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Pahlen Pool Heat Exchangers

santorini grace infinity pool

Most home owners don’t realise that a highly efficient central heating appliance used for underfloor or radiator central heating purposes can also be used to heat a pool. Pahlen pool heat exchangers allow the cost sharing of the same plant and equipment put in place for heating and domestic hot water duties. This reduces the overall cost of an installation because the one piece of equipment can be used for multiple applications - all operating at very high efficiency.

Related Product: See our line of Central Heating Systems

A heat exchanger is used to transfer heat energy from one medium to another without the two media being mixed. Pahlén heat exchangers with cross flow operation produce high output and have excellent heat transfer capability. They can be installed and connected to gas, diesel, wood, pellet, electric and solar panel systems.
Pahlén heat exchangers

The Pahlen range from Sweden is optimized for high capacity and low pressure drop, greatly simplifying the installation of the heat exchanger to the pool circulation system. The cross flow design passes the hot primary circuit water in the opposite direction to the cooler pool water to give maximum output.

The heat exchangers are designed and made of materials that permit their use for a wide variety of needs and in many different types of installations.
Central Heating Nz: heat exchangers

The standard version chlorinated pools is made of thermoplastic with a high glass content for extra durability, and with a spiral of AISI 316L  acid-resistant stainless steel coil.
Central Heating Nz: heat exchangers

The titanium version for salt chlorinated pools is made of thermoplastic with a high glass content for extra durability, and with a spiral titanium coil for protection where there is a high risk of corrosion.

In each type there are two sizes;

  • 40kW for medium pools up to 70m³
  • 75kW for large pools up to 130m³

When considering the sizing of heat exchanges for pool applications we normally look at reheat times. First we look at how fast the selected heat exchanger can raise the temperature in the pool per hour then we estimate how many degrees per day the pool loses. Using this we can calculate how many hours per day you have to heat the pool to keep it at a constant temperature.

For example a 70m³ pool capacity and 40kW HXP we can raise the pool temp by 0.5ºC per hour. Knowing a covered, insulated outdoor pool will lose 1-2ºC per day the pool heating system will need to run 2-4 hours per day to recover the lost heat and keep the pool at a constant temperature.

It’s worth noting 70% of the total heat loss from a pool is actually caused by evaporation so a simple pool cover even with no insulation properties will reduce the heat loss from a pool by at least 50% ref:

Call us for advise on how best to heat your pool or for help integrating your existing central heating system.

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