The hot water tank in the IVRFW is stainless steel PUF insulted tank which has a heat exchange coil. The tank also has an auxilary electric heater of 3 kW capacity.The unique construction isolates the water entering the tank from the hydro box. The primary water from the hydro box is circulated through coils inside the tank.
This ensures consistent performance of the system as the quality of the water supplied may affect the performance of the hydro box in the long run.