Generac air-cooled home standby generators

Most rows carry a Canadian mark as Generac prints it. The cellular spec sheets state that the unit carries certification for both the US and Canada. The Guardian sheets give a CETL or CUL listing to units sold on their own or with the limited circuit switch. The sheets for the Guardian 20 kW three-phase and the Ecogen show the UL 2200 listing only, so those two rows ask you to confirm availability with us. The certifications column shows the listing each sheet prints.

Generac's support article on cold weather accessories covers its Next Generation Series units of 10 to 28 kW and its Guardian Series units of 10 to 26 kW. It recommends a battery warmer and an oil filter warmer where temperatures regularly fall below 0 °C, and a breather warmer where heavy icing occurs. These warmers are sold separately. Every spec sheet behind this table lists them as accessories, so the cold weather column reads yes on each row.

A house on the gas main should be sized from the natural gas column, since most of these units give less power on natural gas than on propane. The spec sheets also state the gas pressure each unit needs at its inlet and say the gas piping has to be sized for the unit at full load. A licensed gas fitter checks that. On the electrical side, the transfer switch keeps generator power from flowing back into the utility lines.

The Electrical Safety Authority (ESA) notification of work is filed before the work starts. When the installation is done, ESA inspects it and issues a Certificate of Acceptance once it passes. Where the unit burns natural gas or propane, a licensed gas fitter makes the gas connection. Where a meter or a service entrance switch is involved, the local utility does its part of the work.