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+ Solar water heaters can't be used alone in rainy or cloudy days. Electric supplementary heaters will be necessary. And the COP is only 2, much lower than heat pumps. + Installation of integrated type solar water heaters is restricted. They are only fit to be installed on the roof of a building. + The hot water supplied by solar water heaters have difference in temperatures and the hydraulic pressure is low. So it is not so comfort for showers as heat pumps. + Solar water heaters use glass tubes and open water tanks. So they are easier to be damaged by nature disasters. + The efficiency of split type solar water heaters is even lower than integrated type (only 60% of integrated type). + The safety of using solar water heaters is also not as good as heat pumps. |
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