Name: Zoeller M63 Premium
Brand: Zoeller
Price: 311.25 USD

3.0/5#9 of 16 in up to 1/3 HP sump pumps
3.0

For owners who want the longest lasting 1/3 HP class pump and are willing to pay for an all cast iron build and a 5 year warranty.

Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros

All cast iron, base included, so nothing plastic sits in the pit to crack or warp
A 5 year warranty, two years longer than the M53 it is built on
Made in the USA with a mechanical float that has no electronics to fail
Pumps about 2,000 gallons an hour at 10 ft, enough for a typical basement

Cons

Same flow as the cheaper M53, so you pay extra only for the cast iron base and warranty
Among the most expensive 1/3 HP class pumps
Flow falls off above 15 ft of lift

How it scores

The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.

Specifications

For a narrow or shallow pit with a low lift, where a cheap pump with the motor out of the water is the easiest fix.

$105.84

For a typical basement where a long lasting cast iron pump with a reliable float matters more than raw flow.

$216.29

For a typical basement where you want a proven cast iron pump that will run for years. Buyers with a lift over 15 ft should step up to a 1/2 HP pump.

$188.33