a revolutionary new way to heat water for your home
a very compact and light, but very powerful and extremely efficient electric water heating system
They heat water as it flows through the unit, and do not retain or store any water internally except for what is in the pipe. These units can be powered by electricity, natural gas or propane. These types of heaters are also known as "in-line", or "on-demand" water heaters.
Instantaneous water heater
A water heater that heats water before it is directly distributed for end use as required; a demand water heater.