Replacement heating pump

[sadbaxi]

Hi there,

My heating pump has stopped working. I'm not 100% sure what to replace it with as the model is discontinued, I'm looking here:

https://www.screwfix.com/c/heating-plumbing/pumps/cat5170016

Any suggestions as to best replacement?

Here is a pic of the current model:

 

[oldbutnotdead]

First thing-is the pump actually goosed or is it just lacking electricity? Have you tried spinning the impeller with it powered up? (Undo that big shiny screw- it'll drip a bit- then try turning the end of the shaft you've exposed)
After that, you could do with finding what head that pump will drive, then pick a new one the same size that'll mount vertically and drive the same head.

 

[sadbaxi]

Thanks for your reply, no haven't tried spinning the impeller. I have had a multimeter on it and confirm that it's receiving power, but aside from slight buzzing there's no sign of life. I'll have to try the impeller spinning, thanks. How do you find out what head the pump is driving?
Thanks in advance!

 

[ianmcd]

once you remove the large screw head you can use a screwdiver to free the shaft , with the power on you will know immediately if you have freed it off

 

[oldbuffer]

If it's buzzing AND getting hot, its likely the capacitor has gone.

 

[oilhead]

If it's buzzing AND getting hot, its likely the capacitor has gone.

Or there is some crud jamming the impeller. Try a firm tap on the pump body with the shaft of a hammer.

 

[sadbaxi]

Thanks folks, I'll give it a try and keep you posted.

In the event of complete pump failure/seizure would it swap out with this one:
https://www.screwfix.com/p/wilo-yonos-pico-25-1-5-130-glandless-circulating-pump-230v/3080x

 

[FiremanT]

If it's buzzing AND getting hot, its likely the capacitor has gone.

Really?

 

[oldbutnotdead]

Thanks folks, I'll give it a try and keep you posted.

In the event of complete pump failure/seizure would it swap out with this one:
https://www.screwfix.com/p/wilo-yonos-pico-25-1-5-130-glandless-circulating-pump-230v/3080x

Measure your old pump- if it is 130mm from flange to flange then that one will fit. The electrical connection box might overhang one of the isolating valves

 

[ianmcd]

you can use any 130 pump, that as said by @oldbutnotdead is the physical distance between the ports, they are all the same thread and all the same wiring, my individual preference is Grundfoss but that is just me, there are many makes available but your replacement is likely to be ERP which means variable speed, supposedly more efficient, personally I hate them, Wilo are pretty poor, but as advised earlier try freeing the shaft off with a screwdriver , once freed they can run for years

 

[stem]

Just a tip by way of a warning. If you do need to replace it, I replaced my pump last year but unfortunately one of the isolation valves hadn't closed properly. So when I released the pump, water gushed out at an alarming rate, I tried to re tighten the connection to stop it, but because I had disturbed the seal, water still sprayed out in all directions. I tried to grab a bucket and catch what I could, ably assisted by Mrs Stem who was alerted by my cries for help! However, despite catching a few gallons between us, we still sustained damage to both the lounge and dining room ceilings below

So, thought you should be aware. Just in case. I plan to drain the system down to the level of the pump next time.

 

[FiremanT]

once you remove the large screw head you can use a screwdiver to free the shaft , with the power on you will know immediately if you have freed it off

Just be aware that, from old experience, Wilos used to tend to squirt water when removing the big screw.

 

[ollski]

Bungs stem...always bung. Have a spare new isolation valve and a rubble bag on hand just in case of the worst. 9/10 fail to hold. I used to work with a guy who snatched every pump head in a rubble bag...especially stores

 

[sadbaxi]

Thank you all so much for your help with this what great feedback, thanks for taking the time. An update: I removed the screw, turned the impeller (with power off to start with), it didn't seem jammed but the water that dripped out as I did was dirty, once power was applied it whirred away and started working again. It seems a little slow warm up overall but it is getting warm so maybe some air is in the system? The boiler is happy again and there is warmth so that's a good start!!

 

[ianmcd]

the pump was seized it wasnt air