water solar heater
Which is more energy efficent, tankless water heater or solar heating?
i am having trouble deciding which is better. tankless water heaters are turned on only when i need hot water, but solar heating preheats the water with solar energy. I know there is no heat loss for the tankless and it saves more space.
They are both efficient. The problem with solar as mentioned is that they are subject to the availability of sunlight. I believe that ambient temperature has an effect on efficiency, that is, in the winter the water won’t be as warm as in the summer.
Tank-less is more reliable. But you have to get one that can heat the volume of water you expect to use.
A solar + tank-less will be okay for long duration water use (like showers, laundry). It takes time for the warmed solar water to get to the point of use. If you’re just washing your hands, you’ll use the tank-less and none of the solar water. I don’t believe any homes are plumbed for two water systems (solar and other).
Using a circulating pump with a solar system may help its efficiency but it costs a few dollars a month to run.
Check this site:
http://www.tanklesswaterheaterguide.com/
If I had the bucks, I would put tank-less systems at each fixture.
homemade solar batch water heater
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