Drainback Solar System

• Pump control according to demand
• Anti-block system for the solar circuit pump
• Absorber efficiency: 95%

auroSTEP solar water heater is manufactured in a German plant which is one of the most modern plants in Europe, with exclusive Vaillant components, with maximum quality, robustness and reliability.

Our system is innovative and different compared to competitors´ products – in its function and its manner of installation. It is a well-outlaid drainback system with high efficiency. In the interior of the installation we find a solar liquid (mixture of glycol and water) and air, therefore there is no need for determined hydraulic components as for example expansion vessel, exhaust fan, manometer…etc. as there is practically no pressure in the system.

When the central control unit puts the integrated pump in function, it begins to transport the solar liquid from the serpentine of the accumulator through the tubes to the solar panels where it is heated and sent back to the accumulator to heat the stored sanitary water. During standby the solar liquid is stored in the tubes at the bottom of the system, the collector contains nothing but air. Therefore there is no loss of efficiency due to stagnation of the system, different from pressurized solar systems.

auroSTEP plus 1.150/2.250/3.350:

• Solar panels; auroTHERM flat plate collectors VFK 135 D & VFK 135 VD
• Storage;150/250/350 litres (one & two heat exchangers - monovalent/bivalent)
• Control unit
• Safety valve
• Mounting frame for collector

• Solar water heating system with only 3 components: storage unit with integrated solar pump unit and solar control – all pre-assembled, flat plate collectors and tubing
• Well defined system combinations for standard installations – no detailed calculation required
• Solar system in 3 versions: auroSTEP plus 1.150, auroSTEP plus 2.250 and auroSTEP plus 3.350
• Storage volumes 150, 250 and 350 litres
• Pre-filled drainback system – no filling procedure for the solar circuit needed during initial operation
• Quick and easy installation: “plug ‘n flow”
• High quality for an attractive system price – best value for money