All heaters have a data plate. Often the model # is the BTU's. For example, H400 is a 400,000 BTU output. The plate is on the inner firewall. All heater have different BTU's.
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All heaters have a data plate. Often the model # is the BTU's. For example, H400 is a 400,000 BTU output. The plate is on the inner firewall. All heater have different BTU's.