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New Vaillant Arotherm Plus 7kW (cooling enabled) + Jaga Briza cooling + Sunamp Thermino – costs, experiences & Sunamp choice (EnerPHit-level retrofit)

 
Air Source Heat Pumps (ASHPs)
Last Post by asoksevil 1 hour ago
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 asoksevil
(@asoksevil)
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Joined: 2 years ago
Posts: 2
Topic starter 17/07/2026 8:39 pm   [#3106]

Hi everyone,

I’m looking for real-world advice and cost benchmarks for the new Vaillant Arotherm Plus 7kW (cooling-enabled) system with Jaga Briza fan coils for active cooling, plus some guidance on Sunamp Thermino selection.

Project background

  • London end of terraced house, approx. 104 m² after extension (2 storey house)
  • Nearly EnerPHit-level retrofit following Passive House principles (high-performance fabric, airtightness, MVHR, etc.)
  • Zehnder MVHR being installed
  • Solar PV + Tesla Powerwall 3 also going in
  • Ground floor cooling demand estimated at ~6.6 kW (further reduced with external awning)
  • Bedrooms have low loads

Proposed system

  • Vaillant Arotherm Plus 7kW (new V2, cooling enabled)
  • Heating via underfloor heating (UFH)
  • Cooling via Jaga Briza fan coil units
  • Hot water via Sunamp Thermino

Jaga Briza concealed units planned: – Living/dining/kitchen: Briza 22 (190 cm) – Study: Briza 12 – Two bedrooms: Briza 22 (75 cm each)

  • 100 L buffer vessel
  • Sunamp Thermino (undecided between xPlus and ePlus – see question below)
  • Heatmiser fan-coil controls
  • Units to be installed in ceiling / loft voids where possible

We’ve been quoted roughly £13,800 for the four Jaga Briza units supply + install (including controls). Separately we’ve obtained a direct quote from Jaga for the equipment itself at around £6,000–£6,300 (ex VAT + carriage).

Heat pump (100L buffer) + Sunamp (210L) £17,340 

Total cost of £31,140

Minus the BUS (£7,500): £23,640 

The overall package (ASHP + Sunamp + cooling) is coming in significantly higher than expected once cooling was added. We’re trying to understand whether the installation element for the ASHP and the Briza units is realistic for a London retrofit with ceiling/loft installation and full system integration.

Questions

I feel like I should get a 200L buffer for the ASHP instead of 100L and the 300L thermino instead of the 210L.

  1. Has anyone here installed Jaga Briza (or similar) fan coils for cooling with a Vaillant (or other) ASHP? How did they perform in practice — noise, response time, comfort, condensation management?
  2. What kind of installed cost (supply + labour) did you see for a similar number of concealed Briza units in a retrofit?
  3. Any feedback on the overall cost of adding active hydronic cooling to a Vaillant Arotherm Plus system?
  4. Sunamp Thermino choice: We will be pairing the ASHP with a Sunamp Thermino and also have solar PV + Tesla Powerwall. Should we go for the xPlus (heat-pump optimised) or the ePlus (more PV/off-peak focused)? Any real-world experience with either in a similar setup would be really helpful.
  5. Any tips on coordination between the ASHP installer and the fan-coil installation (pipework, drainage, controls, heating/cooling changeover logic)?

We’re keen to keep the system as one coherent package if possible, but want to make sure the pricing and component choices are sensible before we commit.

Any experiences, cost data, or lessons learned would be greatly appreciated. Happy to provide more technical details if useful.

Thanks in advance!


This topic was modified 1 hour ago by Mars
This topic was modified 1 hour ago by asoksevil

   
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