Restroom trailer for a winter wedding: How much power does the heater draw?

Question

We're planning an outdoor wedding for 120 guests in January 2026. The venue has a gravel lot with good truck access, but only a few standard 120V outlets available. We're looking at a 4-stall restroom trailer with heating to keep guests comfortable. I know these trailers need power for lights, flushing pumps, and the heater, but I'm worried about overloading the venue's circuits.

How much power does the heater in a typical restroom trailer draw? Do we need a dedicated generator, or can we run it off the existing outlets?

Nina R. · Answer

A restroom trailer heater draws 1500 to 2000 watts per stall, so a 4-stall unit needs at least 6000 watts for heating alone. You cannot run that off standard 120V outlets; the venue's circuits will overload. You need a dedicated generator rated for the total load, which includes the heater, flushing pumps, lights, and any exterior lighting or climate control features.

For a winter wedding, confirm the trailer has tank heaters and insulated plumbing to prevent freezing. The rental company should specify the generator size, usually a 7000 to 10000 watt unit for a 4-stall trailer. Place the generator downwind and away from guest areas to reduce noise.

Also plan for weekly service visits to pump the holding tanks and restock supplies, though a one-day event may only need pre-event delivery and post-event pickup. Ensure the gravel lot is level and firm for trailer placement and truck access for delivery and servicing.

Restroom trailer for a winter wedding: How much power does the heater draw?

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