Need Internal Length and Width Dimensions for Your Firebox

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lsayre
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Posts: 12540
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post Thu. Jul. 03, 2014 5:43 pm

Hitzer 50-93: 24.25 x 14.5 x 375 = 131,860 BTU's

Hitzer 30-95: 20 x 12 x 375 = 90,000 BTU's

Thanks much for the measurements!

ddahlgren
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Posts: 1675
Joined: Tue. Feb. 19, 2013 3:30 pm
Hand Fed Coal Stove: Crane 404
Location: Mystic CT
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Post Sun. Jul. 13, 2014 3:54 pm

This seems like conjecture as heat transfer surface area and fan or none are very large factors. The amount of unheated air that can be passed over the stove and keeps it temperature at a realistic level is the governing factor along with how much raw input is possible. Saying that if you have available raw input of 90k btu/hr. and surface area that allows 40k btu/hr. without damaging the stove it is 40k not 90k. Wood stoves are rated with wood you will never burn long term and tops glowing red hot something else you would never do. Cutting them in half is generally a good start as well. Some of the ratings are pretty hard to believe for an un-baffled steel box of small size.

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User avatar
lsayre
Member
Posts: 12540
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW), ComfortMax 75
Location: N/E Ohio, between Medina and Wadsworth

Post Mon. Jul. 14, 2014 5:40 pm

ddahlgren wrote:.... Cutting them in half is generally a good start as well. Some of the ratings are pretty hard to believe for an un-baffled steel box of small size.
I agree. Ever since Franco B pointed me in that direction, I have been a big proponent of cutting the mfgr's BTU ratings in half to bring them into the realm of reality. This being for hand fired stoves. For stokers the feed rate determines the BTUH input and thereby the potential BTUH output.

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