Generac Guardian™ 11kW Standby Generator System (200A Service Disc. + AC Shedding) + 3" GenPad™ + Battery Free Wireless Monitor (6664)

Below is a link to the three items for the cold weather kit. The breather heater is not needed unless you are in a very cold climate such as Montana or Northern Minnesota.
Generac 9-22kW Air Cooled Battery Heater Kit
Generac 9-22kW Air Cooled Oil Heater Kit
Generac 9-22kW Air Cooled Breather Heater Kit

The regulator included in these units is intended to fine-tune the pressure entering the engine. A primary regulator may need to be supplied in the field if gas pressure entering the unit is too high. Generac requires a pressure of 3.5"-7" w.c. for Natural Gas and  10"-12" w.c. for Propane.  This would have to be determined by a local plumber and/or gas company. Further details can be found on page 17 of the installation manual.

Properly sizing the generator is crucial to the success of any generator installation and requires a good working knowledge of electricity and its characteristics, as well as the varying requirements of the electrical equipment comprising the load. A certified electrician needs to be consulted for proper sizing and installation of any generator. When analyzing the electrical load, consult the manufacturer’s nameplate on each major appliance or piece of equipment to determine its starting requirements in terms of amps and voltage which can be calculated to watts using Ohms Law (Amps x Volts = Watts). When choosing the generator output select a rating that is approximately 20 to 25% higher than the peak load (for example, if the load is about 8 kilowatts, select a 10 kW generator). A higher rated generator will operate comfortably at approximately 80% of its full capacity and will provide a margin of flexibility if the load increases in the future. Note: Applications that are commercial, all-electric homes, have heat pump systems or geothermal systems require special installation procedures and a certified electrician must be contacted to evaluate and install these types of systems. Home Standby Buyers Guide.