Abstract: A high-temperature electrical resistance heating module which employs a graphite or equivalent material electrical resistance element in an arrangement providing for pressurized fluid cooling of the heater support headers, and additionally provides a reradiating reflector assembly. The module includes resistance element thermal expansion accommodation through the use of a high-temperature simple expansion support member located in close proximity to the heater resistance element where binding and distortion forces are minimized. The disclosed heater module can be used in any physical orientation in a nonoxidizing atmosphere such as nitrogen or vacuum and can achieve operating temperatures in the range of 4500.degree. F. Energy dissipation densities in the range of 350 BTU per square foot second and operating energy dissipation in the range of 140 kilowatts are achieved. A typical use of the heater in laboratory testing of high-temperature transatmospheric aircraft components is disclosed.