Solar Pool Heating
You can significantly reduce swimming pool heating costs by installing a solar pool heater. They're cost competitive with both gas and heat pump pool heaters, and they have very low annual operating costs. Actually, solar pool heating is the most cost-effective use of solar energy in many climates.
Electric Heat Pumps
Pool Heat pumps use the same principle as reverse cycle air conditioners. They extract heat from the air (even down to sub zero temperatures) and, through a series of compression and transference technology, heat the pool water. They work in almost any temperature, with some catering to sub zero temperatures, as well as indoor installations.
The great benefit of this technology is the low running cost. In a side-by-side comparison, a heat pump will cost around 60% less to run than a gas heater, making pumps perfect for anyone who wants to have their pool available 24/7, 365 days a year.
Gas heaters are the best for heating pools or spas up quickly as they use direct and constant heat from a flame either through natural gas or LPG tanks.
A gas heater is an ideal choice for anyone who uses their pool sporadically throughout the year and may only want to heat it occasionally such as when friends are coming over or for the weekend.