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Swimming Pools |
Swimming Pool Pump and Motor
The Swimming Pool Surface Skimmer
The Swimming Pool Piping and Plumbing
The Swimming Pool Activating the Water
Heating the Swimming Pool
Type of Swimming Pool Heaters
The Swimming Pool Energy-Saving Suggestions
Swimming Pool Automatic Controls Accessories
Type of Swimming Pool Heaters There are three main types of pool heaters.. Open-flame fired with gas or oil, and immersion using electricity are discussed here. Solar heating is covered in the topic of its own.Open-flame Swimming Pool HeatersThe most commonly used, open-flame heaters are available for any size residential swimming pool. Because gas heaters are the worldwide most popular, manufacturers have developed high-efficiency gas heaters for swimming pool use. Advances in the design of the heat exchanger (through which the pool water passes) and the combustion chamber, as well as the use of electric pilots and narrow range thermostats, have increased heater efficiency by about 15 percent.You will find three variations of open-flame heaters – coil, tank, and convection. Coil Heaters, also known as flash heaters, present a small, fast-moving volume of water to a large flame. They work very fast and can be used in any size swimming pool. Tank Heaters, similar to your home hot-water heater, present a large volume of slow-moving water to a small flame. They have long recovery periods and are not very efficient in cold climates, but they are less expensive than coil heaters. Their use is limited to small pools and spas. Convection Heaters, are a hybrid of the other two and sometimes incorporate a booster pump. They use a large flame to heat slow-moving water. Relatively inexpensive, they're limited to small swimming pools and spas. Electric HeatersSimilar to a gas-fired tank heater but with electric heating elements immersed in the water, electric heaters work slowly, especially when large volumes of water are involved. They are practical only for small pools and spas. Electric heating in Thailand means mostly that you need to upgrade the whole electrical system for the house. Due to poor wiring and fuse boxes. Before deciding on an electric heater, check that your electric service can handle it.What size Heater?The sizes of gas and oil heaters are indicated in British Thermal Units (BTUs). A BTU is the amount of heat required to raise the temperature of one 454 milliliter (1 Pound) of water one degree Fahrenheit. Most of the heat loss from a pool is from the surface; it takes about 12 to 15 BTUs an hour to raise the temperature of a square 30cm of pool surface water that much.You can calculate the number of BTUs required to heat your pool. First you need to know the mean temperature of the coldest month in which you'll use it, the temperature you want the water to be, and either the surface area of the pool or the number of liters that it holds. Then factor in the heater efficiency to arrive at the BTU/hour input to the heater. This is the way that all heaters except electric ones are rated. Electric heaters are rated in kilowatts input, one kilowatt equaling 3412 BTUs. |
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