Pool Heaters

For swimmers and pool lovers, there’s nothing better than to make the swimming season longer. Having a pool heater is a great way to swim earlier in the spring and later into the fall along with keeping water temperatures more comfortable for early morning swims and late night dips in the pool. Pool heaters can add 10°, 20° or 30° F to the pool water, keeping the water comfortable through three seasons or even all year around depending on where you live.

PoolCenter.com is the place to go when you are looking for a pool heater. We provide a wealth of information and a large selection of choices for natural gas heaters, propane heaters, electric pool heat pumps and electric pool and spa heaters as well. We carry pool heaters to fit every budget and pool size from trusted brands like Hayward, Pentair, Raypak and Jandy.


Gas swimming pool heaters are available in many makes and models, with the basic difference being the type of energy the heater uses, e.g. natural gas or liquid propane, and their ignition style, e.g. millivolt or electronic start. Millivolt pool heaters utilize a standing pilot that must stay lit constantly to initiate the pool heating process, while an electronic start pool heater eliminates the need to keep a constant pilot burning. Ultra-efficient natural gas pool heaters and low-maintenance propane pool heaters utilize the latest in technology to ensure your pool water stays at the temperature you like.

Electric pool heat pumps operate like a reverse air conditioner. They pull warmth from the outside air to warm a refrigerant, which is compressed to generate more heat. Heat pumps are connected to a 30-60 amp breaker and operate at less than half the cost of using gas to heat the pool. They are limited however, operating only with outside temps of 50° or higher, and they also heat slowly, adding only 3-5° per day but can maintain the heat very efficiently.


Calculate the surface area of your swimming pool before you purchase a pool heater in order to determine how many BTUs it will take to warm your pool water to the comfortable level. Larger pool heaters will help warm your water faster and will save on heater running cost. If you are heating a pool and an attached spa, the models over 400K BTU are normally used. For pools without a spa, you can go down in size (250K or 325K), especially if a pool cover is used to retain pool heat or if you plan to use the heater rarely, or want to add only 10-15° to the pool water. Above ground pool gas heaters are often in the 100K BTU range. For heat pumps, above ground pools use a 50-75K BTU heater while inground pools will look for one in the 100-150K BTU range. Larger pool heaters will heat up the pool faster, and operate less, resulting in some degree of energy savings.


Another good question, and the answer is – it depends. The cost to heat a pool depends on the temperature difference between the pool water and the outside air and whether or not you use a pool cover (solar blanket or auto cover) to retain the heat. There are other variables like your pool’s surface area and wind speeds that help evaporate pool water which helps cool the water’s temperature. On average, you can expect a cost of about $200 per month to run a gas pool heater for a medium or large inground pool. Natural gas prices have declined while propane costs have gone up, therefore a monthly average cost could vary greatly depending on the type of gas service you have and the size of your pool.