GRAPH #1 Graph #1 illustrates the energy performance of a house that has a hot water boiler with cast iron radiators. The red line illustrates the room temperature, the green line illustrates the outside air temperature and the blue line illustrates the run time of the burner. The computer trending program provides the highest, the lowest and the average value for each of the three channels. The boiler was required to run 45.2% of the time, maintaining the house at an average temperature of 70.26°F, with an average outside air temperature of 28.4°F. 8.153
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