... G11/2" / φ50mmIntelligent defrostingN/AYesWaterproof levelN/AIPX4Water flow (min./nor.) m3/h1.9/2.5Noise ... heat from the air, compared oil boilers, gas boilers, electronic boilers, it reduces operating costs ... , evaporator temperature, environment temperature and so on8). Auto-defrosting9) Widly used: widly be used in swimming ... pool heat pump, spa pool heater, spa pool heat pump water heater