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

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.

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.

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.

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

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

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

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

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

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 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 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 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

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

High

Low

18 kW

11 kW

76 L

695H × 715W × 550D

600 mm

ULEB

NES

3 kW

Take a closer look

The Coaster

High

Low

15 kW

9 kW

56 L

726H × 615W × 554D

ULEB

NES

3 kW

Take a closer look

The Stag

High

Low

15 kW

9 kW

56 L

726H × 615W × 554D

ULEB

NES

3 kW

Take a closer look

RMF

High

Low

11 kW

8 kW

32 L

620H × 580W × 407D

ULEB

NES

3.9 g/kg

82.6%

2 kW

Take a closer look

View the full range

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.

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.