With all the new energy efficient systems now a days I would like to know what is a good one for a addition just put on my home I'm looking to put on a separate zone
Rooms include 600 sf fam 3 bedrooms one 240 one 120 one 200. Any and all input will help. I currently have hotwater radiators with air conditioners in central jersey area.

What have you looked at so far? Expanding the hot water system or adding a new system? If it is one addition with a separate zone, how about a small 90% gas unit.