I'm remodeling a small 1 story 760 sq ft home in MA.  It currently has electric baseboard heaters that I can leave as a backup heat source.  I have 115 sq ft of flat plate solar collectors to heat water for radiant heating, and will get either 120 or 240 gallons of storage tanks (still deciding). I have 40+ year old oak floors throughout most of the house, and I don't want to do radiant floor under them, the kitchen being the exception, I think staple up radiant floor would be perfect in there under the vinyl flooring.    99% of the discussions I see in the US is for radiant floors, or if it's ceiling or walls it's electric. Where can I find information about hydronic radiant ceiling or wall options?  Ceiling would be the easiest for me to install, I have full access to the ceilings from the attic.  Anyone have any opinions about it?  I know it's the norm in Europe, but virtually unheard of here in the states.  Is there a problem with installing floor in some rooms and ceiling/walls in others?  Also, what are my options for heating the water after the solar preheating?  Right now the only option I have is electric, but I can look into getting natural gas brought to the house if it makes more sense for a furnace.

I sell solar water heating for a living, but mostly for DHW.  Once we get into space heating, I tell them to contact an HVAC specialist.  So I'm willing to try things out and do some experimenting, this is being treated as a living lab.  I just can't be throwing money out the window.  It should be a fun project that should eventually save me money as well as give me some experience.

Any thoughts/opinions welcome.

You need a hydronic designer. Floors, walls and ceilings are done all the time. I would look to the floors first for comfort. Solar heating in MA is a stretch but radiant walls and ceiling properly designed might put a low temperature system to best use. Though much is written about radiant floor and wood problems, there is little evidence backing up claims of catastrophe. I have radiated all kinds of wood floors from weeks to a century old without ill effects.

Manufacturers CYA and you pay.

MA