[Stoves] [MHAtech] Re: Top lit updraft combustors

[Norbert Senf]

On Mon, Dec 18, 2017 at 6:22 PM, Ronal W. Larson <rongretlarson at comcast.net>
wrote:

> *[RWL:  I sometimes hear of reverse flow in chimneys.  Not  to worry in
> your systems?*
>

It can be an issue with cold starts, but is not a safety concern because
there will be noxious smoke, which is obvious. There are various
workarounds/fixes for this
In normal operation, the heater is warm, and will keep powering the chimney
draft long after the fire is out until all the heat is sucked out of the
mass.
During the charcoal phase, when the thermal mass has been heated, chimney
draft is never an issue.

This is quite the opposite of "airtight" stoves that you fill with wood and
then turn down for an overnight burn. During the middle-of-the-night
charcoal phase, draft can get low and house depressurization can cause a
reversal and CO spillage.

>
> *[RWL:  No - medium .  I almost never varied a percentage point from 25%
> by weight (multiply by about 30/18 to get energy).  But we hear 30% by
> weight sometimes (low temperature char).*
>

Thanks, interesting to know what a good number for yield would be
...............N

-- 
Norbert Senf
Masonry Stove Builders
25 Brouse Road, RR 5
Shawville Québec J0X 2Y0
819.647.5092
www.heatkit.com
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