The system consists of two cylinders in a single body: the upper tank is a calorifier for the production and storage of domestic hot water (DHW) equipped with a high efficiency heat exchanger that can be powered by a heat pump, while the lower tank is a primary water buffer store for the heating system that is also fed by a heat pump. The calorifier body is available in stainless steel (mod. TW1X) or glass lined steel (TW1V), the buffer store is made only in carbon steel. Twin represents a very a cost effective and compact solution that allows to have a complete system by reducing space and installation costs. It is also prepared to host a backup immersion heater (not supplied).
