Electrical convertor heater

Claim 1

A convector heater comprising: a front plate; a surround spaced around the periphery of said front plate; an air gap defined between said front plate and said surround and including a top air gap portion, a bottom air gap portion and two lateral end air gap portions, said top, bottom and lateral end air gap portions being of similar width and said air gap being continuous around the entire periphery of said front plate; a back plate connected at the periphery thereof to said surround and spaced from said front plate; a convection air space defined between said front plate and said back plate, said convection air space being directly connected to and opening into the surrounding atmosphere around the entire periphery of said front plate through said top, bottom and two lateral end air gap portions; heat exchanger means disposed in said convection air space at the bottom thereof for inducing a primary convection air flow inwardly through said bottom air gap portion at the bottom of said front plate; upwardly through said convection air space, and outwardly through said air gap portion at the top of said front plate, and for causing said primary convection air flow to induce secondary convection air flows inwardly through said lateral end air gap portions, upwardly through said convection air space, and outwardly through said top air gap portion; and control means disposed at one of the top corners of said convection air space, the arrangement being such that the air flow impinging on said control means includes air from said secondary air flow entering through said respective lateral end air gap portion and is cooler than said primary convection air flow leaving said top air gap portion.