What is the expansion volume of the heat exchanger of the SPRING panel and the DualQuickFit hose?

At +20°C the heat exchanger of the SPRING® panel has a volume of 5 liters. 

Neglecting the expansion in thickness (small dimension) we obtain the following results : 

• At -20°C, i.e. a negative differential of 40°C compared to 20°C : the exchanger contracts and reduces its volume by 1.2% to reach 4.94L.
• At +70°C,  i.e. a positive differential of 50°C compared to 20°C : the exchanger expands and increases its volume by 1.5% to reach 5.08L.

As far as the DualQuickFit® flexible hoses are concerned, we can consider that the diameter remains unchanged because of the small thickness of the skin. However, there will be a slight variation in length : 

• At -20°C, the DualQuickFit® hose will reduce its length by 0,6%
• At +70°C, the DualQuickFit® hose will increase its length by 0,8%