No heat from Stove ( Jotul )

[john87]

This [see below] and one of them laser thermometers might help??

 

I have a woodburner that is more of an open fire with doors than the usual sort..

 

With the doors closed, hardly any heat comes out of the thing as judged by sitting in front of it, but the flue temperature is very high [300 to 400] and the body of the thing will be about 300 if not more. I have had bits of it dull red [before i knew better..]

 

With the doors open, totally different. MUCH more heat emitted and the body of the thing [and the flue temperature] is only about 100..

 

The chimney is not lined, why on earth anyone would do this is beyond me [trying to make the sky hotter??] and so after a few hours all the brickwork right up through the house gets all toasty warm!!

 

Anyway, a laser thermometer and this and some maths might help??

Stefan Boltzmann Law Calculator

WWW.OMNICALCULATOR.COM

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Stefan Boltzmann law calculator uses the temperature and emissivity of a body to find the power radiated from it.

 

[Mike Hill]

Those stoves are ment to be free standing, you have a dampner top right be the looks of it.

 

Putting it inside a mansonry alcove which is a giant heat sink probably means you get about 2kw out the front of that.

 

Plus most every Jøtul has a section of pipe exposed over here, as the pipe does a 90 deg turn before it meets a chimney. You get alot of heat from that pipe section.

[Muddy42]

I agree with the posts above.  Where the flue meets the stove looks really odd.  I'd guess a lot of your heat is going up the chimney. The heat energy cannot simply be destroyed.

 

My parents have an identical stove.  Its great, if anything it can produce too much heat at times.

 

Watch out for some of the modern 'more efficient' stoves.  I have one and its a tricky customer to light without smoking into the room.

[Stubby]

42 minutes ago, Muddy42 said:

I agree with the posts above.  Where the flue meets the stove looks really odd.  I'd guess a lot of your heat is going up the chimney. The heat energy cannot simply be destroyed.

 

My parents have an identical stove.  Its great, if anything it can produce too much heat at times.

 

Watch out for some of the modern 'more efficient' stoves.  I have one and its a tricky customer to light without smoking into the room.

I have one of the modern " more efficient stoves " and its a piece of piss to light and no smoke comes into the room . get one 🙂

[Muddy42]

18 minutes ago, Stubby said:

I have one of the modern " more efficient stoves " and its a piece of piss to light and no smoke comes into the room . get one 🙂

 

Lucky you, my Esse one is aweful!  I have to bring out all the tricks - shut door, open window, pray, small fire first to get the flue hot etc. I've had to modify the stove to widen the airflow holes and widen the size of its vermiculite baffle board.

 

I also have a 10 year old clearview that shares the same chimney stack and its easy to light.  You simply open up all the vents, one log/one kindling/one page of newspaper and its roaring like a train in minutes!

[Stubby]

40 minutes ago, Muddy42 said:

 

Lucky you, my Esse one is aweful!  I have to bring out all the tricks - shut door, open window, pray, small fire first to get the flue hot etc. I've had to modify the stove to widen the airflow holes and widen the size of its vermiculite baffle board.

 

I also have a 10 year old clearview that shares the same chimney stack and its easy to light.  You simply open up all the vents, one log/one kindling/one page of newspaper and its roaring like a train in minutes!

Mine is a Burley . Can get it going with brown paper and medium logs and some strategically placed fire lighters if I have no kindling to hand . Really good draw on the chimney .  

[woodlover2]

Try burning some dry pallet wood as this generates more heat than logs, you will have to load it up every 10 mins or so but it will tell you if the logs are the issue...or split your logs to smaller peices so they burn faster and hotter..I have a 4KW stove and it is great with smaller logs and pallet wood but add usual size logs from sellers and its crap,always have to split 1 or 2 more times.And make sure the stove has that baffle plate thing still as they do burn out and the previous owners (if you did not buy it) may not have replaced it.

[Mr. Squirrel]

We had the exact same stove. It was in a not dissimilar alcove and took ages to really heat the room. Probably 1-2 hours of enthusiastic burning to get some warmth from it. When we had it out for chimney work I found a manifold plate on the back in pieces. I’d check that out If you can. The top isnt screwed down so use fairly easy to get in and out. 
 

We replaced it with a DG ivar 5 and the difference is phenomenal. Though the ivar is noisy. 

Edited March 28, 2023 by Mr. Squirrel

[Logdaft]

18 hours ago, Stubby said:

Mine is a Burley . Can get it going with brown paper and medium logs and some strategically placed fire lighters if I have no kindling to hand . Really good draw on the chimney .  

Ditto 👍

[Jack0]

On 24/03/2023 at 08:34, Peasgood said:

Has it been refurbed and fitted with taller thicker firebricks?

It doesn’t have firebricks inside , just cast iron plates .