We brought our new Reflection 303 home last night. During our walk through the rep said to hook up the water hose, turn the faucet in the sink on hot and turn on the water and heater. He said water would flow to fill the water heater and once full hot water would then begin to flow from the faucet. We did this and are running nothing but cold water. I checked outside to see if there was another on/off switch that I might have missed but can find nothing. The only complicating factor in this would be the very cold temperatures here in the DFW area the last few days that have had us leaving a the water on to keep the hose from freezing. We had been doing this in the 230 that we traded in the days leading up to the purchase with no hot water problems. I have tried running the heater on electric and gas with no results. Any ideas what I am probably missing?