Wassermann WASBPGT55
A mid priced inverter booster with a longer warranty than its rivals, for a home on weak city pressure.
Amazon $360.08$360.08
The Wassermann WASBPGT55 is the better water pressure booster pump overall, rated 3.9 to 3.4. The Wassermann WASBPGT55 leads on warranty, pressure and flow. The Wassermann WASBPGT55 costs $39.91 less ($360.08 vs $399.99).
GWANZI K90S600L
#10 in Variable speedFull review
An inline inverter booster with a stainless shell for tight spaces. The cheaper H600 PRO from the same maker outpumps it.
Amazon $399.99$399.99
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 WASBPGT55 for warranty (2-year warranty vs 1-year warranty), pressure (180 ft maximum head (about 78 psi) vs 150 ft maximum head (about 65 psi)) and flow (24.2 gpm maximum vs 22 gpm maximum).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every variable speed water pressure booster pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Wassermann WASBPGT55 | GWANZI K90S600L |
|---|---|---|
| Overall rating | 3.9/5 | 3.4/5 |
| Value 30% | 69 $14.88 per gpm ($360.08, 24.2 gpm) | 59 $18.18 per gpm ($399.99, 22 gpm) |
| Flow 15% | 74 24.2 gpm maximum | 64 22 gpm maximum |
| Pressure 15% | 100 180 ft maximum head (about 78 psi) | 75 150 ft maximum head (about 65 psi) |
| Protection 10% | 50 protection not stated (neutral score used) | 100 dry-run and overheat protection |
| Noise 10% | 80 50 dBA | 50 noise rating not published (neutral score used) |
| Warranty 20% | 50 2-year warranty | 0 1-year warranty |
Specifications
| Wassermann WASBPGT55 | GWANZI K90S600L | |
|---|---|---|
| Pumping | ||
| Drive | Variable speed | Variable speed |
| Maximum flow | 24.2 gpm | 22 gpm |
| Maximum head | 180 ft (78 psi) | 150 ft (65 psi) |
| Motor | 1 HP | 1 HP |
| Input power | - | 800 W |
| Ports | - | 1 in |
| Protection and build | ||
| Dry-run protection | - | Yes |
| Overheat protection | - | Yes |
| Voltage | 120 V | 120 V |
| Noise | 50 dBA | - |
| Weight | 18.8 lb | 12 lb |
| Warranty | 2 years | 1 year |