On Thu, 26 Jul 2007 23:21:21 +0000, Mike Holmes wrote:

I am about to convert my standard open vented DHW system with indirect
tank to a HeatBank system following the wiki @

http://wiki.diyfaq.org.uk/index.php?title=DIY_Heat_Bank - many thanks
to John Stumbles for that.

While trying to figure out what specification I require for the plate
heat exchanger, I happened upon this article, which suggests hot water
should be *distributed* as well as stored at 60degC.

http://www.bsee.co.uk/news/fullstory..._is_vital.html

Seems to be pitched at commercial-type installations. Obviously legionella
is possible in domestic ones too but AFAIK the outbreaks that have occurred
to date have been in larger ones. I don't know what the incidence of
legionella in domestic installations is but if you're concerned about it
(perhaps because you have a long dead leg of pipework feeding a shower)
there's a fairly elegant engineering solution with a heat bank that is to
distribute the primary (from the cylinder) and put a pump + (smaller) PHE +
flow switch etc close to the point of use.

Can't do that with unvented :-)

--
John Stumbles

Procrastinate now!