Life of ch pumps?
As a result of this thread http://tinyurl.com/8um67 we eventually
replaced the pump with a Grundfos (and wired in a permanent live to allow pump overrun) 25/55. We bought it last spring and it was finally fitted around October. Now, barely a year after being installed, it has failed. Grundfos give 18months warranty from date of manufacture and ours is now outside that. This doesnt seem a reasonable life for a pump to me - any advice? |
Life of ch pumps?
wrote: As a result of this thread http://tinyurl.com/8um67 we eventually replaced the pump with a Grundfos (and wired in a permanent live to allow pump overrun) 25/55. We bought it last spring and it was finally fitted around October. Now, barely a year after being installed, it has failed. Grundfos give 18months warranty from date of manufacture and ours is now outside that. This doesnt seem a reasonable life for a pump to me - any advice? I fitted a Myson dual speed with a variable mechanical vane in 1983. It is still rotating as I type. It is in a solid fuel system where the pump is usually on for 24 hours a day. Chris. |
Life of ch pumps?
wrote in message ups.com... As a result of this thread http://tinyurl.com/8um67 we eventually replaced the pump with a Grundfos (and wired in a permanent live to allow pump overrun) 25/55. We bought it last spring and it was finally fitted around October. Now, barely a year after being installed, it has failed. Grundfos give 18months warranty from date of manufacture and ours is now outside that. This doesnt seem a reasonable life for a pump to me - any advice? I'm on my second pump in 30 years, with the second pump giving no sign of impending failure. Having said that the system works on gravity for hot water (no need for pump to run for this purpose) and we do not use the central heating system extensively. Do you have a "clean" system? I would think that the system contaminants would have a considerable effect upon the life of the pump impellor bearings. My system was installed with a corrosion inhibitor immediately after flushing during initial commissioning i.e. it has never run with no corrosion inhibitor. If no inhibitor is present it will only take a few days for a considerable amount of corrosion products to be generated and these will affect the subsequent life of the pump. Against my advice, my brother installed a mild steel radiator on the circuit of a non-closed system, it lasted about 6 weeks before it was holed, thus is the rate of rusting in an un-protected system. My daughter does have a fully pumped system, which has a pump of unknown vintage installed, but it has lasted at least four years, with expectations of further service to come. In answer to your question, the life of your pump does seem rather short. It may be that you are just unlucky, or that there is an explanation along the lines I have suggested to explain it's lack of longevity. On the other hand it may have been an electrical problem, which do occur unpredictably from time to time. Hope this gives you some food for thought Regards Pilgarlick |
Life of ch pumps?
On 8 Nov 2005 05:48:31 -0800, wrote:
| As a result of this thread http://tinyurl.com/8um67 we eventually | replaced the pump with a Grundfos (and wired in a permanent live to | allow pump overrun) 25/55. | | We bought it last spring and it was finally fitted around October. | Now, barely a year after being installed, it has failed. Grundfos give | 18months warranty from date of manufacture and ours is now outside | that. | | This doesnt seem a reasonable life for a pump to me - any advice? Mine lasted 25 years. -- Dave Fawthrop dave hyphenologist co uk Help make Usenet a better place: English is read downwards, please don't top post. Trim replies to quote only relevant text. Check groups.google.com before asking an obvious question. |
Life of ch pumps?
Richard Conway wrote in
: Did you install it in the correct orientation? Most pumps require the shaft to be horizontal. I know that's true; but I just took out a Grundfos that's still working perfectly after 10 years in the wrong orientation, there was nowt wrong with it, I just wanted a "smart" one. Gawg knows why, the old dumb one was smarter than me. Anyhow, I;m keeping it as a spare mike |
Life of ch pumps?
On 8 Nov 2005 05:48:31 -0800, wrote:
As a result of this thread http://tinyurl.com/8um67 we eventually replaced the pump with a Grundfos (and wired in a permanent live to allow pump overrun) 25/55. We bought it last spring and it was finally fitted around October. Now, barely a year after being installed, it has failed. Grundfos give 18months warranty from date of manufacture and ours is now outside that. This doesnt seem a reasonable life for a pump to me - any advice? I changed mine twice, both times sticking with the original horizontal shaft before twisting the latest one so the shaft now rises at 45 degrees. I've had no further problems. Andy |
Quote:
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Life of ch pumps?
pretended :
As a result of this thread http://tinyurl.com/8um67 we eventually replaced the pump with a Grundfos (and wired in a permanent live to allow pump overrun) 25/55. We bought it last spring and it was finally fitted around October. Now, barely a year after being installed, it has failed. Grundfos give 18months warranty from date of manufacture and ours is now outside that. This doesnt seem a reasonable life for a pump to me - any advice? Initial pump failed, or rather became noisy after six months. Second one has run for 18 years in intermitant use 24/7/365. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
Life of ch pumps?
In message , gastec
writes the life expectency of a new pump is around 5 years...obviously some folks get +10 years......the old commodor pumps amazingly seem to want to outlive myself...im 35 ..old pump quality is vastly better than the new....in Scotland Grunfoss is recognised as the best type of pump....England with its Hard Water areas i believe are having problems with grunfoss ????Its probable that youve just been unlucky..... Seeing as the water in a CH system is basically the same water circulating round (allowing for the odd bit of topping up) I can't see the hardness of the water should be any sort of issue BTW, you '.' key seems to be sticking. -- Chris French |
Life of ch pumps?
Harry Bloomfield wrote:
intermitant use 24/7/365. eh? |
Life of ch pumps?
Richard Conway wrote:
Harry Bloomfield wrote: intermitant use 24/7/365. eh? He means "intermittent use". The number gubbins isn't relevant. |
Life of ch pumps?
wrote:
As a result of this thread http://tinyurl.com/8um67 we eventually replaced the pump with a Grundfos (and wired in a permanent live to allow pump overrun) 25/55. We bought it last spring and it was finally fitted around October. Now, barely a year after being installed, it has failed. Grundfos give 18months warranty from date of manufacture and ours is now outside that. This doesnt seem a reasonable life for a pump to me - any advice? What went wrong with it? Mechanical or Electrical? I've seen a pretty new Grundfos selectric which spun OK mechanically (if you turned it by hand) but was electrically dead. Maybe they had[1] some QC problems? [1] hope the past tense is correct :-) |
Life of ch pumps?
That sounds like it might be the problem. I think Grundfos are going
to take it back for inspection. |
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