The match between a heat pump water heater and a conventional tank storage water heater is even more unbalanced as the constraints imposed by thermal regulations prohibit the second one in the new housing.
The statistics in Europe show a daily average consumption of 40 to 50 litres of hot water at 55°C per adult (30 L for children). Currently, a heat pump water heater consumes, in average, between 2 and 3 times less electricity than a conventional water heater according to the surrounding environmental conditions.
This table does not take note of the arrival of new electric multi-tank water heaters, allowing to heat only a certain amount of water according to the needs. The heat pump water heater is especially interesting for large capacities (250 litres to 300 litres) as its COP (coefficient of performance) falls with lower capacity.