Red Lion RL-SP33V
#5 in Up to 1/3 HPFull review
For a narrow pit on a budget, where a light pump with good flow and a vertical float does the job.
Amazon $114.99$114.99
The Red Lion RL-SP33V is the better sump pump overall, rated 3.4 to 3.0. The Red Lion RL-SP33V leads on value and flow. The Liberty Pumps S37 wins on warranty. The Red Lion RL-SP33V costs $50.01 less ($114.99 vs $165).
Liberty Pumps S37
#12 in Up to 1/3 HPFull review
For a newer house or a gritty pit where a low cost Liberty pump that resists debris jams is enough.
Amazon $165$165
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Red Lion RL-SP33V for value ($48.60 per 1,000 GPH at 10 ft ($114.99, 2,366 GPH) vs $78.57 per 1,000 GPH at 10 ft ($165, 2,100 GPH)) and flow (2,366 GPH at 10 ft vs 2,100 GPH at 10 ft).
- Choose the Liberty Pumps S37 for warranty (3-year warranty vs 2-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 1/3 HP sump pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Red Lion RL-SP33V | Liberty Pumps S37 |
|---|---|---|
| Overall rating | 3.4/5 | 3.0/5 |
| Value 30% | 83 $48.60 per 1,000 GPH at 10 ft ($114.99, 2,366 GPH) | 43 $78.57 per 1,000 GPH at 10 ft ($165, 2,100 GPH) |
| Flow 30% | 58 2,366 GPH at 10 ft | 40 2,100 GPH at 10 ft |
| Build 20% | 33 switch fits a narrow pit | 33 switch fits a narrow pit |
| Warranty 20% | 25 2-year warranty | 50 3-year warranty |
Specifications
| Red Lion RL-SP33V | Liberty Pumps S37 | |
|---|---|---|
| Pumping | ||
| Motor | 1/3 HP | 1/3 HP |
| Type | Submersible | Submersible |
| Flow at 10 ft | 2,366 GPH | 2,100 GPH |
| Flow at 0 ft | 3,137 GPH | - |
| Max lift | 26 ft | 25 ft |
| Discharge | 1.5 in | 1.5 in |
| Running current | 4.4 A | 6.5 A |
| Switch and build | ||
| Switch | Vertical float | Vertical float |
| Cast iron housing | No | - |
| Alarm or monitoring | No | No |
| Wi-Fi | No | No |
| Cord length | 8 ft | 10 ft |
| Weight | - | 14 lb |
| Warranty | 2 years | 3 years |