I have an E10 smart meter. It was via our power who are defunct now. Having a wet electric heating system you absolutely should be on E10. Unsure as to why OVO replaces? Have a look on this site at the list of providers that off E10. Utilita, First Utility, OVO, E.ON and Bristol Energy All supply the meter you have. Worth a bash calling round them to see if they can help? Except OVO of course.