Browse store

Grundfos Alpha 2L 15-50 (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
  • 5 Year Manufacturer's Guarantee
  • 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

More Info

£99.99INC VAT

Add to basket for...

Grundfos Alpha 2L 15-50 is rated 4.6 out of 5 by 8.
  • y_2017, m_3, d_21, h_24
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_8
  • loc_en_GB, sid_55237, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix

Add to saved list...

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
  • y_2017, m_3, d_21, h_24
  • bvseo_bulk, prod_bvrr, vn_bulk_1.0.0
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_8
  • loc_en_GB, sid_55237, prod, sort_[SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix


Can I leave the body of an UPS2 in place and just install the pump head of the Alpha 2 on to it, they appear to have the same body
Asked by: Ianj8793

Hi does this increase the pressure of the dhw as well as central heating return and flow? I need to increase pressure in about 9 kitchen taps and 15 rads (optional) The showers are electric and fine.

Asked by: Abzaa
  • y_2017, m_3, d_20, h_19CST
  • bvseo_bulk, prod_bvqa, vn_bulk_1.0.0
  • cp_1, bvpage1
  • co_hasquestions, tq_2
  • loc_en_GB, sid_55237, prod, sort_[SortEntry(order=LOCALE, direction=DESCENDING), SortEntry(order=FEATURED, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_screwfix
Brand Grundfos
Central Heating Pump Product Type Domestic Pumps
Connection Type 1½" BSP Connection
IP Rating IP42
Manufacturer Guarantee 2 Year Manufacturer's Guarantee (T&Cs Apply)
Max Pump Head Size 5 m
Model No Alpha 2L 15-50
Pack Size 1
Pieces in Pack/Case 1
Power Output (Watts/Kw) 0.032 kW
Power Voltage Supply 230 V
Product Type Heating Pump
Temperature Range 2 to 110 °C
Total Product Weight 1.9 kg

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.

Product contents

Pump, gaskets, mains plug, installation instructions.