My pump has got noisy, it's 35 years old. I propose to replace it.
I'm wary of circulator pumps in the £20-£40 range. Has anybody tried the CBS Intel 15-60 130, about £70, which claims to be A rated [Though it seems odd to worry about 50 watts when you are burning 20 kilowatts of gas.]
The Grundfos competitor seems very expensive, but I expect it's better.
-- Take the dog out to email
our original Grundfos lasted from 1988 until last year. A good life.
I replaced mine during the summer with a DAB Evosta (£80 from Toolstation) and am well satisfied with it
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You can run it as a conventional 3 fixed speed pump or as differential pressure proportional speed (6 modes)
Instruction manual (in multiple languages per page)
BTW, the wiring connector unplugs on these pumps which may not be obvious when you get the pump out of the box. The watertight cable strain relief slides out allowing you to wire up the plug part of the connector and then slide the whole assembly back.
After 35 years the values either side of your pump may no longer work - or leak once turned back on so possibly make provision for a new set of valves and/or draining down the system to a level where you can replace the pump. While the pump may be the same length don't assume a new valve set is the same length as the old.
Stick with Grundfos. Costs more, but they work.
You can get ones with variable speed (manual or auto) - the manual is useful as you can set it just high enough to do the job, but minimise the noise.
I nearly replaced our 30 year-old Grundfos last year. But after I opened it up and scraped all the black crust out, I just put it back. It's quiet and happy again now.
Sadly, someone who came to flush our system, put it back with the shaft at an angle. The bearings didn't like it.
Surprising. My Grundfos pump lasted about 30 years and the shaft was deliberately set not to be horizontal as per the instructions. Undoing the large nuts was very difficult. Job for the vice.
Yes, the shaft must be horizontal or slope downwards away from the pipework, to ensure the bearing is full of water and not in an air pocket. Water is the lubricant.
NT
A few months ago when the weather started to get cold I noticed that our old Wilo pump was noisy and not pumping very well so the boiler was cycling on and off rather a lot. So I replaced it with a Grundfos Alpha2 L 15-60. It is much quieter and pumps very well even on an intermediate setting. Afterwards I was able to take apart the Wilo pump and found that the slots in its rotor were pretty much gunged up with black scale-like stuff. My guess is that this affected the performance quite a bit, so maybe it didn't really need to be replaced. So I'd recommend Grundfos over Wilo, but it might be worth taking your old pump apart, if you can, to de-coke it first.
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