What is the minimum and maximum Btu/hr input for each model?
The RTG-42PV input ranges from 31,500 Btu/hr to 118,000 Btu/hr. The input of the RTG-74PV, RTG-74X, GT-199PV and GT-199X ranges from 19,000 to 199,900 Btu /hr. These models are equipped with electronic modulation capability, which automatically adjusts the Btu input to use the minimum Btu input needed to meet demand.