Heat bank & boiler connections

[Dan Robinson]

I'm sure he is - but I am not him, as well you know.

And you forgot your let-by test as well.

 

[Norcon]

Water Systems you're a complete tozzer!!!..............

When the argument is lost the insults begin.

 

[Dan Robinson]

Getting you confused isn't much of a challenge. I hear it happens a lot with people your age .

 

[Onetap]

I shall ask you yet another question:

How many people with domestic combination boilers contracted Legionella's disease from said boilers last year? Or any year in fact?

What does your magic book say to do where an instantaneous source of hot water is present?

What a very strange question.

I don't know of any surveys in which incidents of legionella infections contracted from domestic HW systems were divided into storage and instantaneous/combi water heaters.

However, I can absolutely guarantee that people do contract legionnaires' disease from domestic combi boilers. Read P 35 of this;

http://www.who.int/water_sanitation_health/emerging/legionella.pdf

"The presence of biofilms is therefore an important factor for Legionella survival and growth in water systems. Small numbers of legionellae are found in sources such as distributed drinking-water supplies, which then feed into water systems within buildings and cooling towers. This provides a logical explanation for the presence and subsequent growth of legionellae in these artificial aquatic environments."

The process of contamination is the same in most systems;
1) Legionella enters the system, in small numbers, in the mains water supply and;

2) if given favourable conditions of temperature and available nutrients, it will proliferate to hazardous levels.

Why should combi boilers be immune to this process? I know of a case in which a hospital drinking water supply (I believe that means mains, but the report I saw didn't actually state that) became contaminated due to the pipes being warmed by inadequately insulated adjacent hot pipes. This is no different to the situation that could arise with a defective combi system.

What you would like is to have a study showing that mains fed instantaneous water heaters are not susceptible to legionella contamination. You will not find any such data, it does not exist; if it did exist, it would be splashed in big letters all over combi boiler sales literature.

 

[Onetap]

There is an interesting paragraph on P. 36 of the WHO document mentioned above.

"Legionella contamination can originate from small areas of a water system that are not exposed to temperature fluctuations or circulating disinfectant. An example of this occurred in a large teaching hospital in the United Kingdom, where legionellae were intermittently detected at
one sentinel outlet, despite the fact that there was a comprehensive control regime in place.

The source was eventually tracked down to a 10‑centimetre length of water-filled pipe where there was little or no flow (a “deadleg”). When this section of pipe was removed, subsequent sampling remained negative."

 

[Dan Robinson]

And why is all this any more relevant to a TS than it is any other situation?

 

[Onetap]

And why is all this any more relevant to a TS than it is any other situation?

They aren't. All water systems are susceptible. But TS are NOT less susceptibel, as you had previously claimed on P 2, when you said that;

But this is potable water, it is not stored so Mr Legionella can s0d off.

Another benefit of TS I forgot to mention.

If you're not careful, you might actually admit you were wrong about that.

 

[Dan Robinson]

Not likely.

As I am not storing water, I do not have deadlegs, Mr Legionella can indeed s0d off.

there is nothing more I can reasonably do so there is no point worrying over it. Or are you suggesting every dwelling in the land is chemically treated to eliminate Legionella a few times a year?

Seems that doesn't always work according to your linky.

So, why on earth bring it up?

And you still haven't told me how all these combi boiler manufacturers are meeting L8.

 

[Norcon]

But TS are NOT less susceptibel

Than what?
An unvented cylinder?
Are you saying phe instantaneous delivered hot water is equal to cylinder storage in its ability to allow legionellae to proliferate within the system?

I would have thought the base of an unvented storage cylinder (particulary a solar cylinder) would be a much higher risk.

 

[Dan Robinson]

Or even an open vented cylinder without a diffuser, a lovely collection of scale sitting in the bottom increasing surface area for the lovely Mr Legionella to bread. Sitting most probably in the mid 40's.

 

[Onetap]

And you still haven't told me how all these combi boiler manufacturers are meeting L8.

Why would I tell you that?

I have no use for combis and L8 does not apply to domestic installations.
Combis, in some installations, would not achieve the recommended temperatures in L8 and could be hazardous. If you want some more information, speak to the manaufacturers of the combis you install.

 

[Dan Robinson]

So, as we are dealing with domestic installations, your posts are totally irrelevant.

L8 does not apply to domestic installations.

So now you can s0d off too

 

[Onetap]

So, as we are dealing with domestic installations, your posts are totally irrelevant.

L8 does not apply to domestic installations.

So now you can s0d off too

You're an idiot.
Has Mr Legionella read L8? You obviously haven't.

 

[Dan Robinson]

No need to get upset sweetheart.

I know you must feel you wasted your time, but really. The boiler market is now what? 70% combis?

None of them heat their plates to deliver 60 degrees on the secondary side.


You have been bleating on and on about legionellas for days now, then finally acknowledge L8 doesn't apply to anything in this thread.

You brought it up remember?

 

[DeltaT2]

I do not have deadlegs

Danny Boy, every house has dead legs, get over yourself FFS.............

Where's Water Systems has he been sedated in his padded cell??