I trying to finish installing a Central Boiler wood fired
heating unit. Visit their website:  I am concerned about what
will happen when the hot water moves through the insulated
underground PEX line to the hard copper connection in the
basement to the hot water tank & heat exchanger in the forced
air furnace.  My questions are: 1. Do I need a flexible copper
fitting where these lines connect at the transition? 2. Should I
use a copper "Fast/Flex" connector as manufactured by Slant/Fin,
Greenvale, N.Y. 11546 Phone 516-484-2600? There is nothing on
their website http://www.slantfin.com/contact.html 3. Is there
another product available which gives the same flexible
transition from hard copper to plastic PEX pipe?  Thank you for
any advice!  Jerry Gibbons Dowling, MI