... ,400L,500LHeat collector working temperture: -35-200Electrical heater: 45-65hotwater temperature: 50-75Pressure-endure ability:0.6MpaThe advantage of the product ... cold area,It still can work in - 35 degree low temperature,and the heat pipe work as normal operation,the tube ... tank in indoor does not ice up.under the low temperature, the system efficiency be higher than the ordinary solar energy.The ...