On 11/11/2016 13:05, rick wrote:
On 11/11/2016 09:48, John Rumm wrote:


How is the store heated? (i.e. direct or indirect coil)

Direct - whole contents of store circulated around boiler
2 heat exchangers - lower for UFH
Upper for DHW (with Thermostatic mixing valve)

ok, so it can take the full boiler output which makes it a bit simpler.

as per: http://tinyurl.com/ngeqfsy

Yup saw that, was just not sure if there was no coil or you had omitted
it for simplicity.

The tank is set to 60 degrees .. to limit max temp of water that can get
to UFH circuits.
My plan is to install a Thermostatic Mixing Valve set to 50C and run
tank at higher temp (probably 70)

It would store more energy in the tank, at a slight cost in boiler
efficiency (but probably only for the last few degrees of the reheat).

The store has a baffle - to help stratification, but as soon as you draw
any hot water it energises the pimp on primaries to 'stir' the store and
keep recharging heat exchanger.


--
Cheers,

John.

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