How Much Wood do you Burn in a Week of cold Weather?

[GarethM]

It'll be cheaper than here as Sweden uses a lot of nuclear and hydro I think.

 

Mine is something mental like 35 or 38p a kwh as I'm out of town.

[sandspider]

8 minutes ago, Big J said:

 

I think you misunderstand.

 

30 kwh is the total electricity usage for everything. That's 98% of our heating too. Our house is about 240 square metres.

I understand. Just seems very high for a well insulated modern house with eco friendly air source heat pump. (Though to be fair, I've not worked out how many kWh of logs and oil we get through per day).

 

Glad we don't heat with electricity, that would cost £450 odd per month here. 

[GarethM]

Wasn't sure they bought it off the Norwegians 🙂

[sandspider]

26 minutes ago, Big J said:

 

I reckon you're seriously underestimating the kwh in your logs and oil....

 

1kg of 20% MC wood contains 4 kwh of energy, of which 3.2 - 3.5 kwh will be emitted to the room/heating system (assuming 80-88% efficiency). 

 

So, I reckon that our two heat pumps are using 20 kwh (the rest is hot water, dishwasher, washing machine, general house stuff) a day at the moment (at an average external temp of 0c, which would be considered a cold snap in the UK) which is roughly equivalent to 6kg of logs. 

 

I regard that as extraordinarily efficient. 

 

Similarly, 20 kwh is 2 litres of heating oil, though our heat pumps have a COP of around 4, so we're actually getting about 80 kwh to the house, which is equivalent to 8 litres. 

 

Ah. You may be right there. In that case I don't want to work out what our total energy consumption is per day, it'll be terrifying. And our house isn't even that warm!

[neiln]

With 2 stoves both only 5kw nominal I can still keep the house warm in weather that is overcast and let's say daily maximums of 3-4C, and overnight lows of -3 to -5C. Doing so does mean both stoves running 12-15 hours a day which can burn through about a cube of wood.  Maybe slightly less if Oak but more of its softwood. 

[neiln]

That btw is about 40 kg of logs daily (2 year dried Oak), or a lot more than big J's equivalent!

[Woodworks]

In last week which hasn't been especially cold but very wet we use a garden trugs worth every two days. estimate thats about 10kg a night. Keeps the whole house comfy and the sitting room toasty. Thats a 7kWh wood burner and not doing the hot water 

[pie eater pete]

Roughly an IBC full a week, feeding a 20kw Woodwarm stove with back boiler on it.

[MattyF]

Maybe a cube a week on this for two houses water and heating. 

about one tub a day on the esse for cooking. 
and maybe two barrows a day for the other three fires if they are lit… to be honest that’s rare and only on holidays in winter if there’s people in the house. 

[neiln]

I'm getting the feeling my 1930s semi is poorly insulated.  I knew that anyway