If you do not plan automation or transition to NG in the future then the BG10 for the HLT and BG12 for MLT and BK would work well. If automation is in the future and low pressure controls used, then the HLT and BK burners should be upsized to the BG14's as the output is reduced at lower gas pressures. If you are looking at solenoid control for the burners then avoid the overpriced ASCO's and source other more reasonably priced alternatives for the fuel system. A safer standing pilot low pressure furnace valve approach runs around $85 per burner with valve, pilot, and thermocouple.
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