Product images are representative.
Report an issue with this listingCirculator Pump, 3 HP
$1,126.99/ea
Key Features
- Max flow rate148 GPM
- Max head40 ft
- Motor horsepower3 HP
- Casing / wetted materialCast iron
- Seal typeSealless (wet-rotor)
- Mounting / orientationInline
Product Information & Specifications
Product Information
| Manufacturer | Grundfos |
|---|---|
| Mfr Model # | ALPHA1 |
| FlowSpec SKU | GRU-ALPHA1-4 |
Dimensions
| Inlet size | 2 in |
|---|---|
| Discharge size | 1.5 in |
| Dimensions (L×W×H) | 16 × 11 × 13 in |
Details
| Weight | 51 lbs |
|---|---|
| Max head | 40 ft |
| Duty type | Continuous |
| Seal type | Sealless (wet-rotor) |
| Max pressure | 17 PSI |
| Max flow rate | 148 GPM |
| Certifications | CE, UL |
| Voltage / phase | 230/460V 3-phase |
| Motor horsepower | 3 HP |
| Max solids handling | N/A — clear liquids only |
| Max fluid temperature | 230 °F |
| Mounting / orientation | Inline |
| Casing / wetted material | Cast iron |
Description
The ALPHA1 brings permanent-magnet efficiency to everyday residential heating circulation at an accessible price, with easy proportional-pressure setup. A dependable choice for standard heating and hot-water loops.
The Grundfos ALPHA1 is a circulator pump offering max flow rate of 148 GPM, max head of 40 ft, motor horsepower of 3 HP, casing / wetted material of Cast iron, seal type of Sealless, and mounting / orientation of Inline.
Ratings & Reviews
- Quiet and efficientSample
Noticeably lower energy use than the unit it replaced. Very happy.
Dana W., Building Services · Aug 9, 2026
Write a review
Sign in to write a review.
Documentation
Documents open on the manufacturer's site.
Related pumps
Grundfos ALPHA2
Compact residential/light-commercial ECM circulator with AutoAdapt for hands-off, energy-efficient heating circulation.
Grundfos MAGNA1
Fixed- and proportional-pressure ECM circulator for heating and cooling loops where a sensor-driven MAGNA3 isn't required.
Grundfos MAGNA3
High-efficiency ECM circulator for heating, cooling, and hot-water systems, with built-in differential-pressure control.
Grundfos TP / TPE
Close-coupled single-stage in-line pumps for heating, cooling, and water-supply loops; TPE adds integrated variable speed.
Customers also viewed
Grundfos ALPHA2
Compact residential/light-commercial ECM circulator with AutoAdapt for hands-off, energy-efficient heating circulation.
Grundfos BM / BME
High-pressure booster modules for reverse-osmosis, desalination, and demanding water-treatment duty.
Grundfos CM / CME
Compact horizontal multistage end-suction pumps for boosting and general water supply; CME adds integrated variable speed.
Grundfos CMBE
Plug-and-pump horizontal multistage booster with a permanent-magnet variable-speed motor and built-in constant-pressure control.
Decades of application expertise
We've specified pumps across water, wastewater, chemical, and industrial process systems — so you get the right unit the first time.
Real engineering support
Talk to people who know the products, before and after the sale. No call-center scripts.
Quality you can stand behind
We carry trusted, proven brands and back every order with a straightforward satisfaction guarantee.