FWPC instantaneous domestic hot water tanks come with a single control system with proactive primary flow rate control by simultaneously activating valve and pump to ensure a low return temperature in order to enable condensing in the boiler. They are equipped with a double, modulating, low consumption pump, which is thermally insulated. Combined with a primary storage tank and our condensing boilers, they optimise the efficiency of the hot water production system in an installation whilst enabling contributions of renewable energies (HP or solar).