Indirect water heaters can be powered by electricity gas solar or a combination of these.
Tankless coil vs indirect water heater.
Meanwhile an indirect heater can provide unlimited hot water per minute up to as many gallons as the tank can hold.
Tankless coil water heaters are most efficient during cold months when the heating system is used regularly but can be an inefficient choice for many homes especially for those in warmer climates.
In terms of energy efficiency standpoint the on demand heaters and indirect systems are equal.
Oil gas electricity propane solar energy or a combination of any of them can fire the indirect systems.
May require a backup system for cloudy days or high demand times.
Indirect water heaters have a limited hot water supply and require flushing two issues a tankless heater is less prone to.
A tankless coil water heater provides hot water on demand without a tank.
Can be used in any climate and the fuel sunshine is free and a renewable resource.
On the other hand tankless systems are oil electric or gas fired.
Also by providing hot water only when it is needed tankless water heaters waste less water and eliminate standby losses associated with maintaining a tank full of hot.
In fact due to their small size tankless water heaters can be mounted on the wall.
Tankless water heaters compact in size take up less space than tank style water heaters.
50 more efficient than gas electric water heaters.
When it comes to energy efficiency both indirect heaters and tankless systems are almost equivalent.
The most obvious difference between an indirect and tankless heater is the existence of a tank.