Tankless hot water heater?

I, too, looked into these. I might be wrong, but I think that if you have a tankless water heater installed you have to have a ventilation system also. I think you have to have them flushed out annually, too. They are much more expensive than standard water heaters but they have many benefits. You never run out of hot water (within reason) and it only heats water when it's needed.