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The tankless water heater concept is simple, heat as needed rather than keeping an excess water supply on hand.

Tankless Solar Water Heaters

Now that you have a good feel for the different types of reservoir utilizing systems we will talk about the one type of water heating that does away with all of that excess. That method uses tankless water heaters. So what are they?The first tankless water heaters were electric models and the concept is simple. We use a large amount of energy maintaining 40, 50, even 100 gallons or more of water in some cases at a temperature of over 100 degrees Fahrenheit. We could save most of that energy if we could simply heat water as it was needed, rather than keeping an excess supply on hand just in case it becomes useful.

From electric models, it was a natural step to take an already energy friendly innovation and make it environmentally friendly as well. This is done by utilizing photovoltaic arrays to power the tankless heater. The heaters, such as this one are inexpensive compared to the investment level of a electric-free water heating system. However, if you factor in the cost of enough solar panels to power the unit, the price of installation is remarkably similar to other forms of solar water heating.

Tank free water heating is an excellent idea in some cases, but it really depends on the average volume of water use in your household. While it is true that all tank free systems cut out the standby cost of hot water, it is actually more efficient overall to heat the water in a tank over time than it is to flash heat it on demand. This efficiency gain is offset by the sheer volume of water kept hot, and the fact that a water heater is always running, while the tank free system only runs for a few minutes at a time in most situations.

So when is a tankless solar water heater right for you? If you have a 40 or 50 gallon tank and you rarely run out of hot water, you are a prime candidate to save energy by switching to a tank free setup. If you burn through a 100 gallon tank of water on a daily basis on the other hand, the volume of your demand for hot water makes an active reservoir system your most efficient prospect for water heated by the power of the sun.

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