I've got a Hardy, installed it myself 6 years ago. use it to heat my 40X60 shop and the house has 3500 sq ft of radiant tubing under the basement slab and house garage. also have a radiator over top of the A coil in the furnace to heat the rest of the house. they're easy to hook up, took a little bit to figure out the thermostat since I've only got a single stage one. if you need any help let me know.