Hi paolo33,

As this is just a normal house that is rented out and not a business premises, it sounds like you should definitely be billed on domestic tariff.

I'd contact E.ON again and advise that this is not a business and the account needs to be re-billed, you will normally find that online tariffs are the best, but you will need to meet certain criteria to be on these. This is something to ask about when you call.

Hope this helps.

Helena