how many BTU's is it rated for? I can't tell from the ad.
This unit is meant to tie into your boiler and is not a self contained space heater that you hook up gas and electric for the fan. The unit shown requires Electric and then a supply and return run from the floor heat plus a t-stat. It would be wise to have it on its own circ pump too.
I think this probably in not what you want, but one of these would work nicely: http://www.radiantheatproducts.com/store/cart.php?m=product_detail&p=251
I'm assuming you have boilers, so why not just a fan coil unit. Cheap...easy to replace (after it rusts out) and will help knock down the fog on those cold/dry winter days.