Energy calculations (Heating energy), Simulator

Hi,

I'm trying to run energy calculations to compare two systems: heating via LTHW boiler and via electric heaters. What I have noticed, I can only run calcs for wet system only. Is there an option to run energy calculation for electric heaters?

Also, I've tried to use 'Simulator' option but I've got a warning saying that weather data is not available for this location (Cardiff). How can I solve this problem? 

Thank you in advance for your help.

Patrycja.