A heater coupon including a ceramic block having a first surface and a second surface, at least one heater trace formed within the ceramic block and a connector for electrically connecting the at least one heater trace to an external wire wherein the connector comprises a first connecting arm for connecting with respect to the first surface of the ceramic block and a second connecting arm for connecting with respect to the second surface of the ceramic block. The connector may be located at an end of the ceramic block. The ceramic block may be formed from a plurality of layers of ceramic material. The at least one heater trace may be screen printed onto one of the layers of ceramic sheet that form the ceramic block. The ceramic block may be provided with a first recess for accommodating the first connecting arm and a second recess for accommodating the second connecting arm.