On 24 Dec, 20:43, Pete C wrote:
On Dec 24, 3:29 pm, wrote:

According to Wikipedia, coal is about 6.67 kWh/kg.

A lot depends on what sort of coal it is.

Also according to Wikipedia anthracite has an LHV of 33MJ/kg which
gives 9.17kWh/kg.

I doubt Aga owners will be feeding their beast on 'value' brown coal,
more like /Finest/ smokeless or anthracite ))

cheers,
Pete.

I suppose inferior fuels are unlikely to be used by aga owners. In
which case the solid fuel efficiency is on a par with gas and oil -
ie. really bad considering we are in the 21st century.

Some people care about environmental impact, and are prone to
measuring this in terms of CO2 produced. I reckon that an Aga, left on
all the time, will produce the following emissions:

solid fuel: 6.8 tonnes CO2
oil: 5.2 tonnes CO2
gas: 4.2 tonnes CO2

Isn't the average CO2 per person in the UK about 10 tonnes!

T