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

DHW storage is not an issue with the Heat Bank idea. However, is it
really neccessary to distribute water at this temperature? The same
article suggests that water 45degC can cause serious scalding; I have
been figuring on using a TMV just after the output from the PHE
secondary to mix the hot down to a max of 50degC lets say, rather than
60degC.

As I get about 30l/min flow from th rising main, to be able to
guarantee my DHW is at 60degC, would mean either a very high Heat Bank/
PHE primary temperature ie probably 80degC, or a really high ouput
PHE ie 100kW.

At the end of the day the environment and costs are an issue; the
environment because I don't want to heat the store any hotter than
necc (have read in another thread that heatbanks work well with the
store as low as 70degC); costs because a the higher output PHEs
obviously cost more

Thanks


Mike