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Boiler with two stages

I have a boiler with two stages that has no gas rate modulation besides off and those two stages. What is the proper method to model this? Is the appropriate setting "SequentialLoad" for the Load Distribution Scheme at the "Supply Equipment / Demand Equipment" boundary? I tried that and "Optimal", but got the same water heating energy usage results either way.

image description

Boiler with two stages

I have a boiler with two stages that has no gas rate modulation besides off and those two stages. What is the proper method to model this? Is the appropriate setting "SequentialLoad" for the Load Distribution Scheme at the "Supply Equipment / Demand Equipment" boundary? I tried that and "Optimal", but got the same water heating energy usage results either way.

image description