Heating a restroom trailer for a New Year's Eve 2026 event.

A 5500-watt generator will handle the entire electrical load for a four-stall restroom trailer, including the main space heater, without tripping. The main space heater is the largest power draw, but it is designed to work with the trailer's other systems.

Your total load will be the space heater, the water pump for the flushing toilets and sinks, the interior and vanity lights, and any small vanity heater. A four-stall restroom trailer package is typically engineered to run on a single 30-amp or 50-amp circuit, which a 5500-watt generator can supply. The key is to not plug any other high-draw equipment, like catering warmers or sound systems, into the same generator.

Place the generator downwind from the trailer and guest areas to manage noise and exhaust. Confirm with the rental company the exact amperage requirement for your specific trailer model. I have run similar setups in freezing weather; the generator ran all night without issue, keeping the trailer warm and the water lines from freezing. Just ensure you have enough fuel for the entire event duration, as the heater will run continuously.

Nina is correct that a 5500-watt generator should handle the load, but you must confirm the heater's wattage with the rental company. Restroom trailer heaters vary, and some models draw more than others. Also, the water pump and any vanity heater will cycle on and off, so the total load isn't constant. Your generator's surge capacity matters for startup currents. Ensure the generator is rated for continuous operation at or above the trailer's maximum amperage, typically 30 or 50 amps, which a 5500-watt unit provides. Avoid overloading by dedicating this generator solely to the trailer, especially in freezing conditions where heat loss is critical.