Essentially, it allows the water heater to get much hotter during times when solar energy is available, and lets it drop to lower values before running the heater on utility electricity during ...

There are a lot of DIY solar water heater designs out there ... but there are apparently advantages to making the final ...

German startup Nexol Photovolthermic AG has unveiled a 1,500 W water heater that can use photovoltaic ... In the case of low solar radiation, the intelligent system reheats the upper zone of ...

Solar water heaters can only be used for water ... a spec listed on the yellow EnergyGuide label, or in product literature provided by the manufacturer. It tells you how much hot water the ...

There are other water heaters that can be even more energy efficient, though, like solar water heaters. These heaters use solar panels to capture sunlight and convert it into energy for heat ...