Vaillant's own 45 litre buffers designed specifically for their aroTHERM plus range of heat pumps. These wall hung buffers have 6 connections so can be used for hybrid or cascade systems. With factory fitted insulation and case for a professional finish. The buffer also has a sensor pocket to enable smarter control of heat pump output when used with an aroTHERM plus. The pack contrains the buffer, 4 fittings to convert from the buffer connections to 28m pipework and a VR10 temperature sensor.