I have a toilet on the lowest floor of our house which is on a slab. It does not benefit from gravity as our two other bathrooms do and it often requires a couple of flushes to do the job. The plunger handle is getting worn down from overuse. I was considering replacing it with a power flush toilet but I don't know much about them. Any model recommendations? Do they require electrical power, etc. ? Any guidance or alternative suggestions would be greatly appreciated.