what heater do you need?

420 Heater

(Four - 20 inch fin sections)

Line graphs comparing BTU per hour for steam heating and hot water heating at various entering air temperatures, with y-axis showing BTU/hr and x-axis showing PSIG in the top graph and water temperature in the bottom graph.

425 Heater

(Four - 25 inch fin sections)

Graphs comparing BTU per hour for steam and hot water heating at various entering air temperatures. The first graph shows higher BTU/hr values for steam heating at different PSIG levels, and the second graph shows BTU/hr for hot water heating at different water temperatures.

525 Heater Series

(five - 25 inch fin sections)

Graph comparing BTU/hr of different heating systems. 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,
Two line graphs comparing BTU/hr for steam heating and hot water heating at different entering air temperatures. The top graph shows steam heating at 0°F, 50°F, 60°F, and 70°F entering air temperature. The bottom graph shows hot water heating at 40°F

625 Heater Series

(six- 25 inch fin sections)

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
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.