grundfos

Grundfos (Danish pronunciation: [ˈkʁɔnˀfʌs]) is the largest pump manufacturer in the world, based in Denmark, with more than 19,000 employees globally.
The annual production of more than 16 million pump units, circulator pumps (UP), submersible pumps (SP), and centrifugal pumps (CR). Grundfos also produces electric motors for the pumps as well as electric motors for separate merchandising. Grundfos develops and sells electronics for controls for pumps and other systems.

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  1. T

    Grundfos UPS2 for UPS3

    I have a Grundfos UPS2 fitted and its become very loud humming when heating comes on, airing cupboard outside bedroom so not ideal It stops after 15mins as the waters warmed up so my thinking is the pumps on its way out? When fitting the Grundfos UPS3 are people leaving it on the factory...
    • Tom5099
    • Thread
    • america grundfos usa
    • Replies: 7
    • Forum: USA
  2. H

    Weird noise coming from Grundfos macerator

    Hey guys, hope you're all good My macerator is making a strange noise which is hard describe so below is a link to a video to make it easier to understand the noise. You can hear the noise at around 10 seconds! I've checked inside the tank and assessed the motor and everything seems clear. The...
    • hsadat
    • Thread
    • america coming grundfos macerator noise usa weird
    • Replies: 2
    • Forum: USA
  3. M

    Grundfos UPS2 15-50/60 circulating pump problem

    Hi, I'm new to this forum so I hope I've posted this in the right place. I installed a Grundfos UPS2 15-50/60 (part number 98334549) circulating pump into my oil fired central heating system 4 years ago. Recently on the boiler firing up the pump has not started, there is an intermittent...
  4. O

    Replace grundfos with lowara

    I’ve got an old grundfos 15-60 130 selectric that’s getting replaced as it’s on the fritz. I have had lowara ecocirc pumps fitted for ufh on all 4 floors and think they are great. I would like to replace the grundfos with a lowara ecocirc as well. Would a 25-6 130 work in this case. thanks...
  5. I

    Grundfos UPS3 Pump Modes

    Just had a Grundfos UPS3 installed, replacing old UPS. Working well, but I wish to understand a little bit more about the Proportional Pressure (PP) mode If I run it in Constant Curve (or Speed) mode, CH & HW are fine, pump running. If I go to PP mode CH & HW outputs are still fine. BUT, the...
  6. D

    Pump replacement For Celsia pump

    Got a celsia pump think it’s myson/potterton sounds like it’s on way out don’t think u can bleed it either . spoke to anchor pumps recommends grundfos ups2 15/50/60 whats difference compared to ups 3 15/50/65 the ups 2 is a bit pricy would u recommend it also under pump is gate Valve small bit...
    • Dicanio27
    • Thread
    • america grundfos pump pump replacement pumps replacement usa
    • Replies: 0
    • Forum: USA
  7. H

    Grundfos macerator runs for a long time to flush waste

    Hi all I own a Grundfos Sololift 2 and today today the macerator has been behaving odd. It seems to run for a long time (at least a minute) to flush the waste after I used the toilet. Also it has become very sensitive and even turns on more often when I run the tap. I'm wondering if you guys...
    • hsadat
    • Thread
    • america flush grundfos macerator time usa waste
    • Replies: 32
    • Forum: USA
  8. M

    Dab or grundfos pumps

    Is there much difference between the two makes with looking at a domestic central heating pump. Thanks
    • Matt0029
    • Thread
    • america dab grundfos pumps usa
    • Replies: 21
    • Forum: USA
  9. B

    Pressure Relief Valve Overflowing & Grundfos MQ Pump pressure

    I have a Grundfos MQ series domestic pump and it has started cycling on and off. The pressure at the outlet reaches approx 2 bar of pressure and the pump shuts off. The pressure then immediately drops as it overflows out of the Pressure Relief valve. Once the pressure gets to 1.5 bar the pump...
    • Blackrock63
    • Thread
    • america grundfos overflowing pressure pressure relief valve prv pump relief urgent usa valve
    • Replies: 1
    • Forum: USA
  10. O

    Double Grundfos Pumps?

    I've noticed my downstairs radiators haven't been coming on this week (I know- it's august- this is for drying clothes!). I'll check the motors are running after work tonight and bleed the rads, but after looking into the set up of my airing cupboard, which as you can see from the picture is a...
    • OllieC84
    • Thread
    • america double grundfos pumps usa
    • Replies: 6
    • Forum: USA
  11. R

    Faulty GRUNDFOS ALPHA2 L 15-60 130 replace with Grundfos Alpha 1 15-50/60

    My GRUNDFOS ALPHA2 L 15-60 has developed a fault and I'm struggling to find a replacement to enable a simple swap. Would the Grundfos Alpha 1 15-50/60 be a suitable alternative? I'm hoping to simply remove the faulty one and install this without having to do any further work! Many thanks in...
    • RainbowClark
    • Thread
    • alpha america faulty grundfos replace usa
    • Replies: 2
    • Forum: USA
  12. K

    Noisy grundfos pump central heating

    Hi My pump has started making a loud rattling noise. I’ve undone the screw at the front and no air escaped! Any ideas would be most welcome thanks
    • Katemag
    • Thread
    • america central central heating central heating system grundfos heating noisy pump usa
    • Replies: 6
    • Forum: USA
  13. V

    Grundfos Alpha2 15-60 130

    The above pump is showing all of it's lights on screen and is flickering without the pump actually working. The boiler also seems to not be firing up as it should making a lot of noise when it does try to (or at least the pipes above it do). Is this a pump issue or a boiler one? Thanks for any...
    • Vik123
    • Thread
    • america grundfos usa
    • Replies: 12
    • Forum: USA
  14. M

    Grundfos Alpha 2 AutoAdapt is slow

    Hi folks be glad of some help with this as its puzzling me.🤔 I have an Alpha 2 15-60-130 pump serving 12 Rads with thermo valves and Hot Water cylinder. The boiler is an Alpha CD18R Since I had another rad installed downstairs I've noticed the heating pump has been noisier than usual ie...
  15. B

    Can I have the central heating on even though the grundfos water booster has packed in?

    As per title I have a water booster and it is now broken but I am not sure I can have heating on as it may be topped up by the booster. The booster was for taps and 2 power showers so no no showers and only a trickle from cold less from the hot. Its an oil fired CH system with a condensing...
    • bomitie
    • Thread
    • america booster central central heating central heating system grundfos heating though urgent usa water
    • Replies: 3
    • Forum: USA
  16. O

    Grundfos water circulator not circulating

    Hi, I have a Grundfos UP15 42RUC7 circulator which doesn't appear to be working. the impeller moves freely when I spin it manually but when there is power tot he device all I hear is humming but the impeller doesn't turn even though it does not appear to be stuck. Also, oddly I can not find my...
  17. U

    Grundfos UPM3 15-60 azj on Baxi Duo Tec Combi 40 ERP

    I have an intermittent high pitched whine on a boiler of just over 2 years old (which I think is the pump). I can't seem to find a direct replacement and in any event is there another better alternative ?
    • upm3
    • Thread
    • america baxi combi grundfos usa
    • Replies: 1
    • Forum: USA
  18. J

    Problem with new Grundfos UPS

    Hello everyone, I have a problem, to which there is probably a simple solution but I can't see the wood for the trees. I swapped out an old Grundfos pump for the new one. Gone is the lovely old silver button on the front where you can bleed the pump and now we have more bells and whistles. But...
  19. B

    Grundfos UPS3 - Central Heating Pump

    When a pump is switched off does circulating water stop immediately? In other words, is there a bypass within in the pump to allow the water to slow down to a stop? Thanks for any advice
  20. moonlight

    Grundfos Ups 3 16/50 exchange

    I haven't had call to this yet but there might be a first coming up. Will I be able to swap the head on a ups2 pump for a ups3 pump head?
    • moonlight
    • Thread
    • america grundfos usa
    • Replies: 5
    • Forum: USA

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