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From purley that perspective it isn't, but I turn S9 on from time to time as an extra heat source during cold weather. Recently discovered it's noise also has benefits when your teenager daugther has a party with her friends in a different room in a flat, it supresses these screams etc. :)
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Home mining is a lot of fun. Make sure to look at your electric bill to see what your costs look like. It may or may not be viable based on that.