A small electric heater with one heating element can use 1.0 kilowatt. Water temperature can be regulated with a thermostat and heater (or cooler). The typical Japanese water heater is tankless and heats water on demand. The heat source is typically a 300W dip heater. Then, the same system costs as much to operate as an efficient gas heater. Moka pots usually sit directly on a stovetop heater or burner. Finally it flows through the evaporator and super heater. This requires the supplementary heater (resistance electric or gas) to activate. Rinnai Malaysia developed the first generation Electric Instant Water Heater, Ore Series. The machine also lacked an internal water heater. A related component is the regenerative air heater. These cars came with amenities like glass windows, sport seats, a heater and air conditioning. Differences in temperature inside the masonry core of the heater can result in differential expansion. The AC unit was independent from the cabin heater. Scalding is a serious concern with any water heater.