Grundfos 99163906, ALPHA2 15-55F/LC Cast Iron Circulator Pump with GF 15/26 Flange and Line Cord, 1/12 HP, 115 Volts, 1 Phase, .65 Amps, 21 GPM Max, 19 ft Max Head, Variable Speed Pump, Closed System

SKU #: 99163906
Brand: Grundfos
Available For Order! (Usually Ships 3-5 Days)This product is direct shipped from the manufacturer to our distribution center where it is checked, packaged and processed by our quality control team. The shipping time shown is the estimated number of business days the product will ship out from our wa
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Grundfos Alpha2 15-55F/LC Circulator Pump

ALPHA2 is the best pump to withstand the tough conditions in a heating system, and with four newly added features, it just got even tougher.  First it has a robust start-up, which shakes free any impurities before the pump starts at the beginning of the heating season.  Next is summer mode, and this is an adjustment of the pump’s performance in the summer to the warmer temperature outside – giving customers extra energy efficiency.  It also includes a magnetite resistance, which ensures that no small pieces of metal get stuck in the pump’s vital parts when they are magnetise.  Lastly is dry-running protection, which makes sure the pump never runs without liquid in the system.  This pumps new features are added to the already unrivalled energy efficiency, easy installation and the fact that ALPHA2 covers both your heating demands and up to 90 % of your air-conditioning and cooling demands.


  • Simple push button
  • Control enables the ALPHA2 to be programmed in one of 3-constant speed, 3-constant pressure, or AUTOADAPT control modes
  • AUTOADAPT selects best performance curve for efficiency and comfort
  • New flow meter for trouble-shooting and balancing
  • The large LED display shows the current energy consumption in Watts and estimated flow in gallons per minute
  • ALPHA2 is complete with an integrated check-valve, foam insulation jacket, and nut captures for flanges
  • Robust startup enables the ALPHA2 to continuously attempt to restart – indefinitely – in blocked rotor conditions
  • Innovative plug simplifies pump connection
  • 6 foot, 3-prong power cord
  • Insulation shells included
  • ALPHA2 can be used as a replacement for more than 30 competitor pump model


  • Systems with constant or varying flow
  • One pipe systems
  • Two pipe systems
  • Underfloor-heating
  • Domestic hot-water recirculation
  • Systems where night setback is required

Note:  Image is illustrative and may not reflect details of actual product.

Please see the manuals for specifications on this item

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*Note: Picture is illustrative and may not reflect the actual product.*