Does anyone know if you can connect a solar hot water heater to a radiant heat system.  I bought a house several years ago that was upgraded to forced air, but the baseboard radiators were never taken out.  I believe most of the piping lines are still intact with a few missing connections.  With the price of oil, I would like to switch over to a solar system.  Anyone know if this can be done with a solar hot water heater or two?