Grundfos ALPHA 15-58F Replacement

Verified specifications

AUTOADAPT: the ECM circulator continuously adjusts its speed to the system curve — no speed switch to set, and power draw drops to a fraction of a fixed-speed circulator. Grundfos GO remote control is available on supported models.

Supersession chain: ALPHA1 15-55F → ALPHA2 15-55F (discontinued Nov 30, 2024) → current ALPHA 15-58F. The ALPHA line is the direct ECM replacement for the UPS 3-speed circulators.

Supersession chain: ALPHA1 15-55F → ALPHA2 15-55F (discontinued Nov 30, 2024) → current ALPHA 15-58F. The ALPHA line is the direct ECM replacement for the UPS 3-speed circulators.

Rated duty only: Grundfos publishes the rated duty point (8.37 GPM / 11.16 ft), not hard max-head claims — we quote from the published curves, not distributor extrapolations.

Confirming the right replacement

Before we quote, compare these fields on your failed pump's nameplate. If any of them differ, send us a photo of the nameplate and we'll match it exactly rather than guessing:

• Full model number — including the part number (e.g. B&G P/N) where one exists
• Voltage and phase
• System duty: flow (GPM), head (ft), and fluid — heating water vs. potable water matters
• Flange size and orientation for in-line replacements

Other Grundfos models

• More Grundfos modelsBrowse every Grundfos model page we quote
• Grundfos UPS15-58FC3-speed predecessor — same footprint
• Grundfos UP15-42FSingle-speed predecessor — same flange

Documented equivalent replacements

The motors below are published as replacements for this model in the cross-reference tables cited. We confirm the match against your nameplate before quoting:

Cross references via Grundfos-published cross reference documents (VersaFlo UPS/TP guide L-UP-TL-008 and the competitive 3-speed pump cross reference). Match flange size, head, and flow to your system before ordering.