How do they compare with solar water heaters?
Heat pumps can work effectively during the night and in wet weather provided the air temperature is sufficient. Some models can continue to operate to temperatures below 0C, though they will not achieve a very high level of efficiency. Heat pumps will operate most efficiently at higher air temperatures. Heat pumps can be a better choice than solar water heaters for locations with limited sunshine, providing that the temperatures are not consistently low. In locations with good year-round sunshine, a solar water heater that requires little boosting could use less energy. Getting the most out of your heat pump A well maintained heat pump, used in the right conditions, can give you trouble-free service. You should check regularly that the air vents around the evaporator are kept clean and clear of dust or leaves and other debris so air flow is not restricted. Most tanks have a sacrificial anode, a piece of metal that protects the metal hot water tank from corrosion by attracting corrosion
