The big question is how much heat is needed for the floor system? Solar is probably a non-starter but without knowing the exact numbers, one cant just rule it out. Depending on the needs you maybe able to make it work with your Rinnai system, install another water heater, or you just might have to install another boiler. For more: http://blog.sls-construction.com/2012/common-sense-radiant-heat-faq
Is it possible to heat a radiant floor with solar?
Is it possible to heat a radiant floor with solar?Asked by Boo Brogden
I have a radiant floor system that was run by a SeaHorse boiler which is no longer made and no longer works. I do not need it to heat domestic hot water as I have a Rinnai for that. I am trying to find a new heat source for the floor ONLY and I only need it in winter.