Hi thinking of changing gas boiler to the fusion 36kw does anyone know how many rads it can feed as i have 14 in total 5 which are doubles 1200 x 600 rest diffrent sizes, also what amp cable will i have to get run to it as this might be expensive ,boiler inc vat £1034 which aint bad to get rid of gas.It says in basic literature 3 phase have no idea what this is just thought ask some advise before going ahead Thanks Brian