Jotul 602 V3

[begreen]

okay. That's all fuel mass has been exhausted (weight back to zero).

So less than a pound per hour, pretty nice!

Yes, if I could achieve that in a tiny house on a regular basis I'd be pleased.

 

[stoveliker]

okay. That's all fuel mass has been exhausted (weight back to zero).

So less than a pound per hour, pretty nice!

Though the actual burn rate will be higher as this less than 1 lbs per hour is averaged over the burn time, and extending that to the very last gram of fuel being consumed is a stretch.
If I do the same on my BK I think I'll reach a full 3 days of burn time (and associated low average BTU output and fuel consumption) given that I have coals left over after 60 hrs...

 

[begreen]

The lowest tested BTU output on the same tests for BK stoves was around double the low output of this stove IIRC. I think the next lowest is the Fireview. If the F602 can repeatedly perform well at this low output, it will be a winner for the small space crowd. With the tax credit it's almost free.

 

[stoveliker]

Are you saying the minimum number mentioned by BK in their marketing the number is resulting from this same test?

I'm not sure how to reconcile that with having significant (but buried) coals a good 60 hrs after I started the fire.

Maybe the test using "no-ash" fir vs the wood I use...?

 

[begreen]

Are you saying the minimum number mentioned by BK in their marketing the number is resulting from this same test?

I'm not sure how to reconcile that with having significant (but buried) coals a good 60 hrs after I started the fire.

Maybe the test using "no-ash" fir vs the wood I use...?

I haven't read their marketing material, just the EPA reports for one or two models using a fixed fuel charge, not a full stove. It's the lowest output that the testing could achieve at the lowest air setting over the period of the test.

 

[stoveliker]

Yes, my point is that it's not a realistic low output for practical considerations as they average the total output over the time it takes to have zero weight left. That last 25% of that duration, the output will be like that of a candle, drawing down the average heat output advertised. Meaning that 75% of the time the output will be significantly higher.

Anyway, it's good for smaller homes that a small stove like this performs well.

 

[begreen]

Look at the measured stove temperature over the 6 hr duration of run #3. It's remarkably consistent with just a 30º swing from 287 to 257º. Averaging 273.6º for the duration. I don't think my electric space heater is that consistent. If it performs like this in real world use it will be a game changer for small space heating. I'd like to change out my old 602 in the greenhouse if I can get the credit.

 

[stoveliker]

The tables I saw were only for the first 65 minutes, and still had 1.5-2lbs left. But I didn't scan all 300 pages.

They had 6 runs or so with 1 that lasted 6 hrs and the rest much shorter.

Which page shows the long run with both weight and avg stove temp?

 

[begreen]

Two different tables. Not sure if any page combines them. The stove temp data is the most granular.
The run length varies with the air control setting. Run 3 was with the air control closed.

 

[Todd]

I’m sure the numbers will be a little higher with a normal load of cordwood than the 2x4 crib wood they used in the test. If it can go 6 hours on 2x4’s I bet it could go 8 with tightly packed cordwood. It has a secondary bimetallic air control which is why it seems to have better control and a more even heat.

 

[begreen]

If it works well over time it will be a big improvement. I compare this to our old 602 where temperature swing over 3-4 hrs was the name of the game.