OEM vs Aftermarket W10872845 Dishwasher Pump Filter: Real Cost Analysis for Whirlpool

You're staring at a cart with an OEM Whirlpool pump filter for $87, and you just saw the same part number — W10872845 — from an aftermarket supplier for $41.99. That's a $45 difference. On a dishwasher that's maybe worth $600 used, that gap matters.

Here's what you actually need to know.

Quick Answer

For the W10872845 pump filter, aftermarket parts deliver identical function at roughly half the OEM price. This isn't a complex electronic board or precision motor — it's a filtration assembly where fit and material quality matter, and reputable aftermarket manufacturers hit those marks. Save the premium pricing for parts where it actually matters.

Side-by-Side Comparison

When OEM Makes Sense

You're under manufacturer warranty. If your Whirlpool WDT780SAEM2 or WDT970SAHV0 is still covered, using OEM parts keeps that warranty intact. Don't risk a $400 warranty claim over a $45 part savings.

You need same-day pickup. Some appliance parts dealers stock OEM filters locally. If you're hosting Thanksgiving dinner tomorrow and your dishwasher just quit mid-cycle, that convenience premium might be worth it.

You're repairing for resale. Listing "all OEM parts" adds perceived value when flipping appliances. Buyers don't know that aftermarket quality matches OEM, but they've been trained to think "OEM = better."

When Aftermarket Wins

Out-of-warranty repairs. Once Whirlpool's warranty expires, you're paying retail for the same part that costs them $12 wholesale. The aftermarket W10872845 uses identical polypropylene mesh and ABS housing — your dishwasher can't tell the difference.

You're fixing rental properties. With multiple units, that $45 per repair adds up fast. A landlord with five dishwashers saves $225 buying aftermarket without sacrificing reliability.

The part failed once already. If your OEM pump filter clogged or cracked after two years, paying double for the same design makes no sense. The aftermarket version uses the same specs — it'll last just as long.

Compatible across dozens of models. This filter fits everything from the WDT920SADM series to WDT730PAHZ0 and WDT750SAHZ0 units. One aftermarket part replaces six different OEM numbers (W10872845, W10393351, WPW10693534, 8579307, AP6030094, PS11759673), which tells you Whirlpool's been using the same basic design across model years.

The Manufacturing Reality Nobody Mentions

Here's what appliance techs know: most "OEM" parts aren't made by Whirlpool. They contract manufacturing to the same facilities that produce aftermarket parts. Your $87 OEM filter and the $41.99 aftermarket version might literally come from the same production line — one gets a Whirlpool label, the other doesn't.

The pump filter assembly isn't rocket science. It's injection-molded plastic housing with a mesh screen and rubber seal. The specs are public (it has to fit the pump housing), and any decent manufacturer can replicate it. What you're paying for with OEM pricing is brand markup and dealer margins, not superior engineering.

Our Verdict

Buy aftermarket for the W10872845 pump filter unless you're under warranty or need same-day local pickup. The $45 savings is real money, and the functional difference is zero. We've installed hundreds of these across WDT-series Whirlpool, KitchenAid, and Maytag dishwashers — the aftermarket version lasts just as long and filters just as well. Put that $45 toward dishwasher detergent instead.

Frequently Asked Questions

Will aftermarket W10872845 void my Whirlpool warranty?

Yes, if you're still under manufacturer warranty. The Magnuson-Moss Warranty Act says they can't void your entire warranty just for using aftermarket parts, but they can deny claims related to that specific part. Once your warranty expires, it's irrelevant — use whatever part makes financial sense.

How do I know the aftermarket filter will fit my WDT920SADM2?

Check the compatible models list. If your model number appears (WDT920SADM1, WDT920SADM2, WDT920SADM3 are all listed), it's a direct fit. The pump housing dimensions haven't changed across these series — Whirlpool used the same pump assembly from 2014 through current production in these models.

What if the aftermarket part fails in three months?

That's why warranty matters. The Heima aftermarket version includes a one-year warranty versus 90 days typical for OEM. If it fails (rare for a simple filter assembly), you're covered longer. Keep your receipt and the part swap takes 15 minutes — way less hassle than people imagine.