Run software.exe which will install the program on your computer. Read the manual and do all your calculations. This will give you radiator sizes for each room.
It is also worth going to http://www.sedbuk.com/ and checking the "recommended boiler size". This uses the Whole House method, ie does not work out the rads in each room, but the figure given by this method should agree fairly closely with the total given by the Barlo Program.
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