Grundfos SCALA1 3-45 115V

Last updated: November 2, 2026

Grundfos SCALA1 3-45 115V
3.1/5#9 of 14 in fixed speed booster pumps
3.1

A tidy all-in-one booster for a low pressure supply or a storage tank where steady constant pressure is not essential. Most buyers spending this much should step up to the SCALA2.

  • 150 ft (65 psi)Head
  • Fixed speedDrive
  • 0.8 HPMotor
Check price at Amazon$821.64

Price checked November 2, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • Starts and stops on its own and plugs into a standard outlet, with no separate switch or controller to fit
  • Dry-run, anti-cycling and maximum runtime protection guard against a lost supply or a leak
  • Bluetooth setup through the Grundfos GO app lets you adjust it without opening anything
  • Rated for outdoor installation
Cons
  • Fixed speed, so pressure still rises and falls as taps open and close
  • Accepts only 43.5 psi at the inlet, so it suits weak supplies rather than topping up decent ones
  • Costs nearly as much as the variable speed SCALA2

The Grundfos SCALA1 family

Every Grundfos SCALA1 model we rank, smallest first. Ratings compare each against its own drive.

ModelFlowRatingPrice
Grundfos SCALA1 3-45 115V (this one)-3.1/5$821.64
Grundfos SCALA1 5-55 230V-3.4/5$1,122.89

How it scores

The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its drive. How we rank explains each one.

Specifications

Model number99631742
Pumping
DriveFixed speed
Maximum head150 ft (65 psi)
Highest inlet pressure43.5 psi
Motor0.8 HP
Input power950 W
Ports1 in
Protection and build
Built-in tankNo
Dry-run protectionYes
Overheat protectionYes
Outdoor ratedYes
Voltage120 V
Noise55 dBA
Weight26.4 lb
Warranty2 years

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