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Electric DHW immersion tank

Posted: Wed Sep 27, 2017 9:27 am
by Michela
Hi
I am modelling an existing flat in UK where the DHW is provided by an electric immersion tank.
How should I define such system in Apache Systems? Is it correct if I set the UK NCM wizard as "GENERIC Heating only - Electric resistance", then tick the box "DHW served by the ApacheHVAC boiler"? What can I assume to be the delivery efficiency? And why, if these assumptions are correct, the electricity consumption that I obtain from the simulation is far above the actual one given by the utility bills?
Any help would be greatly appreciated!
Michela