Consistently high efficiency throughout the service life of the installation

The efficiency of ACV water heaters and combined boilers and water heaters is higher than any other traditional DHW (Domestic Hot Water) generators for the three following reasons :

1. The large surface area of the heat exchanger enables the use of all of the boiler’s output to heat DHW very rapidly. That avoids the necessity of stopping the boiler whilst the tank is being refilled, which blocks the heating system and causes the boiler to start and stop repeatedly, thereby impairing fuel economy and increasing the rate of harmful emissions.
2. Thanks to the exceptional heat transfer characteristics of the Tank-in-Tank system, the volume of hot water stored can be reduced, resulting in a more compact water heater design and reducing static heat losses via the exterior walls.
3. Self-descaling : each time hot water is drawn off, the inner tank  walls oscillate slightly, preventing the formation of lime scale. The efficiency of the Tank-in-Tank system remains high throughout the service life of the installation. Testimony from numerous users confirms that ACV 's " Tank-in-Tank " water heaters are truly effective in preventing the formation of lime scale as opposed to traditional coil systems that necessitate frequent descaling.