Wassermann 4WDP5-55 115V
#9 in Fixed speedFull review
An inexpensive plug-in pump for a small cabin or RV hookup on a tank.
Amazon $81.69$81.69
The Wassermann 4WDP5-55 115V is the better water pressure booster pump overall, rated 3.2 to 2.9. The Wassermann 4WDP5-55 115V leads on pressure. The Wassermann 4WDP5-55 115V costs $18.30 less ($81.69 vs $99.99).
ZYIY 15GR-15 120W Booster
#13 in Fixed speedFull review
A small inline pump for one bathroom or a tankless heater that lacks pressure. Not a whole house booster.
Amazon $99.99$99.99
Prices were last checked November 2, 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 Wassermann 4WDP5-55 115V for pressure (127 ft maximum head (about 55 psi) vs 49 ft maximum head (about 21 psi)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every fixed speed water pressure booster pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Wassermann 4WDP5-55 115V | ZYIY 15GR-15 120W Booster |
|---|---|---|
| Overall rating | 3.2/5 | 2.9/5 |
| Value 30% | 65 $16.34 per gpm ($81.69, 5 gpm) | 71 $14.28 per gpm ($99.99, 7 gpm) |
| Flow 15% | 0 5 gpm maximum | 0 7 gpm maximum |
| Pressure 15% | 56 127 ft maximum head (about 55 psi) | 0 49 ft maximum head (about 21 psi) |
| Protection 10% | 50 protection not stated (neutral score used) | 50 protection not stated (neutral score used) |
| Noise 10% | 50 noise rating not published (neutral score used) | 50 noise rating not published (neutral score used) |
| Warranty 20% | 50 2-year warranty | 50 warranty not published (neutral score used) |
Specifications
| Wassermann 4WDP5-55 115V | ZYIY 15GR-15 120W Booster | |
|---|---|---|
| Pumping | ||
| Drive | Fixed speed | Fixed speed |
| Maximum flow | 5 gpm | 7 gpm |
| Maximum head | 127 ft (55 psi) | 49 ft (21 psi) |
| Input power | - | 120 W |
| Ports | - | 0.8 in |
| Protection and build | ||
| Built-in tank | No | No |
| Voltage | 120 V | 120 V |
| Weight | 6.8 lb | 7.2 lb |
| Warranty | 2 years | - |