Natural gas is the preferred fuel for residential, light-commercial, and gaseous-only industrial standby applications below ~600 kW. Utility-supplied gas eliminates on-site fuel storage, simplifies AHJ approval (no UL 142 tank), and keeps PM intervals long under standby duty. Capacity is constrained by utility supply pressure (typically 5–14" WC residential, up to 5 PSI commercial) and by the engine's published BTU/hr at full load. Below are gaseous standby models in our service portfolio with manufacturer specs and field notes.
16 models in this category.
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300 kW gaseous-fueled commercial standby generator. Kohler/Rehlko 300REZXC large industrial gaseous unit for major facilities, paralleling applications, and campus power. Note: the 300 kW Kohler gas genset is sold as the 300REZXC, not as 'KG300'.
400 kW gaseous-fueled commercial standby generator. Kohler/Rehlko 400REZXB — the flagship of Kohler's industrial gaseous lineup for large facilities and paralleling arrays. Note: the 400 kW Kohler gas genset is sold as the 400REZXB, not as 'KG400'.
100 kW gaseous-fueled commercial standby generator. Upper-mid-range industrial gaseous unit for larger commercial facilities on natural gas or propane.
60 kW gaseous-fueled commercial standby generator with Kohler 6.2L engine, EPA Subpart JJJJ certified for stationary emergency. Specs, service intervals, common failure modes, and compatible transfer switches.