Grundfos two-speed Super 4 is dying - Help!

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Can anybody give me some advice about my central heating pump - It's on it's last legs & will now only run on it's high speed setting. It makes an awful noise - clattering and "Kettling" and has simply stopped on a couple of occasions over the last few days. It is a Grundfos two-speed Super 4 pump, type: 4.50/130, 2500rpm,105W, class 4, if that helps. I think it's a fairly old model. If it needs replacing, would a UPS 15/50 or 15/60 be suitable? Any advice v. gratefully received - s'not all that warm, these days!

 

[Agile]

Clearly your pump bearings are very worn and the extra resistance probably means it will only work at the maximum setting.

Unless you have more than about 10 rads then a 15-50 on the setting 2 will easily suffice.

A new pump will cost less to buy than filling a car with petrol.

Tony

 

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Tony,
Many thanks for taking the time to reply to my query, and for your advice. I'll try to obtain a 15-50, as you suggest, and I'll call in a professional to fit it - peace of mind is worth the price.
Cheers,
Tim.