Alpha2 15-55FR Variable Speed Circulator Pump w/ IFC, 1/16 HP, 115V


Brand: Grundfos

Mfr Part#: 99163932

Model: Alpha2 15-55FR

Availability: In Stock
Usually ships: Today, if ordered by 3pm
Qty Price
$168.95 / each & Free Shipping
x2 $329.90 & Free Shipping
(2 x $164.95 / each)
  • Description
  • Literature
  • Reviews (2)
  • FAQs

Alpha2 15-55FR model (rotated flange) is a cast iron variable speed circulator with AutoADAPT feature, designed for use in a variety of hydronic and radiant heating applications.
Note: this model replaces older Alpha model 59896878.
Grundfos: UP15-10F, UP15-42F, UPS15-58FC
Taco: 005-F2-2, 007-F5, 008-F6, 00R-MSF, 0015-MSF3
B&G: NRF-22, NRF-9F/LW
Armstrong: Astro 230CI, Astro 250CI, Astro 20, Astro 25, Astro 30
WILO: Star S 16F, Star S 21F, Star S 21RFC, Stratos ECO 16 RFC.


  • New and improved version of Grundfos bestselling Alpha circulator;
  • AutoADAPT feature allows the circulator to adapt to changes in the hydronci system to maximize energy savings;
  • Push button allows to select between AutoADAPT, constant speed (3 settings - Hi/Med/Low) or contant pressure (3 settings) modes;
  • Large LED display;
  • Built-in check valve;
  • Insulation jacket and (2) gaskets (O-rings) included;
  • Permanent magnet motor technology with robust startup enables pump to restart indefinitely when rotor is blocked;
  • Cast iron body for closed-loop heating applications;
  • Rotated flange accepts Grundfos GF15/26 and other brand flanges;
  • Hardwire model;
  • Made in the USA.

Technical Specifications:

  • Voltage: 115V;
  • Amperage: 0.65A;
  • Hertz: 60;
  • Phase: 1;
  • Watts: 5 - 45W (depending on mode selected);
  • Wiring: Hardwired;
  • Temperature Range: 36°F - 230°F;
  • Max Pressure: 150 psi;
  • Flow range: 0 - 21 GPM;
  • Head Range: 0 - 19 ft of head;
  • Material: Cast Iron;
  • Application: Heating only.


1 year from the date of installation
Alpha2 15-55FR Variable Speed Circulator Pump w/ IFC, 1/16 HP, 115V has an average 5.0 out of 5 rating based on 2 user reviews.
1 of 1 people found this review helpful.
Quiet, Works Great, Low Watts!
By Verified Buyer (from New Hampshire) on 3/30/2016
Using on Pellet boiler/ Buffer tank loop. Pump runs 24 hours/ 7 days a week. Using about a 1/4 of the watts of the previous taco pump it replaced & just about pumping the same GPM. Saving about $11-12.00/month on electric bill Based on that pump will pay for itself in about a year. excellent product!
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1 of 1 people found this review helpful.
Qite,easy to set and perform great
By Mich (from Los Angeles) on 12/19/2015
I had noisy radiant heating pump and needed something to replace it. Saw it in Uponor training and give it a try. It works nice with one loop as well as with 6 loops calling for heat. Great product. Great price and fast shipping
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