A spa isn’t complete without an efficient, reliable spa pool heater in place. The spa pool heater is responsible for warming your water so you can enjoy your spa in the off-season and in the evenings. There are three types of heaters available for your spa: natural gas, propane and electric. Each functions a bit differently and is suited for a wide range of pool owners.Gas heaters for your swim spa are a popular choice for spa owners because they’re able to quickly heat up the water. The waiting time to enjoy warm water is virtually nonexistent because they have the highest specific output. They’re available in either natural gas or propane. Propane will, as the name says, need a propane tank, and natural gas needs a connection line for fuel. They don’t rely on outside weather sources to heat your water, making them a viable option for many pool owners. Electric heaters for spas use the temperature of the outside air to warm the water. The warm air is drawn into the heater and then transferred through a heat exchanger to warm the swimming pool water. Electric heaters are ideal for spa owners in a warmer climate that’s above 40 degrees Fahrenheit, since they do run depending on outside weather sources.