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• FIRST POST
• nxf
• By nxf 13th Feb 18, 9:36 AM
• 13Posts
• 1Thanks
nxf
I am looking for a traditional looking Log stove (with a boiler) that heats a small cottage room and the boiler part to feed into a (not yet purchased) thermal store. I have used the calculation of 1kW for every 14 cubic metres which equals 2.6kW.

The room has two doors that are left permanently open so we guess about 5kW will do? (Also 5kW is the largest before a ventilation hole is required in the external wall).

As an example the Stovax Stockton 8HB nominal outputs 4.9kW to room and 8.2kW to boiler. What I don't understand is why the room is not heated to 8.2kW? as a stove is basically a metal box with an exhaust and also it requires the ventilation hole even though it states 4.9kW is to the room?????

Any help would be most appreciated.

(Please don't ask me to contact Stovax as I have emailed with no response and also phoned twice and not got through after 1/2 hour waiting each time)
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• Ectophile
• 13th Feb 18, 9:08 PM
• 2,962 Posts
• 1,838 Thanks
Ectophile
The back of the stove will be full of water. That will absorb heat from the fire whether you need to to or not. The 4.9kW is what's left over after heating the water.

You need to make sure the hot water can always go somewhere - try to block the flow and the stove is liable to explode.

I don't think you can claim that stove is less than 5kW for ventilation purposes. The total output of it is a claimed 10kW (the maths seems a bit odd there).
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• FreeBear
• By FreeBear 13th Feb 18, 10:25 PM
• 1,459 Posts
• 2,125 Thanks
FreeBear
If you want a small stove with a back boiler, have a look at the Hobbit from Salamander - http://salamanderstoves.com/the-hobbit-stove/

Dinky little thing and rated at 4Kw.
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• matelodave
• 13th Feb 18, 10:35 PM
• 3,377 Posts
• 2,060 Thanks
matelodave
The stove requires ventilation for combustion and it's considered that a 5kw stove can get enough air without additional ventilation.

However a 5kwh stove with a 8kw back boiler becomes a 10-12kw stove and so requires extra air otherwise you are in danger from CO poisoning.

As said above the water flowing through the back boiler will absorb a significant amount of heat and thus reduce the heat available to warm the room. Once the boiler is heated then the extra heat will be radiated into the room so you need to make sure that the boiler can circulate the hot water otherwise it will boil,
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