Aidpath EVO BOOST5
A strong, outdoor rated inverter booster for a larger home with weak pressure. The short warranty is the trade off for the price.
Amazon $521.88$521.88
The Aidpath EVO BOOST5 is the better water pressure booster pump overall, rated 3.5 to 3.0. The Aidpath EVO BOOST5 leads on pressure. The Grundfos SCALA2 3-45 115V wins on warranty, protection and noise. The Aidpath EVO BOOST5 costs $357.12 less ($521.88 vs $879).
Grundfos SCALA2 3-45 115V
#12 in Variable speedFull review
The benchmark compact inverter booster for a house of up to three floors and eight taps on weak city pressure. Pay for it when quiet running and steady showers matter more than price.
Amazon $879$879
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 Aidpath EVO BOOST5 for pressure (197 ft maximum head (about 85 psi) vs 148 ft maximum head (about 64 psi)).
- Choose the Grundfos SCALA2 3-45 115V for warranty (2-year warranty vs 1-year warranty), protection (dry-run and overheat protection vs dry-run protection) and noise (47 dBA vs 50 dBA).
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 | Aidpath EVO BOOST5 | Grundfos SCALA2 3-45 115V |
|---|---|---|
| Overall rating | 3.5/5 | 3.0/5 |
| Value 30% | 55 $19.69 per gpm ($521.88, 26.5 gpm) | 0 $66.59 per gpm ($879, 13.2 gpm rated; maximum not published) |
| Flow 15% | 84 26.5 gpm maximum | 24 13.2 gpm rated; maximum not published |
| Pressure 15% | 100 197 ft maximum head (about 85 psi) | 73 148 ft maximum head (about 64 psi) |
| Protection 10% | 60 dry-run protection | 100 dry-run and overheat protection |
| Noise 10% | 80 50 dBA | 92 47 dBA |
| Warranty 20% | 0 1-year warranty | 50 2-year warranty |
Specifications
| Aidpath EVO BOOST5 | Grundfos SCALA2 3-45 115V | |
|---|---|---|
| Pumping | ||
| Drive | Variable speed | Variable speed |
| Maximum flow | 26.5 gpm | - |
| Maximum head | 197 ft (85 psi) | 148 ft (64 psi) |
| Highest inlet pressure | - | 87 psi |
| Motor | 1.2 HP | - |
| Input power | - | 560 W |
| Ports | 1 in | 1 in |
| Protection and build | ||
| Built-in tank | - | Yes |
| Dry-run protection | Yes | Yes |
| Overheat protection | - | Yes |
| Outdoor rated | Yes | Yes |
| Voltage | 120 V | 120 V |
| Noise | 50 dBA | 47 dBA |
| Weight | 20.4 lb | 22 lb |
| Warranty | 1 year | 2 years |