Flatbedford said:woodgeek said:I haven't ever seen or run one of those rocks --but simple math shows they are not masonry heaters...
The heat capacity of the stone might store 15-20 minutes of output (while a heavy steel stove could probably store 10 minutes). So, there might be a 5-10 minute extra lag on startup, and 5-10 minutes of extra heat a couple hours later, doesn't sound like a big (or even noticeable w/o confirmation bias) difference. As for 'spikes', I have never seen my stove 'spike' over a time scale shorter than 40 minutes, I don't think the extra 10 minutes of storage is going to spread or 'soften' that out much. I expect much of the positive testimonials are more related to differences in convection/radiation heat xfer and radiant surface area than 'storage'.
If some folks think they're pretty, and have the $$, they should go for it. But in a 'blind taste test', I suspect most people couldn't tell the difference in heating standing 3 feet away.
Edit: we discussed heat capacity here: https://www.hearth.com/talk/threads/42152/
You should have stopped typing after the words "I haven't ever seen or run one of those rocks" because everything you speculated beyond those words just backed them up. I only started burning my rock this season and I will tell you that it stays warm for hours after the fire has burned down. My old steel stove burned us out of the room with a fresh load of wood, but froze us about 3 hours later. A fresh load in the Fireview just keeps the warm coming. Is it worth the extra money? Based on my shopping, there was no extra money, but if there was, yes.
I have to agree. Although I participated in some of those calculations in the other thread I'm quite certain that the model that we were using to calculate the heat output is over simplified. Basically the model is assuming that the heat output is going to be at the same rate (max BTU/hr rate for the stove) for both materials. Well... I don't think this is the case. Although we may well have calculated the storage _Capacity_ correctly between the cast and soapstone stoves, the rate at which it gives up that heat and radiates it to the room has not really been (in my opinion) properly accounted for. The thermal properties of the materials are different. Observation of my own having had both a cast and stone stove burning in my home this year tells me that there clearly is a significant difference and I'm certain it isn't any sort of "I'm in love with the stove/placebo effect". My wife rolls her eyes at my passion for this stuff and she has noticed the difference so there's an independent "frankly slow1 I don't give a ****" opinion
Anyway - one simply has to experience the difference is all I can say. Whether it is better or worse depends on what you like as it is not necessarily for everyone. I can see folks who would rather have near instant full heat and even would rather have it cool off quickly. For me the long slower heat is preferable. I like that as I sit here I the stone is still radiating heat that I can feel even though the cat has long stopped burning and there is hardly a coal showing red in the stove. I know that in a couple hours the stove will likely still be too hot to touch and thus the room won't cool nearly as fast as it did with my old stove.
As to 'extra cost' - I paid less for this stove than I did for my old VC a year earlier despite shopping around quite a bit and buying it online (and that doesn't include the federal rebate). Granted that was due to a very good sale they had running, but it was what it was. My point being that soapstone itself isn't necessarily more expensive than other materials. They do tend to be in the "premium" class of stoves - you won't find them at lowes or HD (at least not yet - give them time?) for $500 at end of the season, but they aren't in the 2x the price of everything else class either.