WB CDi weather comp/load comp and modulation with tado

Hi,

I have a wb CDI boiler with full tado setup Inc trvs, extension kit and wired thermostat. I'm just now starting to look into more technical areas of heating controls and am seeing things about weather comp and load comp and boiler modulation. If I read right, tado can modulate the boiler but it must be wired into the boiler properly to work. As it stands the extension kit was a direct replacement for your standard programmer so I presume it's just on/off switching but I'd like to make it more efficient if possible so that's what I'm looking for info on. Thanks.