On Wed, 02 Jan 2008 13:49:36 +0000, Doctor Drivel wrote:

"Andy Hall" wrote in message
news:477b6af4@qaanaaq...
On 2008-01-02 10:01:02 +0000, "Doctor Drivel" said:


"Andy Hall" wrote in message
news:477ae429@qaanaaq...
On 2008-01-02 00:10:15 +0000, "Doctor Drivel"
said:


"John Stumbles" wrote in message
...
On Sat, 29 Dec 2007 14:50:18 +0000, Doctor Drivel wrote:

"John Stumbles" wrote
http://www.gas-news.co.uk/archive/st...mment/1006.htm

The Giannoni heat exchangers:
http://www.giannoni.fr/Prod-ABSOLUT-CONDENS.html

That's just a product brochu it doesn't answer the concerns and
criticisms raised in the GN article.

Giannoni are a well respected company. Their heat Xs are in
Vaillants, Broags, Glow Worms and many others. They are a quality
product with a good reputation. If the system is installed
properly, and with a Magnaclean, then there is little chance of
sludge build up in the heat X.

If the system is installed and maintained properly, there is no need
for a
Magnaclean because there is no sludge.

The article was on about poorly maintained system and that this could
lead
to these heat exchangers being blocked as a result. A Magnaclean will
prevent the problem occurring.

Cleaning and then maintaining the system properly will prevent the
sludging, not only protecting the heat exchanger but also extending the
life of the radiators.

Using a Magnaclean is like putting Elastoplast on a broken leg.

Total tripe!!! It prevents sludge build up. And is a guarantee
against poor to no maintenance. Say this should be done and that should
be done indices total naivety of the real world.

The only way a sealed system is going to sludge up is if the user adds
water daily for many months. As you say in the real world that happens,
quite often. There is little I can do about that.

One thing is clear the extra cost of installing a Magnaclean achieves
what? It won't stop the system having to be cleaned as part of the
repair. If it makes any impact on keeping the system running any longer
then one effect would be to prolong the damage to the system.

I can see a possible use for a Magnaclean.

Imagine a very large system (say something like C19 church hall or a
small school), with enormous high water content radiators and pipework.
You need to replace the boiler.

A reasonable way of doing this is to keep the old circuit intact and use
a water-water heat exchanger coupled to the new C21 boiler (with sealed
primary and inhibitor). A Magnaclean would be very useful to keep the old
vented secondary side of the heat exchanger clear of bits.

--
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