Air Source Heat Pump not Heating Water
Recently, a customer reported that their air source heat pump (ASHP) was no longer heating water as efficiently as it used to after years of use. What exactly causes insufficient hot water supply? To better understand this issue, we consulted technical engineers and summarized several reasons why the water outlet temperature might be inadequate.
1. Insufficient refrigerant
Refrigerant is the key substance used by air source heat pumps to heat water. To generate thermal energy, the heat pump relies on the refrigerant as an intermediate medium to absorb energy from the air. However, prolonged use can lead to refrigerant leaks. Once the refrigerant level drops, the unit's heating capacity naturally decreases, resulting in a noticeable drop in hot water temperature.
Solution: Replenish the refrigerant.
2. Scale accumulation
Because the components of an air source heat pump are constantly exposed to hot water, scale buildup is common. Scale consists of various complex compounds and has low thermal conductivity. A significant accumulation of scale within the hot water system occupies space intended for the water, thereby significantly impairing the heat pump's heating performance.
Solution: Regularly clean the heat pump system.
3. Improper installation
As the name implies, an air source heat pump generates heat by absorbing energy from the air. Therefore, while it does not require coal or natural gas, the choice of installation location is critical.
Solution: It is generally recommended to install the air source heat pump in a well-ventilated area, such as a balcony or garden. These locations offer strong airflow and suitable ambient temperatures, which facilitate the heat pump's ability to absorb heat and generate warmth.
4. Excessive dirt accumulation on evaporator fins
Just as dirt accumulates within the water system, the evaporator fins—which are in direct contact with the outside environment—can also gather debris. The heat pump relies on these fins to interface with the air and absorb thermal energy.
Generally, the greater the contact area between the evaporator fins and the air, the better the unit's overall heating performance. However, during long-term operation, airborne dust, hair, and other particles can coat the fins, thereby reducing the heat pump's heating efficiency.
Solution: How to clean it? It is simple: turn off the water heater, spray the appropriate cleaner onto the evaporator fins, wipe them down from top to bottom with a cloth, and finally rinse clean with water.
Professional assistance required
If the air source heat pump still has issues after you have tried the methods above, do not worry—you are not alone! Please consult a professional heat pump repair specialist for further assistance.
