Pool & Spa Heaters

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Pool and Spa Heaters Selection Tips :

In any type of facility, to ensure the well-being and comfort of swimmers, it is important to maintain the pool or spa at a convenient temperature. Studies showthat, depending on the conditions and the intended use, the ideal pool and spa temperatures should be within 27–29 °C and 40–43 °C ranges, respectively.

That said, a heating system is necessary to provide the thermal comfort by elevating the water temperature to compensate for thermal losses due to heat transfer from the surface and through the basin.

In the case of several private (apartment) facilities, a central heating system is used to support the spa or the pool, as well as supplying water for consumption. It must be noted that an excessive increase in water temperature exacerbates evaporation and elevates the relative humidity in the pool. This is also detrimental to the pool equipment.

pool and spa heaters

The ambient temperature is required to be maintained 2–3 °C above the water temperature to limit the evaporation rate. Accordingly, a thermostat (ecostat) is placed at the inlet of the hot water in circulation.
 

Effective Factors in Calculating the Required Heating Capacity

When calculating the heating capacity and deciding on the type of heating system for the pool or spa, the following must be taken into consideration:

  • The volume of water in the basin
  • The surface area of the basin (the total free surface of the water)
  • The time required to reach the initial temperature (often assumed 24 hours)
  • The final pool water temperature, which often turns out to be between 80–86 °F (27–30 °C) depending on the intended use and other conditions
  • The average temperature in the coldest month of the year (to calculate the thermal load for outdoor pools)
  • The average temperature in the room (to calculate the thermal load for indoor pools)

Notice: The (cold) input water temperature, before heating, is often assumed to be 41–46 °F (5–8 °C).

Calculating the Required Heating Capacity for a Pool or Sp...

Pool and Spa Heaters Selection Tips :

In any type of facility, to ensure the well-being and comfort of swimmers, it is important to maintain the pool or spa at a convenient temperature. Studies showthat, depending on the conditions and the intended use, the ideal pool and spa temperatures should be within 27–29 °C and 40–43 °C ranges, respectively.

That said, a heating system is necessary to provide the thermal comfort by elevating the water temperature to compensate for thermal losses due to heat transfer from the surface and through the basin.

In the case of several private (apartment) facilities, a central heating system is used to support the spa or the pool, as well as supplying water for consumption. It must be noted that an excessive increase in water temperature exacerbates evaporation and elevates the relative humidity in the pool. This is also detrimental to the pool equipment.

pool and spa heaters

The ambient temperature is required to be maintained 2–3 °C above the water temperature to limit the evaporation rate. Accordingly, a thermostat (ecostat) is placed at the inlet of the hot water in circulation.
 

Effective Factors in Calculating the Required Heating Capacity

When calculating the heating capacity and deciding on the type of heating system for the pool or spa, the following must be taken into consideration:

  • The volume of water in the basin
  • The surface area of the basin (the total free surface of the water)
  • The time required to reach the initial temperature (often assumed 24 hours)
  • The final pool water temperature, which often turns out to be between 80–86 °F (27–30 °C) depending on the intended use and other conditions
  • The average temperature in the coldest month of the year (to calculate the thermal load for outdoor pools)
  • The average temperature in the room (to calculate the thermal load for indoor pools)

Notice: The (cold) input water temperature, before heating, is often assumed to be 41–46 °F (5–8 °C).

Calculating the Required Heating Capacity for a Pool or Spa

QT = Q1+Q2

 

Q1 = mCp∆t/t

  • QT = Required heating capacity.
  • Q1 = Required thermal energy to heat up the pool in BTU/hr (British Imperial unit).
  • m = Required mass of water (m = ρv), where ρ is 8.3 lb.gal and v is the volume of water in the pool in US gallons. 
  • Cp = Specific heat of water, which is 1 BTU/lb. °F.
  • ∆T = The difference between the cold water temperature and the desired temperature in degrees Fahrenheit (∆T is smaller for indoor pools and is calculated based on the employer's demand—in the 40–45 °F range).
  • t = Time to reach the final water temperature (h).  

Q2 = UA∆t

  • Q2 = Heat dissipated from the free surface of the pool (BTU/hr). 
  • U = The overall heat transfer coefficient from the surface, which is 10.5 BTU/h. 
  • A = The total surface area of the basin.
  • ∆T = The difference between the water and room temperatures in degrees Fahrenheit.

Calculating the Water Heating Capacity for Indoor Swimming Pools

pool and spa heaters

  • Tf = The final pool water temperature, which often turns out to be between 80–86 °F (27–30 °C) depending on the intended use and other conditions;
  • Ti = The input water temperature, before heating, which is often assumed to be 40–46 °F (5–8 °C).
  • Q = The boiler power in BTU/hr.

Maximum Heating Time = Boilers and heat exchangers with a higher power output are required to complete the heating process in a shorter time. This parameter is defined as the time needed to bring the cold water to the desired temperature.

For swimming pools used for recreational purposes (once a week, such as pools in villas and vacation houses), the required time for heating is around 24 hours. However, for pools that need to be brought to temperature once every season, the preheating can take up to 48 hours.

Unit Conversion Table

pool and spa heaters

The rule of thumb for calculating the electric power consumption by the pool heater and the heat generation capacity is as follows:

pool and spa heaters 

Pool and Spa Heating Methods

  1. Heating using a boiler (cast iron or steel) and a heat exchanger (shell-and-tube or plate type).

    pool and spa heaters

  2. Heating by electric heaters.

    pool and spa heaters

  3. Heating by special, gas-fired pool heaters.

    pool and spa heaters

  4. Direct and Indirect heating by solar-powered pool heating systems.

    pool and spa heaters

  5. Heating by heat exchangers.

    pool and spa heaters

Heat Exchanger

Overall, heat exchangers are the most common water heating equipment for pools and spas and are available in shell-and-tube and plate types.

Heat exchangers used to warm up water for pools and spas must offer high thermal efficiency, as well as corrosion resistance. This is best fulfilled by all-steel heat exchangers. Heat exchangers have two separate circuits, one for circulating hot water or vapor coming from a boiler, and the other for cold water to be indirectly heated via the hot water supplied by the boiler.

Typically, separate heat exchangers are employed to supply hot water to pools, spas, and for consumption.

pool and spa heater

Reducing Energy Consumption by the Pool Heater According to studies, the free surface of the pool accounts for approximately 60–70% of the total thermal dissipation. Therefore, arrangements to limit the loss can be effective in reducing heating and fuel costs. One of the most effective approaches in this regard is to use thermal pool covers for periods of inactivity to save energy and maintain water temperature (similar to a blanket) and also prevent the contamination of the water (in open-air swimming pools).

Placing an Order and Warranties for Pool and Spa Heaters

  • Offering best price guarantee for all products, the prices for pool and spa heaters presented by DamaTajhiz are up-to-date and discount-included (see Best Price Guarantee at DamaTajhiz.com).
  • At DamaTajhiz.com, we provide all the information you need, as well as guaranteed unbeatable prices, for several models of pool and spa heaters from reliable manufacturers, with original warranties, to bring you the thrill of an ideal, intelligent purchase.

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Short Introdution

Since 2003, DamaTajhiz Online Store has been active in the supply of all types of heating, ventilation, and air conditioning (HVAC) equipment by management of Mr. Majid Zavvarian to meet needs of construction projects and consumers in the Middle East.

Investigating new methods of e-commerce and looking ahead to the future, DamaTajhiz Online Store designed its way of success as the first startup for selling installation equipment in Iran and the Middle East in 2004 by launching the most comprehensive specialized shopping website for all types of heating, ventilation, and air conditioning (HVAC), pool, sauna, and spa bath equipment.


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