Heating Space Calculator

Calculate with real precision which Woodsman feels right for your home.

This simple four step process will help you identify the Woodsman fires that are ideal for your home using Harris Home Fires proven calculation system.
Learn how it works
Serene woodbox insitu wide
1
Select your zone
In which zone do you live? The country is divided into three areas according to the average daily minimum outdoor air temperature.
2
Select the age
of your home
This will determine insulation levels. If your home insulation has been upgraded or double glazing has been retrofitted, choose the next category up.
3
Select the size of
your heating space
Be realistic when choosing this size. Match the area to the space you are trying to heat, and bear in mind these calculations are based on a ceiling height of 2.4m.
4
Find your Woodsman
The calculator will identify the wood burners that best match your needs. Compare the specifications on your ideal models below and click on each fire to learn more.

Your ideal Woodsman.

The heat loss value of your space is kW and these are the fires that will work best for you.
Average Heat Output
Fuel Consumption Rate
Room Heating Efficiency
Firebox Volume
Fire Dimensions
Max. Log Length
Approx No. Logs
Clean Air Approval
Average Emissions
Average Efficiency
Wetback Approved
Warranty
Serene Petite
Serene Petite
High
Low
6.2 kW
4.5 kW
1.85 kg/h
1.17 kg/h
60.7%
70.6%
25.7 L
834H × 411W × 555D
350 mm
Up to 4
ULEB
NES
0.35 g/kg
66.2%
2Y Parts
15Y Firebox
Take a closer look
Kanaku
Kanaku
High
Low
7.7 kW
8.1 kW
2 kg/h
1.8 kg/h
69%
79%
26.2 L
699H × 502W × 473D
350 mm
Up to 3
ULEB
NES
0.3 g/kg
74%
2Y Parts
15Y Firebox
Take a closer look
Serene
Serene
High
Low
8.5 kW
6.2 kW
2.38 kg/h
1.65 kg/h
63.8%
67.9%
46.7 L
928H × 501W × 613D
400 mm
Up to 6
ULEB
NES
0.36 g/kg
66.2%
2 kW
2Y Parts
15Y Firebox
Take a closer look
Coleridge
Coleridge
High
Low
8.9 kW
7.5 kW
2.55 kg/h
1.94 kg/h
62.3%
69.6%
60.5 L
823H × 615W × 638D
450 mm
Up to 7
ULEB
NES
0.49 g/kg
66.3%
2Y Parts
15Y Firebox
Take a closer look
Flare
Flare
High
Low
12 kW
9.1 kW
3.38 kg/h
2.27 kg/h
64.1%
72.4%
55.5 L
780H × 630W × 602D
450 mm
Up to 6
ULEB
NES
0.97 g/kg
68%
2 kW
1Y Parts
15Y Firebox
Take a closer look
Tasman Mk II
Tasman MkII
High
Low
14.3 kW
8.4 kW
4.04 kg/h
2.05 kg/h
64.4%
78.1%
55.6 L
808H × 615W × 630D
450 mm
Up to 6
ULEB
NES
0.5 g/kg
71%
2 kW
1Y Parts
15Y Firebox
Take a closer look
Tarras Mk III
Tarras MkIII
High
Low
16.9 kW
10.6 kW
4.86 kg/h
2.56 kg/h
63.1%
74.1%
75.3 L
824H × 765W × 640D
600 mm
Up to 10
ULEB
NES
0.37 g/kg
69%
3 kW
1Y Parts
15Y Firebox
Take a closer look
Brunner
Brunner MkII
High
Low
14.3 kW
8.4 kW
4.04 kg/h
2.05 kg/h
64.4%
78.1%
55.6 L
808H × 615W × 630D
450 mm
Up to 7
ULEB
NES
0.5 g/kg
71%
2 kW
1Y Parts
15Y Firebox
Take a closer look
Totara
Totara
High
Low
7.3 kW
4.7 kW
2.26 kg/h
1.13 kg/h
57.5%
75.2%
32.5 L
650H × 840W × 62D
450 mm
Up to 2
ULEB
NES
0.9 g/kg
67%
1Y Parts
15Y Firebox
Take a closer look
Strongman
Strongman
High
Low
18 kW
11 kW
-
-
-
-
76 L
695H × 715W × 550D
600 mm
8
ULEB
NES
-
-
3 kW
-
-
Take a closer look
The Coaster
The Coaster
High
Low
15 kW
9 kW
-
-
-
-
56 L
726H × 615W × 554D
-
6
ULEB
NES
-
-
3 kW
-
-
Take a closer look
The Stag
The Stag
High
Low
15 kW
9 kW
-
-
-
-
56 L
726H × 615W × 554D
-
6
ULEB
NES
-
-
3 kW
-
-
Take a closer look
RMF
RMF
High
Low
11 kW
8 kW
-
-
-
-
32 L
620H × 580W × 407D
-
3
ULEB
NES
3.9 g/kg
82.6%
2 kW
-
-
Take a closer look
Obelisk1
The Obelisk
High
Low
-
-
-
-
-
-
-
-
-
-
ULEB
NES
-
-
-
-
Take a closer look

How does this calculator work?

The Heating Space Calculator is based on maintaining a comfortable room temperature of 23°C with a 2.4m ceiling height. It does this by estimating the Heat Loss Value (kW)taking into account your region, age of home and room dimensionswhat we like to call the sweet spot.

Graph

Why is this calculation system preferred? Real data vs peak moment.

Wood fires do not produce a constant heat output. After loading wood, the output will increase dramatically and then cool down significantly before you reload again.

This calculation system shows an average output taking into consideration the peaks and troughs and gives a genuine figure as to how much heat you will get out of the fire over a typical burn cycle.

While some brands represent their outputs at Peak, which is the very top of the heating curve, we prefer to show an accurate representation of a fires true performance over time.

A calculator based on average output gives you a real performance value and lets you feel confident about correctly heating your chosen space.