Frustrating to own a pool that sits dormant six months of the year because it is too cold to use it? The price of gas rises. Electric resistance heaters, while inexpensive to install, are expensive to operate. If the heater is turned off, valuable weekend use time in the spring and fall is wasted. Solar thermal pool heating uses the free sunshine that falls on your roof and transfers that solar heat to the pool with little to no ongoing fuel cost. How Does Solar Thermal Pool