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DeltaT2
It's amazing how the so-called experts on here can't work out circulation pump head or duty................ 
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- Thread starter Rickf29
- Start date
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DeltaT2
Sorry Alec1, in most cases you know your onions, but you're completely wrong to suggest a change of circulation pump will sort it all out.
Rick son, you need to start with the basics, boiler size, pipe sizing, then & only then consider the CIRCULATION pump.
Any sealed Central Heating system works like the Big Wheel in the Fair Ground, if the circulation pump can lift water to the top of the wheel, gravity helps bring it back down again.
Sketch it all out Rick & properly 'pipe size' it, remembering things like a 15mm pipe can carry up to 4.9KW on a 11°C Delta T & allmost double that on a 20C Delta T...............
Don't make the classic mistake of confusing 'head' with flow rate, like many on here do!!!
It's amazing how the so-called experts on here can't work out circulation pump head or duty................
Others here hide their true identity and make their profiles hidden!
Tony
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DeltaT2
It's amazing how the so-called experts on here can't work out circulation pump head or duty................
Others here hide their true identity and make their profiles hidden!
Tony
Anyone should get access to my profile Tony?? But hey I don't know what the Forum Polis are up too mate...........
Mind you, there's very little to see on my profile??!!............
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gaswizzard
It gets tiresome Alec , you ask this time and time again , KW rating has nothing whatsoever to do with circulator head , a 24 kw boiler with undersized pipework may well require a head in excess of 6 metres whereas a 100 kw boiler may only require a 2 metre head circulator/pump.
Some 24 kw boilers require a 2 metre head to overcome hex resistance whereas the old cast iron jobbies (200 kw) only required .5 metre head to overcome RESISTANCE , can you see where this is going?
It's amazing how the so-called experts on here can't work out circulation pump head or duty................
and i guess we're supposed to believe you can? dont see you giving any helpful advice.
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It's amazing how the so-called experts on here can't work out circulation pump head or duty................
Others here hide their true identity and make their profiles hidden!
Tony
Others here work when they are not registered. Which is the worst scenario?
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gaswizzard
Really! , me not think so.
, total resistance needs to be taken into acount and not just to the top of the wheel. 
Nope. .145 x 11 x 4.2 = 6.7 kw.
, you gotta know your onions delta.
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DeltaT2
Really! , me not think so.
Nope. .145 x 11 x 4.2 = 6.7 kw.
Sorry mate that was for Pex, you're correct for copper tube.
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DeltaT2
Really! , me not think so.
Nope. .145 x 11 x 4.2 = 6.7 kw.
Also, don't forget your Index circuit!!
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gaswizzard
PEX tube! , quoting load limits for copper tube should be second nature for an old hand like you Delta , no excuses.
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