NOVELTY - The solar heat flat panel collector has an inner slider bracket unit in sliding relationship to an inside of a wall region (202) and in fixed relationship to an outer slider bracket unit (214). A manifold end unit (204) passes through and is supported in an aperture of the inner slider bracket unit. The guide profilings on the wall region is parallel to the sliding direction. The guide formations provided on either or both of the inner and outer slider bracket units are matched and is in sliding engagement with guide profilings on the outside of the wall region.    USE - Solar heat flat panel collector e.g. solar water heater flat panel for water heating.    ADVANTAGE - Since the inner and outer slider bracket units are in sliding relationship to the inside and outside of the wall region and with guide profilings of the wall region, rain from entering the wall region is prevented. The sliding direction is designed parallel to the plane of the bottom wall so as to compensate for thermal expansion and contraction. The slider bracket units are preferably made by injection molding of a plastics with a low coefficient of friction and the side wall region is made of aluminium and a thermoplastic resin composition, UV-stabilised polycarbonate, hence the suspension can withstand the high temperatures occur under extreme operating conditions and can minimize heat losses through the slidable suspension region. Since a sealant is applied to the surface of the groove, additional protection is provided against water ingress into the panel even under severe weather conditions.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method of alleviating thermal expansion and contraction stresses in solar heat collecting panel.    DESCRIPTION OF DRAWING(S) - The drawing shows a side view of the side wall region of the panel.    Wall region (202)    Manifold end unit (204)    Outer slider bracket unit (214)    Inner slider bracket unit (217)    Hollow cylindrical spacer studs (260)