After viewing this site for the last two years decided to tackle this project, with lots of help of course. First bit of advise plan your project well in advance if possible(something I never do well). I'll try to explain things as I go with pictures hopefully giving someone else ideas or info as this site has given me. First picture is house to be heated and the location of the garage which the boiler will live in. Also where my first of many mistakes was made. First plan was to have the garage radiant run off the house boiler as a zone, using 1" pex not even tru 1" ID non oxygen barrier of course (mistake).