ᐅ Which air-to-water heat pump to choose (sizing, storage, etc.)

Hello everyone,

based on the data below, could you provide recommendations on which air-to-water heat pump, in terms of sizing and technology type, would be best for us?

Annual primary energy demand: 42.29 kWh/m2 (14.5 kWh/ft2)
Annual final energy demand (absolute) Energy carrier 1 Electricity special tariff: 4333 kWh
Annual final energy demand (absolute) Energy carrier 2 Electricity auxiliary energy: 595 kWh
Transmission heat loss: 0.33 W/(m²K) (0.058 Btu/(ft²·h·°F))

The plan is for an air-to-water heat pump with a 170-liter (45-gallon) buffer tank and an indirectly heated hot water storage tank of 250 liters (66 gallons).

Can you provide recommendations based on this information, or do you need further details?

No – but try searching for "crink's heating load tool," you'll find everything there.

You don't need the consumption, but the maximum heating load of the house: transmission heat loss plus ventilation loss at the design outdoor temperature. The heating load is also indicated on the energy certificate, but it is not always accurate there.

An H't value of 0.33 is not outstanding; there might be room for improvement in the insulation.

Hot water tank: 200–300 liters (50–80 gallons). As small as possible (for hygiene), as large as necessary (many people, large bathtub, etc.). Large heat exchanger. We have a 200 L tank for up to 4 people but rarely take baths. Currently, with two people, we only heat the tank once a day.

No buffer tank for the heating circuit => google