ᐅ Air-to-Water Heat Pump: Choosing Between Viessmann and Ochsner

Hello dear community,

we have two air-to-water heat pump offers for our semi-detached house:
1. Viessmann Vitocal 200-S 201.E10 with 7.4 kW
2. Ochsner Air Hawk 208 C11A

The most important factors are trouble-free operation and reasonable service.

Key data about the house:

• Semi-detached house, built with solid construction, not a KfW-certified house (roughly equivalent to a KfW-60 standard)
• Two full floors plus basement, ground floor + upper floor 68 + 68 sqm (732 + 732 sq ft), plus about 30 sqm (323 sq ft) of heated basement area
• Underfloor heating, controlled ventilation system with heat recovery and enthalpy heat exchanger
• No photovoltaic system installed primarily

Do you have any experience with either of these? I could only find rather negative reports about the Vitocal.
The installation company mainly works with Viessmann systems and recommends it specifically, but they can also install the Ochsner unit.

Thanks a lot!
Best regards

NilsHolgersson schrieb:

We have two air-to-water heat pumps offered for our semi-detached house:
1. Viessmann Vitocal 200-S 201.E10 with 7.4 kW
2. Ochsner Air Hawk 208 C11A

Are you seriously saying that you have Z.E.R.O. two options for the delivery of a heat pump in times like these? — I keep hearing from people who have to wait an unknown time just for the usual household quantity of “1 unit”…

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https://www.linkedin.com/company/bauen-jetzt/

Viessmann is already out, as it is clearly oversized. That doesn't leave many options remaining.

11ant schrieb:

Are you seriously saying that you actually had T.W.O. options for the delivery of a heat pump “in times like these”? I keep hearing from people who have to wait for the usual household quantity of "1 unit" until "who knows when"...

That’s what the construction company or installation company said. Construction start in Q3, installation in 2024.

KarstenausNRW schrieb:

Viessmann is already out, as it is clearly oversized. That doesn’t leave much else.

The heating load calculation is still pending, but – roughly estimated: the new building according to the 2016 Energy Saving Ordinance has a heating demand closer to 0.05 kW/sqm (0.05 kW/sqft), with about 165 sqm (1776 sqft) of heated area: 0.05 x 165 = 8.25 kW. The Viessmann pump has 7.4 kW. Why is it considered oversized? Just trying to understand 🙂

NilsHolgersson schrieb:

This is what the construction company or installation contractor calls it. Construction start in the third quarter, installation in 2024.

So, they are basically betting that the supply bottlenecks will be resolved by then (?)

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/