Depending on your selected system, enter the volume and insulation thickness of either the domestic hot water tank or the heating buffer tank.

Based on your selection on page System selection, the corresponding tanks are displayed on the page tanks.

• DHW tank
• Combination tank
• HW tank and Buffer tank

When choosing combination tank, make sure that they are designed for heat pumps.

Proceed as follows:

1. Enter the volume of the tank:

   • DHW tank: It should be greater than the daily requirement for domestic hot water.
   • Combination tank: Its size depends on the size of the solar installation.
   • Space-heating buffer tank: It should be large enough to account for domestic hot water requirements and power cuts.

2. Enter the insulation thickness of the tank. The tank is assumed to be outside the thermal envelope.

3. Proceed to the next page.