Inadequate Circulator Pump?

[JC22024]

Pretty good difference comparing pump to pump opening

 

[John.g]

Is there much of a build up on the Wilo impeller vanes??. or is that the Alpha?.

 

[ShaunCorbs]

Note it will be brown / black this is normal

 

[John.g]

Here's mine, after 18 years, ready to be reinstalled when my smart pump packs up.

 

[John.g]

The impeller on JCs old (alpha/wilo) looks as if it has been in contact with something metallic as it seems a bit chewed up.

 

[JC22024]

The impeller on JCs old (alpha/wilo) looks as if it has been in contact with something metallic as it seems a bit chewed up.

I tried to split the Grundfos but it was the motor coming apart! So didn't want to break it altogether.

From what I can see the old vane looks OK?

 

[JC22024]

PS regards fitting new pump could the gate valves I have be considered a restriction?



They narrow to 15mm or so at pump inlet. Maybe this is nothing to worry about but If there may be a better way of connecting it let me know.

 

[ShaunCorbs]

No there all the same sorry to say you can pipe straight to the pump but then there’s no valves

 

[JC22024]

Well the new pump appears to be working very well.

Boiler only on 20 mins and already can audibly hear the pipes clicking as they heat up in far room of house! Radiator that never heated is already heating up evenly.

Will let it fully warm up for next hour or so and see how it's doing but appears very promising

 

[John.g]

What pump setting? and what are boiler flow/return temps as flow rate can be calculated from this.