The installed cost of a solar system is about the same as a heat pump, or about twice the cost of a natural gas heater depending on the desired pool temperature. Operating cost is significantly reduced since only the pump draws power. The best type of pool and tub collectors are the rubber mat type. Rubber mat-collectors are virtually indestructible and are easily repaired if damaged. Solar domestic-water heating systems are economical where natural gas is unavailable.
Many systems use a solar powered pump for greater efficiency.
The storage tank should hold at least 20 gallons of water per family member. Extra storage capacity is a good idea and is not expensive. Solar systems should always be sized by a licensed contractor based on collector efficiency and occupant water usage. Most areas of Florida require a closed-loop system that uses antifreeze to protect the system from freezing. In these systems, the water in the collector can be drained back to the tank before a freeze.