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Designing heating system with air to water heat pump in France, near Lyon

 
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Air Source Heat Pumps (ASHPs)
Last Post by bobflux 6 months ago
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Batpred
 Batpred
(@batpred)
Noble Member Member
Joined: 2 years ago
Posts: 1161
02/03/2026 8:30 pm  

Posted by: @bobflux
↑

There should be a Darwin award for hybrid photovoltaic inverters with backup output that can only be configured via cloud app.

Just love the way you put it! 🤣 

 


8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; G99: 8kW export; 16kWh Seplos Fogstar battery; Ohme Home Pro EV charger; Vaillant Arotherm Pro 7kW; 100Amp head, HA lab on mini PC


   
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bobflux
 bobflux
(@bobflux)
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Joined: 7 months ago
Posts: 185
Topic starter 19/03/2026 1:08 pm  

The heat pump is humming along, I talked to the neighbors, they said they saw it but didn't hear it, asked if this thing is even on? Not even in silent mode, quite extraordinary.

Weather has been nice, so over the last 30 days the house drew about 40 kWh from the grid, not bad lol

The future installation schematics are finalized and I'm ordering the parts.

I figured out, my favorite electronics/schematics/PCB software can draw a schematic and make a BOM with electronic components so... why not with plumbing? Since the house is huge, there are so many parts and fittings, this is sooooo damn convenient!

image

 



   
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 Judith
(@judith)
Prominent Member Member
Joined: 3 years ago
Posts: 554
25/03/2026 9:35 pm  

Great to read this. Your application is exactly why a heat exchanger should be used. How big is it?


2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with SCOP >4) open system operating on WC


   
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bobflux
 bobflux
(@bobflux)
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Joined: 7 months ago
Posts: 185
Topic starter 25/03/2026 10:44 pm  

@judith It has about 4.5m² of stainless steel plate surface, so it's pretty large.

Today we began installing hydronic radiant ceiling panels with MLC pipe...



   
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bobflux
 bobflux
(@bobflux)
Reputable Member Member
Joined: 7 months ago
Posts: 185
Topic starter 30/03/2026 10:32 pm  

Was looking for a way to measure flow and return temperatures on manifolds.

Introducing the aliexpress stainless steel underfloor heating manifold, which has 1/2" threaded holes on top and bottom, and 1" on both ends.

So an aliexpress 1/2" thermowell can poke all the way through into the return pipe to get the return temperature for each circuit.

Cheap, convenient, quick assembly, no hassle.

image
image

A shorter thermowell can also get the temperature in the manifold.

image

 



   
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