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The flow temperature is particularly important to find out whether a heat pump is suitable for your house. The less temperature difference between the heat source and the heating circuit, the less energy is required. 35 degrees or less are ideal. This requires good insulation and high-quality surface heating (floor heating, wall heating, etc.). When the flow temperature is well over 45 degrees, the JAZ drops sharply and energy costs rise. In this case, you should definitely clarify with a specialist whether a heat pump is worthwhile.