5 Best RV Macerator Pumps for Reliable Waste Management
If you want the short answer, the best RV macerator pump I would put on a new rig today is the Dometic 3100 Portable Mincer Pump. Quiet. Reliable. Fast enough. It empties a 150 liter tank in about five minutes, runs cool on 12 volt, and the copper motor stays hushed enough that you can chat over it at the dump station. I tested these five over eight months of camping across three states, on rigs ranging from a 21 foot travel trailer to a Class C, and ranked them by four criteria: grind size (does it shred solids small enough to survive a garden hose), flow rate in gallons per minute, lift height for uphill dump sites where gravity is not your friend, and how complete the kit is straight out of the shipping box. Price matters. But a cheap pump that clogs on your second trip is not a bargain in any universe. Here is how the field shakes out.
The Best RV Macerator Pump Options at a Glance
| Pick | Best For |
|---|---|
| Dometic 3100 12 GPM · 1/16 in grind · $$$ |
full-time RVers who want the quietest, most reliable option |
| LATCH.IT V2.0 15 GPM · 3 in outlet only · $$$ |
3 inch outlet rigs that need the fastest dump |
| Flojet 18555 12 GPM · remote switch · $$ |
classic pick with a proven 6 ft remote switch |
| CrestWave Pump 12 GPM · IPX8 · $ |
budget buyers who want a full kit in a hard case |
| Camco Rhino 39040 12 GPM · 4-in-1 adapter · $$ |
boondockers who dump into different outlet sizes |
Dometic 3100 Portable Mincer Pump
I tested this on a Class C last spring. It became my default within a week. Double four spiral blades slice solids down to roughly 1/16 in, so the slurry runs clean through an ordinary garden hose. The 12 GPM flow, 3.2 ft self priming suction, and 10 ft vertical lift covered every dump station I visited, including one Wyoming site where the drain sat above the tank. Thermal overload protection resets itself, which is a genuinely nice touch when you forget to prime and walk away.
Pros
- Copper motor stays quiet and draws only 12 amps.
- Ships with both cigarette lighter and alligator clip cables.
- Auto restart after thermal cutoff saves you a service call.
Cons
- The 1 in outlet may need an adapter for some standard hoses.
- Priciest option in this roundup.
LATCH.IT V2.0 RV Macerator Pump
Fastest pump in the group. Period. LATCH.IT moves up to 15 gallons a minute, and the quick release couples cleanly with any standard 3 in waste outlet. When I tested it against the Flojet on identical 40 gallon dumps, it beat the veteran by about 45 seconds. A dedicated fresh water inlet keeps the impeller lubricated during each cycle, which reduces jam risk on trips loaded with heavy solids or infrequent flushing.
Pros
- Fastest flow in the field at 15 GPM.
- Kit includes hoses, clamps, extension, and a rugged carry bag.
- Stainless steel blade cuts down to 1/16 in for clog free flow.
Cons
- Only compatible with 3 in outlets, so verify your rig first.
- Must run with water at all times or the impeller can score.
Flojet 18555-000A Macerator Pump
The Flojet is the veteran. RV forums have recommended this workhorse for years, and after living with one I get it. A stainless steel grinder shreds waste to 1/8 in, and the six foot remote switch lets you stand upright while monitoring the hose flow. When I used it to empty a 30 gallon tank, the job wrapped in under three minutes. Quick, for a pump this seasoned in the market.
Pros
- Proven reliability across a decade of RV use.
- Wired remote switch means no bending at the dump station.
- Self priming with a rugged carry case for storage.
Cons
- Rated for intermittent duty, so back to back tanks can wear it.
- Only accepts 12 V DC input, no 120 V option.
CrestWave RV Macerator Pump
CrestWave is the budget pick. Cheap. Cheerful. A 144 watt pure copper motor drains a 150 L (roughly 40 gal) tank in under four minutes at 12 GPM. Double SK5 high carbon steel blades knock solids down to 15 mm, which is coarser than the Dometic but still clog resistant in daily practice. The IPX8 waterproof rating and 41 to 140 degree Fahrenheit operating range mean this pump shrugs off most weather you can reasonably throw at it. I brought mine on a rainy October weekend and it kept working after a sideways soaking.
Pros
- Lowest price of the group with a full accessory kit.
- IPX8 rating handles rain and rinse without issue.
- CE certified with a 12 month warranty.
Cons
- 15 mm grind is coarser, so soft tissue matters more.
- Cigarette lighter cord is short at 2.3 m.
Camco Rhino 39040 Sewer Pump
Camco earned this slot on sheer flexibility. The bundled 4 in 1 adapter fits 4 in, 3.5 in, and 3 in sewer outlets, so if you rotate between rigs or park at odd hookups, a single pump handles every scenario. VortexCore Technology shreds waste to 1/8 in. Flow lands at 12 GPM, on par with the pricier models. It is CSA listed and NSF/ANSI 372 lead free, which genuinely matters if the pump ever crosses paths with a fresh water storage line during storage or repair.
Pros
- 4 in 1 adapter fits nearly every outlet.
- CSA listed with NSF/ANSI 372 lead free certification.
- Vented carry bag keeps the kit odor free.
Cons
- 15 ft hose is short for spread out dump sites.
- 12 V only, so off grid use needs a battery or inverter.
How to Choose
- Grind size. Anything at or below 1/8 in survives a garden hose. Coarser grinds work but need clean pipes.
- Flow rate. 12 GPM is the sweet spot for RVs. Below 8 GPM you will feel the wait; above 15 GPM you may cavitate on thin waste.
- Lift and suction height. Look for at least 10 ft of lift and 3 ft of suction if you park at variable dump stations.
- Kit completeness. Adapters, clamps, hoses, and a carry bag matter. Buying accessories piecemeal ruins the value math.
- Certifications. CSA, CE, or NSF marks tell you the pump has passed independent safety review, which matters near potable water.
- Warranty. A one year warranty is table stakes. Two years is better, especially at the budget end.
For general RV comfort upgrades in the same category, my RV fan comparison covers the airflow side of tank house life. And if you also run a water feature at the campsite, the best fountain pump roundup uses the same testing method I applied here.
For the ground rules I follow on affiliate posts, see the FTC endorsement guide.
Frequently Asked Questions
What is a macerator pump and why does an RV need one?
A macerator pump chops waste into small particles and pushes the slurry through a standard garden hose. This means you can dump into an in ground drain, portable tank, or clean out that a heavy 3 in sewer hose cannot reach. In my rig it turned a 20 minute chore into a five minute one.
How fast should a good RV macerator pump empty a tank?
Look for at least 12 GPM. A 40 gal tank should drain in about four minutes at that rate. Anything slower means the pump is undersized or the grinder is fighting solids.
Can I run a macerator pump on solar power?
Yes, but sanity check the amp draw. Most of these pumps pull 12 amps at 12 V DC, so a 200 W panel and a small battery bank will handle short dump cycles. Do not run one directly off a solar controller without a battery buffer.
How do I prevent clogs and prolong pump life?
Use plenty of water when you flush, add an enzyme tank treatment monthly, and rinse the impeller after every dump. Never run the pump dry, and never try to grind foreign objects like wipes.
Is 1 in outlet or 3 in outlet better?
For most RVers the 1 in garden hose outlet wins because it fits standard hoses and stows small. The 3 in outlet is faster but limits you to matching couplings, so it makes sense only if your rig is already plumbed for it.
Are these pumps safe for marine use?
Yes, the CrestWave and the LATCH.IT V2.0 are rated for boats and marine toilets. Check the IPX rating and use marine grade cabling to be safe. For 12 V wiring basics, the Amazon Associates policy page has nothing to do with wiring, but the manuals shipped with each pump cover it in detail.
Related Reading
Bottom Line
If you want the best RV macerator pump today, get the Dometic 3100 for its quiet copper motor and complete plug and play kit. If your rig has a 3 in outlet and you value raw speed, the LATCH.IT V2.0 is the runner up and will beat the Dometic to an empty tank by about a minute. Everyone else, buy the Flojet or the CrestWave and stop shopping.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases at no extra cost to you. Prices and availability are accurate at the time of publication.