ᐅ Which brine-to-water heat pump: Viessmann, Nibe, or Stiebel WPE-I 10 H?

Created on: 10 Mar 2024 08:32
A
Alrico1
Hello,

my two-family house (KfW40 standard, over 300 sqm (3,230 sq ft) of living space with underfloor heating) will be connected to cold local district heating (raw water), and the question is which brine-to-water heat pump (with passive cooling function) is optimal. I can freely choose between Viessmann, Nibe, or Stiebel. The heating capacity should be at least 9 kW. The installer initially recommended a Stiebel brine-to-water heat pump WPE-I 10 H 400 Plus with a sound power level of 44 dB(A). Are there any experiences with this or good alternatives?

Good luck, Alrico1
S
Stephan—
24 Mar 2024 09:30
Meltem Heat Recovery II – am I correct in understanding from online sources that it is a decentralized system?

Make sure to have a central mechanical ventilation with heat recovery installed.

Actually, the mechanical ventilation system and the heating usually do not need to communicate with each other, unless you are an expert and want to optimize everything.
Normally, the mechanical ventilation quietly runs through its settings throughout the year and does not concern itself with what the heating system is doing.
A
Alrico1
24 Mar 2024 09:59
The Meltem Heat Recovery II system is somewhere between centralized and decentralized. With 2 units, we supply an entire floor through flexible ducts in the ceilings, which then provide fresh air to the supply rooms (bedrooms and living rooms) and extract air from the exhaust rooms (kitchen/bathroom).
R
Rübe1
24 Mar 2024 10:51
Hmm, if I’ve read that correctly, these units have an air flow rate of 100 cubic meters during intensive ventilation. For a living area of 300 m² (3,230 sq ft) with a ceiling height of 2.50 m (8.2 ft), two devices—one at the front and one at the back—won’t be enough. I would first do a proper ventilation plan and then choose the unit accordingly...
A
Alrico1
24 Mar 2024 14:16
The ventilation system has been planned. Two units for every 100 sqm (1,076 sq ft) have been scheduled, so six in total.
R
Rübe1
24 Mar 2024 21:15
So, what now? 200 or 300 sqm (square meters)? Even with 200 sqm (square meters) and a ceiling height of 2.50 m (8 ft 2 in), the two only just manage to reach the absolute minimum air exchange rate of 0.4, and only with full pull and great effort.
A
Alrico1
24 Mar 2024 21:44
There was no mention of 200 sqm (2,153 sq ft).

6 devices each with a maximum air volume of 100 m³/h (59 cfm) for 300 sqm (3,229 sq ft).

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