White Heat

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Wight Heat Briquettes are made from 100% clean wood waste, nothing added.

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Typical calorific values of fuels

Fuel

Net Calorific Value (CV) by mass
GJ/tonne

Net Calorific Value (CV) by mass
kWh/kg

Bulk density
kg/m3

Energy density by volume
MJ/m3

Energy density by volume
kWh/m3

Wood chips (30% MC)

12.5

3.5

250

3,100

870

Log wood (stacked - air dry: 20% MC)

14.7

4.1

350-500

5,200-7,400

1,400-2,000

Wood (solid - oven dry)

19

5.3

400-600

7,600-11,400

2,100-3,200

Wood pellets

17

4.8

650

11,000

3,100

Miscanthus (bale - 25% MC)

13

3.6

140-180

1,800-2,300

500-650

House coal

27-31

7.5-8.6

850

23,000-26,000

6,400-7,300

Anthracite

33

9.2

1,100

36,300

10,100

Heating oil

42.5

11.8

845

36,000

10,000

Natural gas (NTP)

38.1

10.6

0.9

35.2

9.8

LPG

46.3

12.9

510

23,600

6,600

 

 

 

Fuel

Price per unit

kWh per unit

pence per kWh

Wood chips (30% MC)

£90 per tonne

3,500 kWh/t

2.6p/kWh

Wood pellets

£185 per tonne

4,800 kWh/t

3.9p/kWh

Natural gas

4.1p/kWh

1

4.1p/kWh

Heating oil

56p per litre

10 kWh/ltr

5.6p/kWh

LPG (bulk)

54p per litre

6.6 kWh/ltr

8.2p/kWh

Electricity

13.0p/kWh

1

13.0p/kWh

 

 Typical prices for bulk purchase of fuels at domestic or small commercial scale, May 2011

N.B. These prices are intended for guidance only and represent the typical cost per unit of fuel energy for comparison. This is not the same as cost per unit of delivered heat which will depend on the efficiency of the boiler or stove, and may also include other charges such as service and maintenance for heat supply contracts.

All prices are prone to significant variation with geographical region, order quantities, overall contract size and duration, time of year, delivery distance and time, etc. Woodfuels in particular are available at prices both significantly above and below those quoted, and bulk prices will be subject to a minimum delivery size of perhaps 3-5 tonnes. Wood pellets bought in bags may be significantly more expensive than those bought in bulk.

Delivery method (speed of delivery) also has a pronounced impact on cost per tonne. It will be far easier, quicker and cheaper to tip a trailer into a chip store than to have to use a chip blower (for example). Additional expenditure on a chip store can have profound financial benefits over the lifetime of the installation.

The market for woodfuels is currently relatively immature which, combined with its unsuitability for long distance transport, supports considerable variation in prices from place to place. Figures have been chosen to represent the mean price achievable across the UK for a single bulk order of 5 tonnes of wood pellets or 10 tonnes of woodfuel quality chips. In the case of the latter however, the prices we see around the country and from different suppliers can vary by a factor of two or more, with £70 - £100 a typical range, but figures both above and below this are not uncommon. For some producers, prices may be subsidized by other activities.

 

Description: Fuel prices per kWh (excluding VAT)

Fuel prices per kWh (excluding VAT)

 

  1. Reference: Biomassenergycentre.org.uk (May 2011)