I am looking to install radiant heating in my single-family house (300 sq. ft.), and I am primarily interested in hydronic radiant because my calculated heat loss is likely around 10kBTU/hr, which is within the capability of my existing tankless water heater (saving me some money on setup). I can also take advantage of solar water heating and storage to help offset the heating (and cooling) cost, and SWH is less expensive than solar electric generation. Additionally, the cost to install electric radiant would be significantly higher, making an electric option more expensive up front and over time.
So with hydronic radiant in mind, I would like to know what peoples' experiences have been with ceiling hydronic radiant heating, and what tips/tricks help them work at their best.
I have played around with hydronic floor radiant, but the problem is that I don't have crawlspace access, the floor is uninsulated, and any solution (short of redoing the subfloor) will add at least 1-2" to my floor height, which is a problem.
I recently read that radiant ceilings (and walls) do exist and that they can work well, but I am skeptical since I have never encountered one. The benefit would be that such a solution would simply sit under the attic insulation I will add anyway, so it doesn't take up any more space. I can also add insulation above my subfloor without worrying about having a hydronic system on top of that too.