I also have a boiler and hot water baseboard. When I finished the basement
recently, I installed radiant floor heat. I run 90 deg water through the
system. I have a mixing valve installed between the hot of the boiler and
the return of the loops. Water comes back at 85 deg and the boiler mixes
enough hot back in to bring it back to 90 deg. Check out
www.radiantcompany.com . They are out of Vermont. I purchased most materials
through them. They also figured out what size pex I needed, how many loops,
size pump. They also had a form you could fill out online which will give
you a better idea of cost equipment needed with no obligation to buy. Give
them a call. They were super friendy and helpful. By the way, Radiant floor
heat is the best heat I ever felt.
"Randy Bishop" wrote in message
...
Hi all:

I have a 2600 sq ft 2 story home built in 1846. I also have cast iron
radiators in both floors, which are the primary heat source. We have an
oil
fired boiler which is five years old & 87% efficient att last measurement.
We would like to convert to radiant floor heat as we have total access to
the underside of the first floor. Anyone have experience/advice on
retrofit of a radian heat system in older homes?

Randy