I have seen both of these cast-iron gas stoves. Here are the stats for them: Quadra-Fire Topaz BTU Input NG: 26,500 - 39,500 Top Vent BTU Input LP: 30,500 - 38,000 Top Vent Efficiency: up to 85% Convection Blower: 160 cfm Weight: 275 lbs. Vermont Castings Radiance BTU Input High: 35000 LP & NG BTU Input Low: 27,000 LP/25,000 NG Steady State Efficiency Rating: 81.5% LP/82.7% NG AFUE by D.O.E. Efficiency: 71.1% LP/71.6% NG EnerGuide Ratings Fireplace Efficiency: 60.7% Optional Convection Fan: 150cfm Weight: 350 lbs. Now, I don't know what all these numbers mean. But it looks to me like the QF Topaz has a little more BTU power, but the VC Radiance is 75lbs heavier. This is probably due the to fact the the VC Radiance has a cast-iron firebox, whereas the QF Topaz has a steel firebox. Wouldn't that equate to the VC Radiance having more thermal mass (for radiant heat) and holding the heat for longer than the QF Topaz? And wouldn't that extra thermal mass make the VC Radiance a more powerful stove overall? We will be using Liquid Propane. I am trying to decide which is a better gas stove (quality and power). Any information will be appreciated. Thank You.