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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. (Solar water heaters have risks of thunderstrokes. While electric and water are separated entirely for heat pumps.) Recommend reading: Solar Water Heaters V.S. Heat Pump Water Heaters, Competitors or Friends? |
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