The Price of Heat

Just got the price quote from Radiant Floor Company for all the supplies needed to install PEX radiant heating in the basement and first floor. The total: $8,205.25 That doesn't include installation which I'd have to do myself. It does include $3,647 for a fancy Polaris water heater. I'll have to dig up the price quote and compare it to Radiantec's. I've even thought about building my own system from scratch since Lowe's sells Zurn PEX plumbing supplies. Perhaps a few long term, cost savings charts would help clarify too.