I need to fit a radiator before the pump on my gas central heating
system.

Is it feasible ????

or do I need to reposition pump ???

In article ,
stevesmith wrote:
I need to fit a radiator before the pump on my gas central heating
system.

Is it feasible ????

Yup.

or do I need to reposition pump ???

The pump could be situated anywhere in the circuit.

--
*Speak softly and carry a cellular phone *

Dave Plowman London SW
To e-mail, change noise into sound.

In an earlier contribution to this discussion,
Dave Plowman (News) wrote:

In article ,
stevesmith wrote:
I need to fit a radiator before the pump on my gas central heating
system.

Is it feasible ????

Yup.


Are you sure??


or do I need to reposition pump ???

The pump could be situated anywhere in the circuit.

Yes, but it isn't really a circuit is it, unless it's a one pipe system.
Conventionally, all the radiators are connected in parallel - taking their
feed from the flow pipe *after* the pump, and with their returns all
connected into the boiler return pipe.

If you take a feed for one radiator *before* the pump, where do you connect
its return? If you common this with all the other returns, you'll get
virtually no flow through this rad because both sides will be at the same
pressure. You *certainly* don't want to connect it in series with the flow
pipe so that *all* the flow for the entire system goes through this single
rad. One possibility may be to connect both the rad's flow and return pipes
into the system flow pipe before the boiler - so that this bit of the system
would effectively be a one-pipe affair. But it's pretty non-standard!
--
Cheers,
Roger
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On Sat, 23 Dec 2006 10:31:58 +0000, stevesmith wrote:

I need to fit a radiator before the pump on my gas central heating
system.

Is it feasible ????

or do I need to reposition pump ???

I think you need to give a bit more back ground info.

Why do you need to connect the radiator in this position?
What is the radiator intended to do?

There is no way (i can think of) that such an arrangement would lead to a
correct installation.



--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards

I think you need to give a bit more back ground info.

Why do you need to connect the radiator in this position?
What is the radiator intended to do?


I have a rear ground floor extension, that does not have any radiators
in it. It worked out that the existing rads in the open plan kitchen
and dinning room were adequate. But it does get very cold at the
furthest places away from the rads.

A new gas boiler is located in the extension, the pump is in the
ceiling of the kitchen. Space does make it easy to move the pump
closer to the boiler.

There is no way (i can think of) that such an arrangement would lead to a
correct installation.

The return pipe would be easy to T into, but its getting the flow pipe
that is the problem.

I'm thinking along the lines of 10mm microbore.

"stevesmith" wrote in message
...

I think you need to give a bit more back ground info.

Why do you need to connect the radiator in this position?
What is the radiator intended to do?


I have a rear ground floor extension, that does not have any radiators
in it. It worked out that the existing rads in the open plan kitchen
and dinning room were adequate. But it does get very cold at the
furthest places away from the rads.

A new gas boiler is located in the extension, the pump is in the
ceiling of the kitchen. Space does make it easy to move the pump
closer to the boiler.

There is no way (i can think of) that such an arrangement would lead to a
correct installation.

The return pipe would be easy to T into, but its getting the flow pipe
that is the problem.



Maybe if the flow from the boiler is connected to the top of the radiator and
the return to the boiler is connected to the bottom of the radiator you might
get some natural (gravity) circulation. The tappings for the radiator would need
to be as close to the boiler as possible. (i.e. like a gravity H/W tank)

Then again if the radiaor tappings were a long way from the boiler, the pump
would force some water to go through the radiator rather than the boiler this
would warm the radiator but reduce the effectiveness of the whole system.



I'm thinking along the lines of 10mm microbore.


My inclination would be to use a larger diameter pipe if you would be relying on
natural ciculation.


--

Michael Chare

In an earlier contribution to this discussion,
Michael Chare wrote:


Maybe if the flow from the boiler is connected to the top of the
radiator and the return to the boiler is connected to the bottom of
the radiator you might get some natural (gravity) circulation. The
tappings for the radiator would need to be as close to the boiler as
possible. (i.e. like a gravity H/W tank)

Not with microbore pipe!

It's no use frigging about - but far better to move the pump nearer to the
boiler. The rad tapping can then be *after* the pump - and it will work
fine.
--
Cheers,
Roger
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