Replacing Grundfos boiler pump head - like for like

[pls1]

Pump is on its way out on a Ferroli Tempra 30 boiler. The pump is a Grundfos 15-50 but looks to be a custom one for Ferroli.

Untitled

• pls1
• 6 Jun 2012
• 1

I've tried googling the part number but can't seem to find a suitable replacement. Since it is just the pump head, can I fit any Grundfos 15-50 pump head?

 

[Boilerman2]

You may have a problem with the electrical connector on the head, from your pic it looks like it may be a plug and socket onto the pump???
why not order a pump head using FERROLI's part number?
however on most of these situations a standard UPS15/50 will do

 

[matt1e]

What do you mean by "on its way out"?
if it is its performance you are on about then its possible that the impeller is fouled up
I would be temped to take the head off first and inspect it, the cable unplugs on that model As Boilerman2 has stated so check that too
but as its ten years old it probably reqs changing anyway I'm not sure if a standard head will go straight on as grundfos can be funny but It will more likely fit than not.

Matt

 

[pls1]

It makes a noise like this!
http://youtu.be/atYhxuN5X_w

I had the pump head off and it was ok, no sludge. Its about 9yrs old.

 

[Agile]

Some 15-50s have slightly different impeller designs.

If you get one with a similar then it can be expected to fit apart from having no socket.

The plug can be cut off and the wire if long enough fitted to the pump inlet connector.

Tony

 

[DeltaT2]

It makes a noise like this!
http://youtu.be/atYhxuN5X_w

I had the pump head off and it was ok, no sludge. Its about 9yrs old.

Take the head off & 'Clean the Can' that'll cure it. There I go again giving away all the Dark Arts.............

A 15-50 circulation pump will last 30-40 years in a clean system.

 

[pls1]

How do you clean the can (or head) ? Isn't it a sealed unit?

 

[petit_pablo]

Standard 15/50 head will fit. The connector plug can be rewired into the new pump

 

[HERTS P&D]

See below:

http://www.youtube.com/watch?v=JW9zJZ6k0zY&list=UUhwPs1xVLtSl6FCMU4i3I_Q&index=7&feature=plcp

Andy

 

[DeltaT2]

See below:

http://www.youtube.com/watch?v=JW9zJZ6k0zY&list=UUhwPs1xVLtSl6FCMU4i3I_Q&index=7&feature=plcp

Andy

Ah yes, there's only one Master Plumber on Youtube, nice one Tom..............

Mind you, on reflection, I would not knock 'Friar Tuck' out of the insides of the circulation pump head with a screwdriver to remove it. I think in the hands of a DaftyDIYer or the hard of thinking, you'd damage the ceramic bit...............
HTH

 

[pls1]

Thanks, that's a useful video and it helped to figure out how to dismantle the head.
What I'm curious about though is why he recommends lubricating the outside of the can before inserting it back into the head? This bit isn't the part which moves, its the bit inside the can which does. Also, are the moving parts inside the can lubricated by water given that the bleed screw appears to bleed water through this assembly once in place?

Mine also moves freely (i.e. it wasn't seized) so could it be the moving parts inside the can are worn?

 

[pls1]

It also doesn't make a noise all the time, just usually when the boiler first kicks into life or when it powers down.