What Is the Vaillant Arotherm Plus Air Source Heat Pump? The Vaillant aroTHERM plus is an air-to-water monobloc heat pump engineered for domestic central heating and hot water production. Utilising natural R290 refrigerant across capacities from 4 kW to 15 kW (4, 5, 6, 8, 10, 12, and 15 kW), the system achieves an ErP … Continue reading Vaillant Arotherm Plus Air Source Heat Pump