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Indoor Pool and Spa Heating

Indoor swimming pools have the advantage of not being subjected to the weather conditions outdoors.  Yet heating indoor pools does create three needs: The pool water must be heated, the pool room must be dehumidified, and in the winter the room air must be heated.  These issues have the potential to increase energy costs.


Pool Water Evaporation and Pool Covers

Pool Cover Options, bubble or solar cover. Vinyl Cover, Insulated Vinyl CoverPools lose energy in a variety of ways, but evaporation is by far the largest source of energy loss for swimming pools. Covering a pool when it is not in use is the single most effective means of reducing pool heating costs.  Savings of 50-70% are possible.  Pool covers on indoor pools reduce evaporation (and consequently the need to ventilate indoor air and replace it with conditioned outdoor air).  Exhaust fans can be shut off as well when the pool is covered, reducing energy costs further.  Because most indoor pools are used year-round and have no opportunity to gain solar heat, pool covers can keep the pool temperatures higher without having to run a pool heater as often.

View our different selection on available solar pool and spa covers.


Indoor Pool Proper Ventilation

Tips on reducing condensation when heating your swimming pool.Swimming pool rooms require proper ventilation in order to control the indoor humidity and condensation caused by the large amounts of evaporation.  Without effective dehumidification and ventilation, you risk the appearance of mold, corrosion, structural damage and an uncomfortable pool environment.  Mold and mildew feed in warm, moist environments plus chlorine added to the warm air attacks ferrous metals and accelerates damaging corrosion.  Another issue with high humidity is wood rot.

A dehumidifier cools the air down to condense the moisture out and then reheats the air back to room temperature.  A dehumidifier provides virtually no heat to the pool or room though.


Indoor Pool Heating Options

Heat Pump for Indoor Pools

Pool Heat Pump Pool Heater for indoor poolsIndoor installation of a heat pump not only heats the pool, but provides the added benefit of dehumidification of the pool room.  Plus if a cover is used on the pool, both the humidity and the heat loss will be greatly reduced to the point where a heat pump's run time of only a few hours per day, will maintain pool temperature as well as keep the room dry.

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Gas Pool Heater |  Natural Gas or Propane

Natural Gas or Propane Pool Heaters for Indoor swimming pools and spa hot tubsAnother pool heating option is a gas operated heater.  Gas pool heaters use either natural gas or propane so they must be installed outdoors. They're most efficient when heating pools for short periods of time, and they're ideal for quickly heating pools.

Gas Heaters will NOT work as a dehumidifier as they must be installed outdoors so a separate dehumidifier would be needed.

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Electric Pool Heaters  |  Spa Heaters

Electric Pool Heater for indoor swimming poolsElectric element pool heaters are also known as tank-less heaters.  They are less expensive to buy initially and are convenient for spas because they don't take up much space and can be put indoors. 

For pools, this method is one of the most expensive methods of heating, and can cost up to 5 or 6 times more to run than a heat pump.

Electric element pool heaters are ideal for spa heaters.  They can easily be installed indoors, but do not operate as a dehumidifier, so a separate dehumidifier would be needed.

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