... tank does not reach Tm ax, then start the auxiliary heating device.Feature: Collector separates with storage tank. The tank ... while it reaches the fixed temperature. Multifunction: Bathing, washing, domestic heating etc; Work at anytime and enjoyable. Structure: Model No: ... Solar Keymark, EN12975-1/2, CCC, ISO9001Appliance:Domestic Hot Water Heating, Pool Heating,Radiant Infloor Heating, Air Heating.