How do I take advantage of a hydronic system if I have a furnace?

Install a boiler in combination with a hydronic furnace that uses the hot water from the boiler and use an indirect water heater to heat your water therefore saving lots of energy. Slowly start to switch your system to hydronic systems for example, if you have a furnace, switch to a boiler for the most efficiency and/or if you really want a furnace, install a hydronic furnace to save you money.