Abstract: A manifold kit for a solar heat exchanger of the type having a mat of tubes connected to inlet and outlet manifolds. Each manifold has at least one, preferably 5, groups of spigots tubes with three spigots in each group. Each group of spigots comprise a base fitted to the manifold a planar region on said base and a plurality of tubular spigots projecting from said planar region. A connector is adapted to receive a group of 3 heat exchanger tubes in one end and adapted at the other end to connect to a group of 3 spigot tubes on the manifold. This arrangement avoids the need for special tools during installation and the group of heat exchanger tubes can be easily fitted with the connectors and then snapped onto the manifold.