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Restroom trailer for a 2026 winter wedding: heater BTU requirements?

Brooke L.asked 0 viewsRestroom TrailersRestroom trailerWinterizationGeneratorWeddingHeating

We're planning a January wedding on my parents' property for about 140 guests. We'll have a tent, a band, and a catered dinner, so it's a five-hour event with alcohol. The ground is a flat grassy area, and a truck can drive right up to the spot. The rental company offers a restroom trailer with three or four stalls, and they asked what our power source will be since we need heat. We don't have an outlet nearby, so we'll need a generator. How many BTUs does the heater in a trailer like this typically require to keep it comfortable on a cold day? And what size generator would that translate to?

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Jules T.Sacramento, CA

A restroom trailer heater for a winter wedding typically requires 20,000 to 40,000 BTUs to keep a three- to four-stall unit comfortable on a cold day. The exact need depends on the trailer's insulation, the outside temperature, and whether the doors are frequently opened.

This heat demand translates to a generator with a continuous wattage output of roughly 2,000 to 4,000 watts. The heater is the primary power draw, but you must also account for the trailer's interior lights, ventilation fans, and any water pumps if it has a sink. A generator with a rated wattage of 5,000 to 6,000 watts provides a safe buffer to run everything simultaneously without overloading the system.

For your event with 140 guests over five hours with alcohol, a three- to four-stall restroom trailer is an appropriate capacity. Ensure the trailer is placed on level ground and discuss winterization with the rental company, as the fresh water and gray water tanks need protection from freezing. Confirm the generator will be placed a safe distance from the trailer and guest areas to minimize noise.

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