Deemoss

Hi, I will be installing this heat pump soon but would also like to keep the current diesel boiler as backup. For simplicity, I'd like to be able to control both, the heat pump and the diesel boiler from LG's wired remote control. In LG's installation manual there is a reference to setup a 3rd Party Boiler but I am not sure what this refers to. The information in the manual is scarce. Do you know If I can control both heat sources with this one remote control? All the info I have is in the attachment. Cheers!