Have been asked to pipe up a multi fuel boiler for someone - I have very limited/no experience of these things and the customer already has the flue connected. It's rated at 27000 btu and has two flow's and two return inlets and outlets at the back of it, as this is going to be connected to a H2 link up panel do I simply blank off the two un needed flow & rtn's or pipe them and join them so there is only one of each further back along the pipe, sorry if the answer's obvious to some of you but I just want to make sure I don't do something I shouldn't.