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A prototype input controller for storage heaters was developed and constructed at Capenhurst. This controller, named the Delstat, consists of a weather sensing central controller, which energizes power to the storage heaters at a time which is a function of the external temperature. Halfway through the low rate period, control is transferred to a room thermostat in each heated room which turns off the power to the heaters when the set temperature is reached. Since the initial stages of development of the Delstat, storage heaters have appeared on the market with their own built in charge controllers, which sense room temperature adjacent to the heater. Storage heating systems were set up in two identical test houses at Capenhurst so that the performance of the two types of controller could be compared.