Life of ch pumps?

Did you install it in the correct orientation? Most pumps require the shaft to be horizontal.

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.

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

| As a result of this thread

Mine lasted 25 years.

Richard Conway wrote in news:972cf.36400$ snipped-for-privacy@fe06.highwinds-media.phx:

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

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

the life expectency of a new pump is around 5 years...obviously som folks get +10 years......the old commodor pumps amazingly seem to wan to outlive myself...im 35 ..old pump quality is vastly better than th new....in Scotland Grunfoss is recognised as the best type o pump....England with its Hard Water areas i believe are having problem with grunfoss ????Its probable that youve just been unlucky....

-- gastec

snipped-for-privacy@hotmail.com pretended :

Initial pump failed, or rather became noisy after six months. Second one has run for 18 years in intermitant use 24/7/365.

In message , gastec writes

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.

eh?

He means "intermittent use". The number gubbins isn't relevant.

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?

That sounds like it might be the problem. I think Grundfos are going to take it back for inspection.