Does a Submersible Pump Need to Be Submerged? Wayne Pumps vs. Grey Water Lifting Stations

I've been ordering pumps for residential and commercial jobs for seven years. I make checklists now because I've made enough expensive mistakes. In my first year, I sold a submersible sump pump to a customer without explaining that it had to be submerged. A week later, the motor was dead. That mistake cost me a replacement pump plus a service call (ugh), and it taught me to ask: does a submersible pump need to be submerged?

What we're comparing

First, let's clear up the Wayne confusion. Wayne Water Systems makes pumps. Wayne Dalton makes garage doors and garage door openers. If you searched for a Wayne Dalton garage door opener, this is the other Wayne. I'm talking about the pump brand.

I recently took a call from a property manager near the Olive Garden Fort Wayne restaurant. They had a sump pump that kept short-cycling. The pump wasn't bad; it was raised on bricks so the motor sat above the water line. The contractor didn't know that a true submersible pump needs water around the motor. That call is why I'm writing this.

We'll compare two common ways to move water out of a low space: a true submersible pump, like most Wayne sump pumps, and a grey water lifting station, like the Grundfos Sololift2 C-3 grey water pump.

The short answer

A true submersible pump does need to be submerged. The motor casing is designed to transfer heat into the water around it. If the pump runs without water, the heat builds up and the seals fail. That's not a manufacturer quirk; it's the design. The installation manual for every Wayne submersible pump I've ordered says the same thing: place the pump in the basin, make sure the motor housing is under water, then start it.

If the pump says submersible, assume the pump body has to be in water before the motor draws power.

The Sololift2 C-3 grey water pump is different. It's an above-floor lifting station. Water drains into its tank by gravity, the float switch starts the motor, and a macerator pumps the grey water up to a higher sewer line. It doesn't sit in a pit and doesn't need to be submerged. As of January 2025, at least, the Grundfos product literature still lists the C-3 for grey water from sinks, washing machines, and showers.

Why submerged matters: cooling

Submersible pumps use the surrounding water as a heat sink. That's why running one dry is such a common killer. There's an old belief that a submersible pump can sit half-submerged and be fine because the motor is sealed. That comes from an era when motors had more metal and more thermal margin. Today's compact pumps run hotter. They need water.

The Sololift2 C-3 grey water pump is air-cooled and made to be mounted on a wall or floor. It doesn't rely on water around the motor, so if you dropped it into a sump pit, that would be just as wrong as running a submersible dry.

Verdict: Submersible needs water around the motor. Lifting station doesn't.

How they prime (or don't prime)

A submersible pump pushes water, it doesn't pull it up a long suction line. It's installed at the bottom of a basin where the water naturally surrounds the intake. If the water level drops below the intake, the pump loses prime. You can hear the impeller churning air, but no water moves.

A lifting station works on gravity, not suction. The grey water from a sink, shower, or washing machine flows down into the tank. The float switch reads the water level, then the macerator chops and pumps it upward. That's why a Sololift2 C-3 grey water pump can handle a basement bathroom without tearing up the concrete floor.

Verdict: Submersible needs to sit in the water. Lifting station just needs a gravity-fed inlet.

What actually breaks

The failure I deal with most on submersible pumps is dry-running. The seals dry out, the motor gets hot, and the float switch may be stuck against the side of the basin. The fix is usually lowering the pump into the pit and giving the float room to move.

Grey water lifting stations fail in a different way: debris jams the macerator. I once spent $450 on a service call because a small bolt had fallen into a tank during a renovation and jammed the impeller. The pump was fine; the loose hardware wasn't.

That brings me to a weird search term: cobolt bolt. If you're looking for a replacement fastener for a pump, you probably mean a cobalt bolt. Use stainless steel or a cobalt-grade bolt near water, not a zinc-plated hardware bolt. It's a small part, but it can be the reason a pump stops working.

Verdict: Submersibles die from lack of water. Lifting stations die from junk inside the water.

The cost question nobody asks

A Wayne submersible pump can look way cheaper than a Sololift2 C-3 grey water pump. But compare the whole system, not the pump alone. A submersible install often needs a basin, a float switch, a check valve, and a vented discharge pipe. A lifting station usually comes with the tank, pump, and controls in one box.

I learned this after quoting a pump without mentioning the check valve. The customer saw a low price, then got an invoice with the rest of the parts and felt scammed. That's on me. Now I ask what's NOT included? before I ask the price.

Honestly, I'm not sure why some order forms still list the check valve as an optional extra. My best guess is that it makes the base price look lower. But the vendor who lists all fees upfront, even if the total looks higher, is usually the one that costs less in the end. Transparent pricing builds trust; surprise add-ons don't.

Verdict: Cheapest base pump can be the most expensive total. Ask for the full system.

Which should you choose?

If groundwater collects in a pit, choose a submersible pump from Wayne or another reputable pump brand. Keep the pump body under water and make sure the float switch isn't trapped. If you're asking does a submersible pump need to be submerged because your newly installed pump is sitting above the water level, the answer is yes. Lower it or fix the pit before you burn it out.

If you need to move grey water from a basement sink or laundry drain up to a higher sewer line, the Sololift2 C-3 grey water pump is the better tool. It doesn't need a pit, it doesn't need to be submerged, and it can handle grey water from a washing machine, sink, or shower. It's not designed for storm water or raw sewage, so don't force it into that job.

There's no single winner. The right pump depends on the water source. I'd rather buy a transparent quote for the right system than a cheap pump with hidden extras.

A quick checklist before you order

• Is the water going to collect in a pit? That's a submersible job.
• Is the water going to flow to the pump by gravity? That's a lifting station job.
• Does the motor need water for cooling? If yes, keep it submerged.
• Does the quote include the float switch, check valve, and basin? If not, ask why.
• Is the discharge pipe sized for the vertical lift? A long lift needs the right pipe diameter.

I'm not a mechanical engineer, so I can't walk you through every impeller curve or seal specification. What I can tell you from seven years of ordering and troubleshooting pumps is this: most failures I've come across started with someone ignoring the water level. A submersible pump needs to be submerged. A lifting station doesn't. Ask that question before you buy, and you'll save the service call.