I am having trouble getting this heater to put out any sort of substantial heat. I plumbed it into the boiler loop with 1/2" pex tubing and I'm thinking that is the root of my problem. I have 5 zones in my system and the garage heater is the only heater on that zone. I'm getting good circulation and the boiler system is set at 180 degrees. I live in the Dakota's and it won't even bring the temp up high enough to register on a thermostat. Any ideas on what I could check or change? I'm about ready to just buy a electric garage heater and give up on using hot water? I have a two car insulated garage.... Thanks for any future replies!