Rehan Saeed Posted January 5, 2023 Share Posted January 5, 2023 I'm looking into pumps for an underfloor heating system. I'd like to get one that is as energy efficient as possible but also quiet. I read the guide below: https://www.anchorpumps.com/blog/best-central-heating-pumps-expert-guide/ It seems the Grundfos ALPHA3 15-50/60 is the most energy efficient with an EEI of 0.17 but it's pretty expensive. In second place is the Stuart Turner ST 15/60 with an EEI of 0.18. This one is one third the price of the Grundfos! If looks are anything to go by, it also looks a lot cheaper too. Since the EEI only differs by 0.01, how much of a real world difference does that actually make over the course of a year? Can anyone give me a good recommendation for an energy efficient pump? Link to comment Share on other sites More sharing options...
Nickfromwales Posted January 5, 2023 Share Posted January 5, 2023 https://www.tradepumps.com/grundfos-alpha3?tagrid=55270474 Change of £197 here 1 Link to comment Share on other sites More sharing options...
PeterW Posted January 5, 2023 Share Posted January 5, 2023 Wilo for me - they are near silent. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted January 5, 2023 Share Posted January 5, 2023 42 minutes ago, PeterW said: Wilo for me - they are near silent. Yup. I've started to specify these, but the plugs are shit. Link to comment Share on other sites More sharing options...
Rehan Saeed Posted January 5, 2023 Author Share Posted January 5, 2023 59 minutes ago, PeterW said: Wilo for me - they are near silent. The best efficiency I found for these was 0.20. So not as good but good to know they are good for low noise. Link to comment Share on other sites More sharing options...
dpmiller Posted January 5, 2023 Share Posted January 5, 2023 how many watts of a difference do you think there'll be between two already-efficient pumps? Link to comment Share on other sites More sharing options...
Rehan Saeed Posted January 5, 2023 Author Share Posted January 5, 2023 I found that a pump typically uses about 50W of energy, so I did a bit of rough math and found it costs about £4 per month to run (assuming its run for 8 hours a day, thats or £48 per year or £480 over a ten year lifetime). What I'm unsure of is how an energy efficiency index of 0.17 for a Grudfos or 0.2 for a Wilo affects those numbers. Link to comment Share on other sites More sharing options...
Rehan Saeed Posted January 5, 2023 Author Share Posted January 5, 2023 I found the details. A Wilo Pico power usage: The Grundfos in comparison: The Wilo cost assuming its always at max speed (not true but to get an idea) is £38.16: The Grundfos cost per year is £28.68: The Grundfos will save you £9.48 over a year or £94.80 over ten years by my calculations. Not a huge difference but worth spending £20-£50 extra on a better pump IMO. Link to comment Share on other sites More sharing options...
PeterW Posted January 5, 2023 Share Posted January 5, 2023 1 hour ago, Rehan Saeed said: I found that a pump typically uses about 50W of energy No idea where you’ve got that from - the Wilo Yonos is 17-20W max. That’s £10 per year based on 36p/kWh and 8 hrs day/180 days per year. Your average TV on standby uses about 4 times that… Link to comment Share on other sites More sharing options...
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