Hi Ray,
Glad to be a new memeber! I think we chatted last season when I was investigating rejuvinating the CDW, only to find out the real extent of the damage.
I've never been clear on the practical definition of 'burn time'. With the firebox about 3/4 full with 4 medium/smallish splits, it will cruise above 500 for about 2 hours or so, then it gradually declines to about 300 after 4 hours. If I load before bed, I always have enough coles in the morning for a warm restart.
The T4 is mainly to keep the kitchen / dining room warm. Both my wife and I work from home, and often spend a good part of our day at the dining room table with our notebooks. The chimney wall separates the kitchen from the livingroom, and the Winterwarm is on the livingroom side. It keeps the livingroom warm, and the heat wicks up the stairwell to the upstairs, but doesn't do much for the kitchen.
During our shoulder season, when it's hovering around 0 Celcius, the T4 is pretty much all we need. It will keep the kitchen at 24C, and the livingroom at 20C during the day. Our bedroom is above the livingroom, so the heat ends up there at night. When we're in the 0C to -10C range, I've been firing the T4 during the day and the WW at night. Over the holidays we had my wife's family here, and they like it 'warm'. When the temp was -10C we had both the T4 and WW running, and the kitchen was 27C! and the livingroom 23C. I almost took off my sweater! Today was an unusally cold day for Dec ... -20C. Fired up both and could keep the livingroom at 20C and the kitchen at 22C. ( This is a VERY leaky house ... we've been working on fixing the leaks for several years, but it's a big job )
The propane furnace just kicks in in the morning to bring the house up to 20C.
Don't want to hijack this thread, just thought the OP might be interested in the heating observations.
Here are a few crappy phone pics of the T4, and one of the WW for good measure.
Jonathan