ᐅ Manufacturer for air-to-water heat pumps and ventilation systems wanted

Hello!

We are planning a solid KfW70 house.
We have chosen an air-to-water heat pump as well as a ventilation system.

We have noticed that some well-known manufacturers offer combined units that include the heat pump, ventilation, and water storage.
What is your opinion on this? Is it better to have separate systems or an all-in-one device?

Tobiax

Tobiax schrieb:
...We are planning a solid KfW70 house.
We have decided on an air-to-water heat pump as well as a ventilation system.

Whether an air-source heat pump is actually efficient in a KfW70 house should be verified by an external expert ;-)

Tobiax schrieb:
...What is your opinion on this? Preferably separate units or an “all-in-one” system?

Anyone with basic intelligence can answer this question themselves! Combined systems always mean a compromise when it comes to energy efficiency due to competing demands ;-) However, they are usually cheaper to purchase and often preferred by general contractors because the total cost is what matters most to them ;-) Actual cost-effectiveness is less of a priority since future excessive operating costs are not part of the contract ;-)

Best regards

€uro schrieb:
Whether an air-source heat pump is actually effective here, given the KfW 70 standard, should be checked by an external expert ;-)

May I ask what you mean, especially regarding KfW 70?

Thank you in advance for your response.

TripleB schrieb:
May I ask what you mean, especially regarding KfW70?

A KfW 70 standard has a higher heating energy demand than buildings with better insulation. The higher the demand, the more important a high seasonal performance factor (SPF) of the heat pump becomes. For air-source heat pumps, the SPF tends to be lower for various reasons compared to, for example, ground-source heat pumps. In buildings with low demand (well to very well insulated buildings; mild climate locations), this plays a less significant role than in moderately insulated buildings in colder climates. In individual cases, the actual demand (power, energy) for heating and hot water should first be determined to clarify the situation. However, please note that these are not the results from energy-saving regulations or KfW calculations.

Kind regards.