittle or discoloured
• Media basket cover – worth checking while the head is off, since a cracked one lets water bypass the media
• Motor head for the 407 – if the compliance label says you have the other model

Supplied as a genuine Fluval service part. Fluval does not publish a separate warranty term for individual replacement parts; the published warranty attaches to the complete filter. Your rights under the Australian Consumer Law apply in full and nothing stated here limits them. Ships as a standard parcel anywhere in Australia, with no dangerous goods restrictions.

Does the Fluval A20103 motor head include the impeller?

No. The A20103 head ships without the magnetic impeller and without the impeller cover. The 307 takes impeller A20149, which is specific to this model.

Will a Fluval 407 motor head fit a 307?

No. The 307 and 407 share a canister body, so the heads look alike, but the 307 takes A20103 with a 15 W motor and the 407 takes A20104 with a 20 W motor.

My Fluval 307 will not prime any more. Is that the motor head?

Often, yes. Loss of priming is an early symptom of a tired motor, because priming demands more of the pump than steady running does. It usually appears before any obvious drop in flow.

How much power does a Fluval 307 motor head use?

Fluval publishes 15 W at 230–240 V / 50 Hz. Run continuously, that is roughly 131 kWh a year.