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I've had both electric and gas pressure washers. I'm pretty sure that an electric will work fine for just cleaning concrete but the gas one will work faster due to more pressure. It might help to pre-treat the concrete with some type of cleaner. I'm not sure what type of sealer you are using but be sure to read the directions as the concrete may need to be completely dry which can take days depending on your humidity.
As for buying one, I would only buy the gas version again. This is more for convenience as you only have to tug around a hose and not a hose+electrical cord.
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