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The top graph shows steam heating with four lines for entering air at 0, 50, 60, and 70°F, increasing with PSIG. The bottom graph shows hot water heating with four lines for entering air at 40, 50, 60, and 70°F, increasing with water temperature. https://images.squarespace-cdn.com/content/v1/66574d4824dca734471079dd/aedd618c-d0c1-453f-9fd6-de9acaf7609a/heating_625_1hp_chart.jpg Heater Charts Line graphs comparing BTU/Hr for steam heating and hot water heating at different air entering temperatures, with the top graph showing steam heating at various entering air temperatures (0°F, 50°F, 60°F, 70°F), and the bottom graph showing hot water heating at water temperatures from 180°F to 240°F. https://images.squarespace-cdn.com/content/v1/66574d4824dca734471079dd/36748391-3462-4588-a6c5-378e53d816ec/heating_525_1hp_chart.jpg Heater Charts Two line graphs comparing BTU/hr for steam heating and hot water heating at different entering air temperatures. 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The bottom graph shows hot water heating at 40°F, 50°F, 60°F, and 70°F entering air temperature. https://images.squarespace-cdn.com/content/v1/66574d4824dca734471079dd/ba51b4ec-24e4-4f33-bc18-86426e1872ca/heating_625_2hp_chart.jpg Heater Charts Graphs comparing heat transfer in steam heating and hot water heating systems at various entering air temperatures, with BTU/hr against PSIG in the top chart and BTU/hr against water temperature in the bottom chart. https://images.squarespace-cdn.com/content/v1/66574d4824dca734471079dd/fc749125-2826-4df1-8243-68427c576c8a/heating_420_1_2hp_chart.jpg https://images.squarespace-cdn.com/content/v1/66574d4824dca734471079dd/1722359255709-32WPHOOVP6D6EVOA4H2S/heating_425_1_2hp_chart.jpg https://www.castironheaters.com/contact daily 0.75 2025-12-10 https://images.squarespace-cdn.com/content/v1/66574d4824dca734471079dd/65d4094c-5130-4fed-bd73-03ca1054e292/grid+heater.jpg