Sakari Generator

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It all depends on the water pump you have(power consumption), do you really need to pump water during a power outage?

If you plan to take a hot shower during a power outage , these generators won't be enough, you need to have a look at 6KW and preferably diesel generators.

how do you flush a toilet during a power outage if the water supply to your home is done by a pump?

Use a friend's toilet.