Thermalec Single Phase Heater


Thermalec Single Phase Heater

Quick Find Code: 6862
MPN: 12PHR/9
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  • You can purchase a 2 year extended warranty on this product. 
  • Protects against manufacturing defects causing breakdown.
  • Free repairs for the term of the warranty period
  • In additon to the manufacturers standard warranty.
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Product Description

Thermalec -  Single Phase Heater 9 kW

Cast in BS-EN-1561-1997-ENGJL-200 iron, with a heavy fusion bonded epoxy coating impervious to chemically treated pool water, constructed in accordance with British Patent 2.092,282 Design pressure of 35psi (2.46kg/cm2) with 3/4" safety valve(s) set to operate at the maximum normal working pressure of 30psi (2.1kg/cm2) giving protection to both the heater and and the installation as a whole against over pressure. A 1/2" drain valve at the lowest point allows the heater to be left empty in winter. Flow connections consist of easily removable uPVC stub flanges into which the pipes may be fitted using suitable adhesive, as the flanges can be released easily from the heater no unions are required, nor is any form of heat sink needed. Flow direction is from left to right, but may be reversed quite simply on site following the installation instructions. 


  • Unique sprial flow
  • Heavey duty elements for longer life
  • No noise, fumes or moving parts
  • Epoxy coated

Before switching any power on, it is ensured that the heater is full of water and that water is flowing through it. The mains power is then switched on, followed by the on/off switch on the heater. A red indicator shows that the heater is powered. An amber light on the heater indicates that the filter pump is in operation. If the pump does not operate or if the pump interlock has not been fitted, the heater will not heat.    The desired pool temperature is now set using the thermostat dial. A green light on the heater indicates that the heating elements are powered and water is being heated. When the set temperature is reached, the green light is extinguished. A white light on the heater indicates that the water temperature is below the factory set safety thermostat trip level. If this temperature is reached, the heater has overheated. In this case, the safety thermostat trips and the unit is shut down. This trip must be reset manually.    In normal operation, the green light will only be lit (and heating will occur) if all the other lamps are lit and the pool water temperature is below the set temperature. 

Protection level: IP 21   
Fuses: 1 x 2 Amp (+1 spare)  
Pump interlock voltage: 230 V AC   
Element heat flux: 11.5 W/cm² max. 

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  • The construction of the heater is solid and robust, to ensure years of safe and reliable service. 
  • The watts density of the heating elements is very low (9.54 W/cm²), ensuring minimal scale build-up and long element life. 
  • The contact materials are highly resistant to corrosion from pool chemicals
  • The patented weir and baffle system inside the heater causes the water to flow through it in a spiral. This increases uniformity of the water temperature inside the heater and prevents direct impingement of cold water onto the elements. 
  • The heating elements are always submerged in water. Any air bubbles entering the heater pass through it above the water and across the unheated parts of the elements, preventing any damage to the latter. 
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