Awhile back I was considering installing a radiant floor, as friends have highly recommended their inexpensive heating capabilities during the winter. Rusty, my neighbor, renewed that idea when he suggested the same and took it a step forwards by offering to help me install it. Rusty has some experience after installing radiant heating beneath his poured adobe floor on his own house. He happened to have some pex pipe on hand. Pex is a great durable water pipe that is also inexpensive. It's flexibility makes it easy to shape. The pipe will move hot water underneath the floor, which will then conduct through the floor and into the interior space, providing free heating in the winter. A solar water heater on the outside of the dome will provide the heating mechanism.