There are a variety of tankless water heaters on the market, but not all of them come in 110 volt models. 110 volt tankless water heaters are typically less powerful than their 220 volt counterparts, so they are not as common. However, there are a few options out there for those who are looking for a 110 volt tankless water heater. The Rheem Performance Platinum 8.4 GPM Electric Tankless Water Heater and the Eemax EEM24018 are two examples of 110 volt tankless water heaters.