There is waste heat doing that, but it's not really using that many pellets to keep the stove hot once it's hot. It uses a lot of pellets during startup. My theory is once I get past the startup surge, I let it run for hours and the stove gets hot like a wood stove, and warms up the floors and the walls. On auto-ignite mode, it didn't warm up the floors and walls like that, and still used about the same amount of pellets.Cool way of doing the pipe.. The room manual thing is not my favorite due to heat going outside during idle.
With the softwood pellets you use, I can imagine the stove gets really hot, and there would be a lot of wasted heat