A2A + A2W ASHP or a more powerful A2W ASHP?

[puntloos]

Ha, sorry during the vacation break I haven't been paying much attention to BH, sorry. 

 

But yes, @joth got things correct, just to add a bit of colour, the main reason for going 2-system was that I couldn't find a dependable way to run FCUs off a A2W at the time I was researching it. It seemed possible in theory (and joth and others are living proof it is possible). At the time the only system that claimed it could do it all was a panasonic based system with very elaborate water routing plumbing. As such I would also imagine there would be a lot of magic, and potentially efficiency-killing switching between UFH, DHW and FCU. 

 

And, I certainly was not going to trust UFH to cool my home sufficiently, especially since I have a lot of SE-facing glass. 

 

My heat camera says the air from my FCUs is usually about 13C by the way. The FCUs I selected were very specifically the lowest noise in the industry, but that probably impacted the amount of cooling they can do, eg about 1C/hour at 5pm (so sun still there) for a 40sqm room.