Do I need a thermoregulator to heat and cool Mya 4? No, you do not need a thermoregulator for your Mya 4. The heating of Mya 4 heating is achieved using heating cartridges in all four zones. This provides fast and precise heating. The active cooling is provided by Peltier technology and a cooled water supply is required for the heat exchanger. Recommended Supply: Coolant Supply Mains water or ethylene glycol mix (max 30%) Max. coolant temperature 15 °C (up to 35 °C, however performance will be affected) Min. coolant temperature 5 °C Max. flow rate 5 L/min Min. flow rate 2 L/min Max. coolant pressure 2 bar Min. coolant pressure 0.3 bar If using a thermoregulator (both specs below required): Min. cooling power at 15 °C 1.5 kW Min. cooling power at 0 °C 1.0 kW