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For any appliances that plug into a standard 120vac wall outlet we recommend a Belkin that can handle a max of around 1000 joules, like this one: http://amzn.to/2iL5tKR
The point is to get a trusted name brand. Not worth saving a few bucks for a device that’s protecting an expensive appliance!
For 240vac protection, you have to install a device at the breaker box. So that’s not just a plug-in solution. It’s an electrical installation that can be done by an electrician or a DIYer who is comfortable with basic electrical projects.