Just one 4 Tons (48,000 Btu/h) Daikin Altherma monobloc to handle the heating and cooling loads of a 6,500 sf passive office building located in Palo Alto, CA.
The cold water is pumped into a Messana #RadiantCeiling with about 100 hydronic RayMagic gypsum panels (www.raymagic.com).

In the picture:
Ike Ericksen and Philip Newmann