Which is best - running a central heating pump at its fastest or
slowest speed setting?
--
Hugo Nebula
'What you have to ask yourself is, "if no-one on the internet wants
a piece of this, just how far from the pack have you strayed?"'

On Tue, 14 Dec 2004 23:46:12 +0000, Hugo Nebula abuse@localhost
strung together this:

Which is best - running a central heating pump at its fastest or
slowest speed setting?

Depends, there's a setup process involved. Generally faster for bigger
systems, but run it so it works and it's quiet.
--

SJW
Please reply to group or use 'usenet' in email subject

In message , Lurch
wrote
On Tue, 14 Dec 2004 23:46:12 +0000, Hugo Nebula abuse@localhost
strung together this:

Which is best - running a central heating pump at its fastest or
slowest speed setting?

Depends, there's a setup process involved. Generally faster for bigger
systems, but run it so it works and it's quiet.


Depending on your system, make sure the faster speeds are not pumping
hot water into the header tank.
--
Alan

On Wed, 15 Dec 2004 00:27:40 +0000, Alan
strung together this:

Depending on your system, make sure the faster speeds are not pumping
hot water into the header tank.

Thanks but the pump in my combi is set perfectly. If I have any
problems withh pump speed I'll be sure to ask though.
--

SJW
Please reply to group or use 'usenet' in email subject

In an earlier contribution to this discussion,
Hugo Nebula abuse@localhost wrote:

Which is best - running a central heating pump at its fastest or
slowest speed setting?


Run it at the lowest speed which gives an adequate performance. With a
conventional boiler, this would imply an 11 degC drop across all radiators
when they are correctly balanced.
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

"Set Square" wrote in message
...
In an earlier contribution to this discussion,
Hugo Nebula abuse@localhost wrote:

Which is best - running a central heating pump at its fastest or
slowest speed setting?


Run it at the lowest speed which gives an adequate performance. With a
conventional boiler, this would imply an 11 degC drop across all radiators
when they are correctly balanced.

Misadvise. You run it to what the balance procedure dictates.

In an earlier contribution to this discussion,
IMM wrote:

"Set Square" wrote in message
...

Run it at the lowest speed which gives an adequate performance. With
a conventional boiler, this would imply an 11 degC drop across all
radiators when they are correctly balanced.

Misadvise. You run it to what the balance procedure dictates.

Haven't seen you for a bit. I was begininning to think that you'd taken the
advice you offered to me - and topped yourself!

Since you *are* still around, please explain in words of one syllable how my
advice gives a different result from following the balancing procedure.
--
Cheers,
Set Square
______
Please reply to newsgroup. Reply address is invalid.

"Set Square" wrote in message
...
In an earlier contribution to this discussion,
IMM wrote:

"Set Square" wrote in message
...

Run it at the lowest speed which gives an adequate performance. With
a conventional boiler, this would imply an 11 degC drop across all
radiators when they are correctly balanced.

Misadvise. You run it to what the balance procedure dictates.

Haven't seen you for a bit. I was begininning to think that you'd taken
the
advice you offered to me - and topped yourself!

Since you *are* still around, please explain in words of one syllable how
my
advice gives a different result from following the balancing procedure.

I repeat...."You run it to what the balance procedure dictates".

The message
from "IMM" contains these words:

I repeat...."You run it to what the balance procedure dictates".

Why don't you answer the question? You can't of course which is why you
answer anything that baffles you with obfuscation.

--
Roger

On Tue, 14 Dec 2004 23:46:12 +0000, Hugo Nebula abuse@localhost
wrote:

Which is best - running a central heating pump at its fastest or
slowest speed setting?

The right speed. Boilers are designed for 80C out, 70C back, a 10C
drop. Radiators are designed for 75C average temperature.

To fast and boiler drop is 10C giving reduced efficiency as the lower
the water temperature the more energy taken from the hot gases.
Radiator temperature is higher making them give out more that their
rating.

To slow and boiler drop is 10C. Efficiency is higher but 55C and
you run the risk of condensation and rust in the boiler heat
exchanger. Radiator temperature is lower so their output is less.

The 80C is the turn off temperature so that the fixed value so
increase drop across the boiler works back from that. For example,
20C drop, is 80C out, 60C back, radiator temp 70C.

All the above ASSUMES conventional boiler. Condensers like a low
return temp as that helps them condense. For them 55C return is good
so you have a lower radiator temperature and lower radiator output and
hence condensers need larger radiators (if they are to condense all
season).


--

Malcolm

Malcolm Reeves BSc CEng MIEE MIRSE, Full Circuit Ltd, Chippenham, UK
, or ).
Design Service for Analogue/Digital H/W & S/W Railway Signalling and Power
electronics. More details plus freeware, Win95/98 DUN and Pspice tips, see:

http://www.fullcircuit.com or http://www.fullcircuit.co.uk

NEW - www.CharteredConsultant.co.uk - The Consultant A-List