My parents have one, it kicks out plenty of heat when turned up. It has a fan which blows the heat around the room. Not sure what you mean by use the chimney.
Does it have any exhaust fumes? Sounds daft now I ask again - pretty sure it doesn't as it's not burning anything!
No you just bolt them to the wall and plug them in. My sister has something similar.
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My parents have one, it kicks out plenty of heat when turned up. It has a fan which blows the heat around the room. Not sure what you mean by use the chimney.