On Thursday, 5 November 2015 14:22:15 UTC, rick wrote:
On 04/11/2015 22:31, nt wrote:


This extra electricity comes at times of high sun output, ie when ufh
is not usually being used. So in principle you could add a stat that
stops the ufh pump coming on when the cyl is too hot for it. Then you
get the benefit of your extra leccy without a bunch of extra costs.


Assume you mean a manual switch in summer turning off boiler and
enabling immersion .. with it's stat set higher .,.... an idea.

that's totally different to what I suggested

In order to draw off hot water you need to run a de-stratification pump

I'm not seeing why. It's not normally how things work

I presume your pump is drawn the wrong way round on that pdf.


NT

....... existing pump does this and cycles primary (thru boiler) .. not
an issue in winter when this extra heat goes into the building fabric.

If I were to turn off control system, the de-stratification pump & zone
valve (initiated by flow switch) would not work.

I would need to install a shunt pump & one way valve .. operated by flow
switch.

This pic shows what I have .. and where shunt would go.

The system is pressurised - left out expansion chambers and much of the
other kit for clarity.

http://www.4shared.com/office/XP0ObB...al_store_.html