Abstract: A valve controller for a hot water heating system having a water heating device, a water circulating device, and heater device. The Controller operates a water control valve between an open and a closed position, the valve controller comprising, a flow timer for variably establishing flow periodicity between a minimum flow time and a maximum flow time, a base cycle timer for variably establishing base cycle periodicity between a minimum base time and a maximum flow time. The base timer variably establishes a base cycle periodicity between a minimum base time and a maximum base time. A selector responsive to heat requirements for select a flow time and base cycle time.

Abstract: A modular power controller assembly is described for providing the application of power to resistive loads. The controller assembly comprises an enclosure for mounting controller modules, one or more modular heat-sinks, a plurality of SCR modules arranged in sets with each set on a corresponding heat sink, a timer board for controlling the percentage of time in the on-condition, and a driver board for switching each set of SCR modules. The timer board provides a controlled signal which optocoupled at the driver board with the gate of the corresponding SCR module. The SCR's switching is conducted at the zero cross over level thereby avoiding radio frequency interference.

Abstract: An electrical heating system for buildings is described in which the output voltage to a resistance heater is varied in accordance with outside temperature. The disclosure includes system means for compensating for solar radiation and wind effects. Also, night setback and morning start up are provided. The heat present on the interior of the building is provided in accordance with the building characteristics and without regard to interior temperatures.