barbed fittings for 1-1/4 pex
closed cell foam
Ships heat runs off waste heat from Main Engnes or Genny's . Heat in the back ,DHW in forground.
After futile attempt with hand threader this worked much better
Removed that mistake
Boiler circ. and primary loop
cutting a hole for pex with diamond chainsaw
Future boiler room under deck
Looks like my beam holds 1400 lbs.
Boiler oom starting to take shape