Industrial Grade Flat Panel is designed for hot water production and can be integrated in to the roof and can be connected in parallel up to 12 collectors. The Flat Panel has pipe flow and return that enable easy installation and safe battery collectors and older batteries can be mounted up to 12 collectors connected in parallel and is used for rooftop installation. The Flat Panel is designed with copper absorber and effective coating and can be availed in various colours. The Flat Panel has mounting system for easy assembly with stainless steel components and corrosion-resistant aluminium and has posterior wall that is impact and corrosion resistant. The Flat Panel has an absorption area from 1.74 m2 to 2.1 m2 and the flat plate collectors are adapted to the demand of energy in each case. The Industrial Grade Flat Panel can be installed vertically or horizontally.