A: Baseboarders panels and accessories are designed for us with hydronic baseboard heaters, but can be used with other types depending on the dimensions (specifically height and depth). The Basic style panels are 6-3/4" tall, the endcaps are 7-1/2" tall and the inside depth is 3". Note: Baseboarders styles do not accommodate for knobs, levers, thermostats, etc. since hydronic baseboard heaters do not require these functions.
A: there is a connector, I bought mine from home depot.
A: The Basic style does not offer an outside corner piece. The Premium style will need to be used for units requiring an outside corner.
A: There is not a difference in functionality - just two different designs / looks. Basic has perforations at the top portion of the panel. Basic has a 2-yr warrany against rust. Premium has perforations on the entire panel. Premium has a lifetime warranty against rust.
A: The length options and look.