The Arkaya solar assisted heat pump functions with the refrigerant either (R134A OR R407C) which are environmentally friendly and worked up till  -35 degrees Celsius. 
The solar assisted heat pump had two primary cycles one being the water cycle and the other one being the refrigerant cycle.
The refrigerant liquid goes through the expansion valve in the Arkaya's solar assisted heat pump where the pressure on the refrigerant liquid is released and then refrigerant at -35 degrees Celsius. This refrigerant at -35 degrees Celsius goes into the solar thermal collector where it gains temperature depending on the ambient temperature. If it is seven degree Celsius which is the MCS standards than refrigerant liquid will increase the temperature up to 42 degrees, this temperature than will go into the Arkaya's solar assisted heat pump in semi gas semi-liquid form. This then will get compressed by Hitachi high heat compressor specifically designed for heating up to optimum temperature of 65 degrees Celsius which will turn the refrigerant into gas form and then this heat will get transformed into titanium coil in coil heat exchanger. This cycle will keep on repeating until the whole cylinder has been heated up to 60 degrees temperature as sensed by the electronic sensors in the solar box.
The second cycle is the water cycle in which cylinder first gets filled from the main supply. This water then leaves the cylinder and is circulated by the circulation pump into the heat exchanger in Arkaya's solar assisted heat pump. Then the titanium coil in coil heat exchanger transfers the heat of the refrigerant which is in gas form to the water and then this hot water leaves the solar box and is circulated back into the cylinder until the cylinder water reaches the optimum temperature of 60 degrees.
The Arkaya's solar assisted heat pump although also has a backup option in which urgent need of hot water the solar box heats the water up with the electric element which is set up at 35 degrees Celsius. This facility allows the Arkaya solar assisted heat pump to heat water using the electric element and allows the machine to meet all the needs of hot water whether urgent or not so in any weather condition through the 24 hours in a day.

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