Instant Water Heater
An instant water heater heats water at the moment it flows through the unit, so it does not store any hot water. Many people also call it an instant hot water heater or a tankless water heater, and the electric version is known as an electric tankless water heater. Since there is no hot water tank to fill and keep warm, the unit stays small and hot water starts soon after you switch it on.
The instant models at Ryans are small shower heaters that you fix on the wall, and they suit flats, single bathrooms and homes with limited space. An instant heater can only heat the water flowing through it at that moment, so it works best for one shower at a time and may not be enough if several people use hot water together.
