PLANAR HEAT PRODUCING BODY, ELECTRIC HEATING BOARD FOR FLOOR HEATING, AND ELECTRIC HEATING BOARD AGGREGATE FOR FLOOR HEATING

摘要

A planar heat producing body (30) has parallel circuits (41-44) each formed by parallelly connecting heat producing resistor wires that produce heat by electricity. The parallel circuits are parallely extended while being adjacent to each other, and the adjacent parallel circuits are sequentially electrically connected in series to form a heater circuit. An area (105) where no heat producing resistor wire is placed and that extends in parallel to the parallel circuits is formed along at least one perimeter edge section of the planar heat producing body. Each parallel circuit is placed in a parallel circuit area having a width determined by (Ri/R) × W, where W is the overall width of the planar heat producing body including the area (105) having no heat producing resistor wire is placed in it, Ri is the electric resistance of each parallel circuit, and R is the total electric resistance of the heater circuit.