This invention describes the processes of formulating heat generating graphite-sodium silicate (G-S) coating agents/mixes, and coating these mixes on base layer boards/panels to construct moderate to high surface temperature heating devices that are environmentally safe, fire retardant, and economically viable. The core to such heating devices is the formulation of G-S coating agents/mixes that are composed of graphite, sodium silicate, and aluminum silicate. In these coating mixes, the graphite is the primary heat generating agent, the sodium silicate is the main fire resisting agent, and the aluminum silicate primarily serves as surface heat control and water proofing functions.