116 Utilisation of solar energy for domestic hot water and central heating Heat pump (environmental heat) Auxiliary energy (electricity) 2,500 2,000 1,500 1,000 500 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec kWh Monthly energy consumption of an average detached house Pressureless (drain-back) solar system (ETSH*, ETSX*) J The solar collectors are only filled with water when sufficient heating is provided by the sun J The pumps in the control and pump unit switch on briefly and fill the collectors with storage tank water J After filling, water circulation is maintained by the remaining pump 1,891 mm = 300 L 1,895 mm = 500 L 625 mm = 300 L 790 mm = 500 L 595 mm = 300 L 790 mm = 500 L Polypropylene tank New controller display Hydraulics Outdoor unit connection Floor standing unit with integrated ECH2O tank This model is the most compact unit but needs to be with a separate tank to deliver domestic hot water. The ECH2O unit is equipped with a thermal DHW tank of 300 or 500 L that can be connected to thermal solar panels. Floor standing air-to-water heat pump for heating and hot water with thermal solar suport: ETSH units Floor standing air-to-water heat pump for bivalent heating and hot water with thermal solar suport: ETSHB units Floor standing air-to-water heat pump for heating, cooling and hot water with thermal solar suport: ETSX units Floor standing air-to-water heat pump for bivalent heating, cooling and hot water with thermal solar suport: ETSXB units Pressurised solar system (ETSHB*, ETSXB*) J System is filled with heat transfer fluid with the correct amount of antifreeze to avoid freezing in winter J System is pressurised and sealed 2 3 4 1 System diagram: Integrated solar unit 1 Use of solar energy for domestic hot water and central heating 2 External heat pump unit 3 Solar thermal collectors 4 Solar pump station
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