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Electric Resistance Heater

See also: Categories, Swimming Pool Equipment, Pool Heating

Definition

An electric resistance heater operates independently of air temperature, so it can easily heat the spa during winter months. Electric resistance heater is the most compact heater. As many occupy less than 12 ft3, they are ideal for areas with space restrictions like spas.

How does it work

An electric resistance heater creates heat by applying an electrical current to a metal resistor, which acts as a heating element. The metal resistor extends throughout assembly housing inside the unit. The metal resistor heats when a current is applied to it. The spa water enters the assembly housing, washes over the resistor, heats, and exits the assembly housing warm.

Advantages of Electric Resistance Heaters

An electric resistance heater operates independently of air temperature, so it can easily heat the spa during winter months. Electric resistance heater is the most compact heater. As many occupy less than 12 ft3, they are ideal for areas with space restrictions like spas.

  • Low purchase and installation costs
  • Operate independently of air temperature.
  • Environmentally friendly: emit no air pollution, small environmental footprint quiet operation
  • Occupy very little space, with most occupying less than 12 ft3

Disadvantages of Solar Heaters

  • Expensive to purchase
  • Dependent upon sun: cannot operate at night and operate less efficiently in cloudy weather
  • Heat pool water slowly
  • Unattractive installations on swimming pool owner’s roof or lawn

Disadvantages of Electric Resistance Heaters

The efficiency of a swimming pool or spa heater is measured by its Coefficient of Performance (COP). The COP of an electric resistance heater is 1.00, which makes it six times less efficient than a heat pump. Due to its low efficiency, an electric resistance heater requires large amounts of electricity to heat a body of water. In fact, electric resistance heaters require so much energy that they are not generally used to heat swimming pools. They are primarily used to heat spas and small therapy pools.

  • Expensive to operate because they require large amounts of electricity
  • Expensive to install: require heavy-duty wiring and large-amperage circuit breakers
  • Not energy efficient: Coefficient of Performance (COP) of 1.00





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