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Upgrading a Pump, RPM a factor?

  • 19-12-2012 5:01pm
    #1
    NobodyImportant
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭


    Hi All,

    I have a surepump 55/130 which is probably the best part of 20 years old. Its a long run for a system and with high ceilings, the second floor is higher than normal. Some rads are a bit clogged and with normal pressure they arent heating up properly, but with other rads switched off they heat up fine.

    So I'm going for a new pump and want to upgrade the pressure from what i have.

    Question is, the current pump runs at 2330rpm, whereas this Grundfos 15/60 which pumps to 6 metres and has great reviews, only has 1750 Rpm as a maximum.

    http://www.oilybits.com/grundfos-ups-15-60-super-selectric-central-heating-circulator-pump/prod_647.html

    So has the RPM got much to do with it? Could the 1750 Grundfos pump more than the surepump with 2330 rpm? Am i looking at the wrong thing to judge a pump by?

    Thanks for all advise.


Comments

  • #2
    corkgsxr
    Registered Users, Registered Users 2 Posts: 3,404 ✭✭✭corkgsxr


    Could be a bigger impeller at lower revs

    Grundfos are very good pumps


  • #3
    cikearney
    Registered Users, Registered Users 2 Posts: 226 ✭✭cikearney


    NobodyImportant wrote: »
    Hi All,

    I have a surepump 55/130 which is probably the best part of 20 years old. Its a long run for a system and with high ceilings, the second floor is higher than normal. Some rads are a bit clogged and with normal pressure they arent heating up properly, but with other rads switched off they heat up fine.

    So I'm going for a new pump and want to upgrade the pressure from what i have.

    Question is, the current pump runs at 2330rpm, whereas this Grundfos 15/60 which pumps to 6 metres and has great reviews, only has 1750 Rpm as a maximum.

    http://www.oilybits.com/grundfos-ups-15-60-super-selectric-central-heating-circulator-pump/prod_647.html

    So has the RPM got much to do with it? Could the 1750 Grundfos pump more than the surepump with 2330 rpm? Am i looking at the wrong thing to judge a pump by?

    Thanks for all advise.
    Your standard D rated pump is being made obsolete come the new year and being replace with an A rated modulating pump


  • #4
    sky6
    Registered Users, Registered Users 2 Posts: 1,444 ✭✭✭sky6


    Modern pumps are much more efficient in every way possible but a simple phone call to Grundfos Technical in Ballymount dublin will answer any fears and questions you have.
    I would also suggest a proper chemical power flush of your system before you spend money on a new pump.


  • #5
    NobodyImportant
    Registered Users, Registered Users 2 Posts: 585 ✭✭✭NobodyImportant


    Thanks, had a powerflush back in February, so it should be pretty good by now.

    @CiKearney, thanks for the heads up, but i might stick with the older manual one. The new ones are 'Smart' and slow down and speed up (not sure how it works this out) and I know i have 4 underperforming radiators that need full blast.


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