Our 750 sf house with vaulted cielings and poor insulation has a Dovre freestanding gas heater. It takes hours to heat the place up and it never gets toasty, just not freezing like outside. So we want to upgrade. Here's the thing though. I beleive the model is a DV400, rated with a max BTU output of 30,000. We've been to three retailers and all of the models they have shown us are rated the same. I get the feeling the Dovre is an off brand piece of junk, but I dont wanna spend the money on a new stove to be stuck in the same situation. Any advice?