Grundfos Alpha 2L 15-50 Product Code: 55237

Suitable for 40°C. 1½" BSP connection. Plug and pump - no need to open terminal box. IP42. EuP 2013 and 2015 compliant.


  • 7 Speed Settings
  • ErP Compliant
  • 2 Year Manufacturer's Guarantee (T&Cs Apply)
  • 5m Max. Delivery Head
  • 2°C to 110°C Max Temp. Range
  • Flow Volume Q Maximum 3.5m³/h
  • 0.032kW Maximum Applications
  • 3 Fixed Speeds & 4 Variable
  • 3 Fixed Speeds & 4 Variable
  • ErP Compliant


230V. . Port to port distance: 130mm. Temperature range: 2 to 110°C. Weight: 1.9kg. 4 variable speeds consist of 2 x constant pressure and 2 x proportional pressure.
Additional Information
Technical Specification
  • Brand : Grundfos
  • Product Type : Heating Pump
  • Power Output (Watts/Kw) : 0.032 kW
  • IP Rating : IP42
  • Central Heating Pump Product Type : Domestic Pumps
  • Total Product Weight : 1.9 kg
  • Connection Type : 1½" BSP Connection
  • Temperature Range : 2 to 110 °C
  • Pack Size : 1
  • Power Voltage Supply : 230 V
  • Manufacturer Guarantee : 2 Year Manufacturer's Guarantee (T&Cs Apply)
  • Pieces in Pack/Case : 1
  • Max Pump Head Size : 5 m
Product Contents
Pump, gaskets, mains plug, installation instructions.
Delivery & Returns


Standard delivery: €15

Free delivery on all orders over €70.00

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€163.95 Incl. 20% VAT

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Grundfos Alpha 2L 15-50 is rated 4.7 out of 5 by 12.
Rated 5 out of 5 by from Good Quality Pump I had to replace a 20 year old grundfos selectrica so decided to upgrade to a more energy efficient model. The pump is easy to install and super quite! The price needs to be more competitive as it can be found for £100 online, I wanted the gaurantee and peace of mind if anything went wrong.
Date published: 2017-11-30
Rated 5 out of 5 by from Great product I would recommend this as it is great is the most reliable product I have used and would not use any thing less as you need the job done once
Date published: 2017-08-20
Rated 4 out of 5 by from Very quite pump Easy to fit as i replaced a old one that was making a lot of noise It works good and I'm very happy wil it
Date published: 2017-08-20
Rated 5 out of 5 by from Replacement pump Very quiet and a high quality product which was easy to fit
Date published: 2017-03-24
Rated 5 out of 5 by from Very quiet quality pump Bought to replace a TP pump that was getting very noisy and vibrating. Easy to swap over, easy to connect the power cable to the power plug, plug everything in and switch on and away you go. This pump comes with a 5 yr warranty and has ceramic bearings, so am very hopeful for a long life. This pump is so quiet in operation - you can't hear it running.
Date published: 2016-12-07
Rated 4 out of 5 by from GRUNDFOS Alpha 2 Pump Picked up Sumday and fitted same Sunday. Can't say how reliable or what the performance will be but from the star it looks good on both counts.
Date published: 2016-11-15
Rated 4 out of 5 by from Poor technical support I bought this for my own house so I could have a play with it without having to let a customer watch me being very confused, and so learn while sorting out my heating which had the pump stuck on high speed. This was to replace an old, switched, 3 speed circulator. I have previously spent time on the Grundfos Ecademy (sic.) training to try to understand these modern pumps and had glanced at the technical downloads available. When I opened the packaging, I was dismayed to find instructions in incomprehensible pictograms. So I rang technical support (my internet was down, and I prefer paper format anyway) to be told that the 3 speeds are equivalent to the old three-speed pumps (fair enough) and the other 4 are 'all proportional' NOT constant pressure (flatly contradicting the technical info on the Grundfos website which states that 2 are constant pressure and 2 are proportional pressure) and that it is mostly 'a case of 'trial and error'. I got the impression the lady on the phone wasn't a very technical person, actually. So, if a product, designed at great expense by engineers, is to be fitted by people with no help to understand how it works, it is a waste of money - may as well just fit a standard UPS model instead of the Alpha. That said, HAD technical support not decided to fob me off and sent me the proper manual instead of the pictograms, I'd probably like this. As it is, don't bother spending the extra. The pump is self-venting. A disadvantage is the lack of bleed screw also means that if the shaft seizes, you have to dismantle as there is no way of inserting a screwdriver into the end of the shaft to rotate it. The wired plug is good as it means you can position the pump as desired and then just connect the plug instead of having to either wire first and plumb around the wires, or plumb first and then hope you can still get into the terminal box. The pump is reasonably quiet, but no quieter than my 16-years-old one. It uses less electricity, but this model does not show the power consumption in use like the AUTO model does. In the event, I decided I could mend my old circulator - all was wrong was the speed selector was stuck on the wrong setting, so I took my new pump off again and re-instated the old one. Still stuck, but now it's on the right setting. Thinking I'll set this Alpha up on a workbench and see how it behaves: it'll be a learning (pump) curve...
Date published: 2016-02-18
Rated 4 out of 5 by from Silence is Golden! Our old pump failed & within a couple of hours I had purchased this off the shelf & fitted as a direct replacement for the old one - no pipework changes needed! Seems to be a top quality item & is so very, very quiet compared to the old one. Not sure how I can rate reliability after two days...ask me in a decade!
Date published: 2015-11-12
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