Old Nashua Stoves...

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jeremiah77

Member
Sep 20, 2010
10
Central MD
I posted a couple weeks ago about making a decision about chimney construction for our stove installation. We have decided to go with an interior block chimney because we are ripping our house apart and it seems like the best time to do it. We do not have the money for HT chimney pipe, and a block chimney suits us at this point. The chimney is 20' from thimble to cap, and 28' from foundation to cap. We will be using chimney block with round terra cotta flue tile. We have an option of two stoves to install, a Timberline monster with an 8" flue and around 2.8 cubic feet or an old Nashua that needs some love with about 2 cubic feet and a 6" flue. We think the Timberline will be too big for our small 1200 sq ft house, and are contemplating going with the Nashua.

Four questions:

1. Any thoughts on how decent an old nashua like this one will be? (see picture)
2. If we install the Nashua and do a 6" flue, will we have flexibility going forward for changing out stoves? It seems that most modern stoves have 6" flues. Is this correct? Options we are considering are 6" round or 8" square. It seems that we can use the Timberline with a 6" round flue, obviously with a reduction in performance - the chimney is completely straight and the only bend is at the thimble.
3. Just how much of a performance difference (heat generated, wood consumed etc) would we experience between the Timberline or Nashua and a new stove? We have limited cash.... :( We haven't been able to get a clear idea of just how impressive performance improvements are.
4. We have looked over the chimney information on hearth.com and it was helpful - does anyone have any additional guidance or resources for chimney construction of this sort? We have experience with all sorts of masonry and it seems fairly straightforward, but there might be tips or tricks that we haven't come across.

Thanks.
 

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jeremiah77 said:
Options we are considering are 6" round or 8" square.

Are those the inside diameters or the outside? My 8" nominal size tile flue only measures 7" on the inside, so it has the same cross-sectional area as 8" round pipe. If the 6" round tiles are nominal size, they will only be 5" on the inside. IMO that is too small for either stove.
 
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