Solar Flare wrote:

In tests of thousands of water heaters 40% were found to contain lethal
doses of legionella bacteria.

Further testing found that none of the water heaters were gas fired.

Bet that was just because so few of them were gas fired.

Only the electric heated units were the problem below the bottom element.

Because most codes mandate a minimum thermostat temp.

I believe as long as the water is moving frequently and/
or heated past 96F the legionella is rendered inert.

You're wrong on that last. Needs to be 140F

And there is no 'rendered inert', its either killed or it aint.


"Rod Speed" wrote in message
...
daestrom wrote:
"Robert Gammon" wrote in message
. net...
wrote:
Robert Gammon misunderstands again:
snip
Goto www.gfxtechnology.com/GFX-STAR.html and click on Application
Notes and click on the link to Retrofit of an existing Solar Hot
Water Heater. You sir, need to READ first, before you make
accusations that you
cannot back up with facts.

In there he describes a patent pending application of GFX Star in
an
industrial process control application.

The models of what happens to the efficiency of his product with
changing potable water flows thru the equipment are there for all
to
see.

Okay, *I* read the documents. It is clear that you must have a
separate storage tank for the GFX-star setup to work 'as
advertised'.
Only by using a *cooler* separate storage tank is the setup able to
capture the waste heat from 'batch' drains. Once the storage tank
reaches the temperature of the greywater (or exceeds it in the
conventional heater storage tank), performance will drop off.

This way can effectively 'shift' the heat from outgoing batch
drains
to a separate storage tank of fresh-water. So the greywater
doesn't
have to be stored, and you can still use the low-maintenance,
straight-bore, GFX heat-exchanger.

For 'best' performance, you would want to route the storage tank
outlet to the 'cold' tap for the shower as well. This looks like
their 'tempering valve' arrangement. But you might be better off
routing straight 'cold' water from the supply directly to sinks and
laundry, bypassing the whole setup for cold supply to those usage
points. Otherwise you would be wasting some of the captured heat
on
laundry, and who wants a glass of warm water to drink. Some more
plumbing :-(

Someone mentioned some concerns about storage tank of 'warm' water
and
Legionarries disease. But if you have treated water, that probably
isn't too much of a concern.

It is with storage water heaters.