If your home is like most, it is common for two showers to be going at the same time. For this, a more advanced model of tankless water heater is needed.
Most people find the added initial expense to be well worth it, and a big money saver in the long run. Regardless of the type of tankless hot water system you decide on, make sure it meets the needs of your household.
Make Sure You Buy The Right Water Heater - Visit Tankless for more information on this.