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Hotties Heat Logs vs. traditional firewood and alternative fuels

The following page outlines how Hotties Heat Logs offer great value for money when compared to traditional firewood and alternative fuels. Hotties Heat Logs are also better for the environment thanks to a moisture content of less than 5%, so you’re not paying for water which, when burned, has a negative impact on air quality.

Comparing Hotties Heat Logs with other firewood

	Hotties	Kiln dried hardwood	Kiln dried softwood
Price per tonne	£689	£708	£449
Moisture Content	6%	20%	20%
Heat Output (kWh per kg)	4.9	3.98	3.98
Cost (pence per kWh)	14.06	17.81	11.26

Comparing Hotties Heat Logs with other fuels

	Fresh Wood	Seasoned Wood	Hotties	Coal	Heating Oil
Water Content %	50	15-20	5**	6	Negligible
Energy Density by	2.23	3.98	4.90	7.70	11.80
Ash Residue %	1.15 - 2.0	1.0	0.4 - 1.0	6.75	0
Volume of One Tonne (m³)	3.5 - 5.0*	3.0 - 4.0*	1.4	1.13	1.0
Origin/Enviro. impact	Woodlands	Woodlands	Recycled	Mining	Drilling/Refining

* Varies with species

** moisture content is indicative, normally between 4% and 6%

? indicative averages for bituminous coal

Softwood

	Price per m³ (approx)	Moisture Content	Heat Output per kWh/kg	Heat Coat Pence - kWh/kg
Hotties	£499/per m³	5%	4.90	8.06
Woodlogs	at £75 equiv. £300/per m³	20%	3.98	7.54
		30%	3.39	8.85
		40%	2.81	10.68
		50%	2.23	13.45
Woodlogs	at £100 equiv. £400/per m³	20%	3.98	10.05
		30%	3.39	11.80
		40%	2.81	14.23
		50%	2.23	17.94
Woodlogs	at £125 equiv. £500/per m³	20%	3.98	12.56
		30%	3.39	14.75
		40%	2.81	17.79
		50%	2.23	22.42

1. Assumes 1m³ roundwood = 2m³ bulk chopped logs.

2. Assumes 13% moisture content - much drier than most wood log deliveries

3. Assumes softwood density at its average of 500kg/m³

4. To calculate tonnage of woodlogs we have multiplied the cost by 4.0.

5. Heat output varies with species.

Hardwood

	Price per m³ (approx)	Moisture Content	Heat Output per Kw/h	Heat Coat Pence - Kw/h
Hotties	£499/per m³	5%	4.90	8.06
Woodlogs	at £75 equiv. £300/per m³	20%	3.98	6.08
		30%	3.39	7.14
		40%	2.81	8.61
		50%	2.23	10.85
Woodlogs	at £100 equiv. £400/per m³	20%	3.98	8.09
		30%	3.39	9.50
		40%	2.81	11.46
		50%	2.23	14.44
Woodlogs	at £125 equiv. £500/per m³	20%	3.98	10.13
		30%	3.39	11.89
		40%	2.81	14.34
		50%	2.23	18.07

1. Assumes 1m³ roundwood = 2m³ bulk chopped logs.

2. Assumes 13% moisture content - much drier than most wood log deliveries

3. Assumes softwood density at its average of 620kg/m³

4. To calculate tonnage of woodlogs we have multiplied the cost by 3.22.

5. Heat output varies with species.

These tables are a guide only and provided in good faith.

All information is based off research conducted in 2018, the same year as publishing.

Increasingly, traditional wood logs are sold with a great variation in their moisture content. This has a significant impact on heat output

Moisture content

- Fresh cut wood logs >60%
- Seasoned wood logs 25-35%
- Kiln dried logs <20%
- Hotties Heat Logs <5%

Burning hotter and longer than your average fuel source

Average radient output

The chart compares the average radiant heat output of Hotties Heat Logs with a regular bag of coal in a controlled burn test, carried out over a period of 150 minutes.

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