Wood Waste Technology designs and manufactures wood-burning heaters built to run on the offcuts, shavings, and waste timber that joinery and timber businesses generate as a matter of course. Their WT series heaters scale from compact workshop units through to larger models capable of heating substantial factory spaces, turning a waste disposal problem into a genuine heating asset. IWM works with Wood Waste Technology because their equipment makes obvious practical and financial sense for any timber business looking to reduce both heating costs and waste disposal overhead.
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Joinery and timber workshops with a consistent weekly output of wood waste looking to eliminate or reduce heating bills
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Operations producing MDF, chipboard, hardwood, or softwood offcuts who want a compliant way to dispose of waste and heat the building at the same time
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Businesses in smoke control areas, or those needing to demonstrate Clean Air Act compliance, who cannot run a simple open-burn solution
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Your workshop is between roughly 5,000 and 7,500 ft² and you need a heater sized to match
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You are generating 800–1,250 kg of wood waste offcuts per week and want to use that as your primary fuel source
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You need to demonstrate Clean Air Act compliance and cannot or do not want to install an oil or gas afterburner
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You want a mid-range output without stepping up to the larger capital cost and fuel demand of the WT15
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Your workshop is smaller — under roughly 3,000–4,000 ft² or your weekly waste volume is below 800 kg, in which case the WT5 or WT2 is likely a better fit and will cost less to run
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Your workshop exceeds 7,500 ft² or you have an unusually high heat demand, in which case the WT15 is worth discussing
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Your waste output is inconsistent week to week — a heater sized around peak waste volumes may be underutilised for much of the year, and a smaller model may suit your baseline better
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You are unsure whether your waste stream contains prohibited materials — we would want to confirm fuel suitability before specifying any model in this range
- Key Specifications:
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Heat Output, Specification Value:
300,000 BTU/hr (89 kW), Specification Notes:
Rated sufficient to heat workshops of up to 7,500 ft², though actual coverage will depend on insulation, ceiling height, and draughts — worth discussing your building with us before specifying.
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Weekly Waste Throughput, Specification Value:
800–1,250 kg per week, Specification Notes:
This is the fuel demand as well as the disposal rate — your workshop needs to be generating roughly this volume of burnable waste each week to run the heater efficiently.
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Accepted Waste Types, Specification Value:
MDF, chipboard, hardwood, softwood offcuts
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Clean Air Act Compliant, Specification Value:
Yes — no oil or gas afterburner required, Specification Notes:
Compliance means this unit is approved for use in smoke control areas and does not require a supplementary fossil-fuel burner to meet emissions requirements, reducing both installation cost and ongoing running cost.
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Model, Specification Value:
WT10
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Manufacturer, Specification Value:
Wood Waste Technology
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Heat Output, Specification Value:
300,000 BTU/hr (89 kW), Specification Notes:
Rated sufficient to heat workshops of up to 7,500 ft², though actual coverage will depend on insulation, ceiling height, and draughts — worth discussing your building with us before specifying.
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Maximum Workshop Coverage, Specification Value:
Up to 7,500 ft²
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Weekly Waste Throughput, Specification Value:
800–1,250 kg, Specification Notes:
This is the fuel demand as well as the disposal rate — your workshop needs to be generating roughly this volume of burnable waste each week to run the heater efficiently.
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Air Volume, Specification Value:
5,050 m³/hr
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Accepted Waste Types, Specification Value:
MDF, chipboard, hardwood, softwood offcuts
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Heat Exchange Type, Specification Value:
Double-pass
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Clean Air Act Compliant, Specification Value:
Yes, Specification Notes:
Approved for use in smoke control areas without a supplementary oil or gas afterburner.
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Oil/Gas Afterburner Required, Specification Value:
No
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Dimensions, Specification Value:
Contact IWM to confirm, Specification Notes:
Allow additional clearance around the unit for safe fuel loading, ash removal, and flue routing — speak to us before finalising your floor plan.
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Weight, Specification Value:
Contact IWM to confirm, Specification Notes:
Floor loading should be verified before installation; contact us and we will confirm the figure with the manufacturer.
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Electrical Supply Required, Specification Value:
Contact IWM to confirm, Specification Notes:
Electrical requirements vary by configuration; we will confirm phase and amperage when specifying.
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Flue Specification, Specification Value:
Contact IWM to confirm, Specification Notes:
The flue can exit through either the wall or roof and must discharge to open air outside the building; diameter and minimum height are confirmed at the specification stage.
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Hopper/Feed Capacity, Specification Value:
Contact IWM to confirm, Specification Notes:
Feed capacity affects how frequently the unit needs to be loaded; we will confirm this detail when discussing the installation with you.
Turn your weekly wood waste into free workshop heating. The WT10 suits medium to large joinery and timber operations generating enough offcuts each week to keep a 300,000 BTU/hr heater running without supplementary fuel.
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Joinery and timber workshops generating significant volumes of MDF, chipboard, hardwood, or softwood offcuts each week
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Businesses heating large or hard-to-warm workshop spaces who want to reduce or eliminate gas and oil heating costs
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Workshops looking for a Clean Air Act-compliant burning solution that doesn't require an afterburner to operate legally
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Your workshop generates 1,000 kg or more of wood waste per week and you want to consume it on-site rather than pay for disposal
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You need to heat a large workshop space and want the highest output available in the hand-fired range
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You want Clean Air Act compliance without the cost and complexity of an afterburner
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Payback period matters — at higher waste volumes the WT15 typically returns its cost within around 12 months
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Your weekly waste output is consistently below 1,000 kg — the WT10 or WT5 may be better matched to your actual volume and avoid over-specifying
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You have a smaller workshop or lower heat demand — the <a href="index.php?option=com_content&view=article&id=128&catid=41">WT10 Wood Burning Heater</a> is worth discussing with us before committing to the WT15
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Your workshop is very small or waste volumes are modest — the WT5 or <a href="index.php?option=com_content&view=article&id=126&catid=41">WT2 Wood Burning Heater</a> may heat your space adequately at lower capital cost
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You are unsure of your weekly waste tonnage — speak to IWM before specifying, as sizing this correctly affects both performance and payback
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Heat Output, Specification Value:
500,000 BTU/hr (145 kW/hr), Specification Notes:
IWM can advise whether this output is sufficient for your specific building volume and insulation level.
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Waste Throughput, Specification Value:
1,000–2,000 kg/week, Specification Notes:
This range reflects variation in waste type and moisture content — denser or wetter material will sit toward the lower end.
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Accepted Waste, Specification Value:
MDF, chipboard, hardwood, softwood
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Clean Air Act Compliant, Specification Value:
Yes, Specification Notes:
Compliant without the need for an oil or gas afterburner, which simplifies installation and reduces ongoing fuel costs.
- Full Specifications:
- Specification Name:
Heat Output, Specification Value:
500,000 BTU/hr (145 kW/hr), Specification Notes:
IWM can advise whether this output is sufficient for your specific building volume and insulation level.
- Specification Name:
Waste Throughput, Specification Value:
1,000–2,000 kg/week, Specification Notes:
This range reflects variation in waste type and moisture content — denser or wetter material will sit toward the lower end.
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Accepted Waste Types, Specification Value:
MDF, chipboard, hardwood, softwood
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Firing Method, Specification Value:
Hand-fired
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Clean Air Act Compliant, Specification Value:
Yes, Specification Notes:
Approved for use in smoke control areas without requiring an additional afterburner — check your local authority designation before installing.
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Afterburner Required, Specification Value:
No, Specification Notes:
Removes the ongoing oil or gas cost that afterburner-dependent units carry.
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Typical Payback Period, Specification Value:
Approx. 12 months, Specification Notes:
Based on replacing existing heating fuel costs with waste that would otherwise be disposed of — actual payback will depend on your current fuel costs and waste volumes.
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Dimensions (L × W × H), Specification Value:
2,420 × 1,180 × 2,095 mm, Specification Notes:
Allow additional clearance around the unit for safe loading access and flue routing — IWM can advise on installation requirements.
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Weight, Specification Value:
1,700 kg, Specification Notes:
At 1,700 kg, floor loading should be checked with a structural engineer before installation, particularly in older or mezzanine-level buildings.
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Electrical Supply Required, Specification Value:
Three phase + neutral, 20 A, Specification Notes:
Three-phase supply is required — confirm your workshop has this available before specifying, as retrofitting a three-phase supply adds cost and lead time.
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Flue Specification, Specification Value:
255 mm (10") diameter, Specification Notes:
Flue can exit through wall or roof and must terminate in open air — IWM can advise on routing as part of the installation specification.
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Emissions Compliance, Specification Value:
DEFRA-listed Clean Air Act exempt appliance, Specification Notes:
DEFRA listing confirms the unit is legally exempt from smoke control area restrictions without an afterburner — request the exemption reference for your planning or environmental health records.
The WT15 is the largest hand-fired wood waste heater in the WT range, capable of heating workshops over 10,000 sq ft while consuming 1,000–2,000 kg of MDF, chipboard, hardwood, or softwood offcuts per week. For workshops with significant waste volumes and high heat demand, it removes the cost of both waste disposal and conventional heating in a single installation.
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Small joinery or craft workshops looking to offset heating costs by burning their own wood waste
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Businesses with limited floor space who need a heater with a modest footprint
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Workshops heating a single unit or bay up to around 2,500 ft² where a larger WT model would be over-specified
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Your workshop is a single unit or bay up to around 2,500 ft² and does not require zoned or multi-area heating
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Your wood waste output sits broadly in the 200–350 kg per week range — enough to fuel consistent heating without surplus
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Floor space is limited and you need the most compact option in the WT range, with single-phase electrical installation and no specialist wiring
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Your workshop exceeds 2,500 ft² — the WT5 (up to ~4,000 ft²) or WT10 (up to ~7,500 ft²) will be more appropriately sized and avoid the unit running beyond its design capacity
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You produce significantly more than 350 kg of wood waste per week — the WT10 (800–1,250 kg/week) or WT15 (1,000–2,000 kg/week) may be better matched to your waste volume
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Your waste stream includes chipboard or MDF offcuts — the WT5 and above hold full exempt appliance status for composite board materials, which the WT2 does not
- Key Specifications:
- Specification Name:
Heating Coverage, Specification Value:
Up to ~2,500 ft², Specification Notes:
This is an approximate guide — actual coverage will depend on insulation quality, ceiling height, and building fabric. IWM can help you assess whether the WT2 is correctly sized for your space.
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Heat Output, Specification Value:
25 kW / 85,300 BTU/hr, Specification Notes:
At 25 kW this is a direct warm-air unit — heat is delivered into the workshop space rather than via wet radiator circuits, so placement and any ductwork runs need to be planned at installation stage.
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Fuel Consumption, Specification Value:
200–350 kg of wood waste per week, Specification Notes:
Whether your waste output matches this range is worth checking before specifying — if your workshop produces significantly more or less, a different model in the WT range may be a better fit.
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Thermostatic Control, Specification Value:
Yes — fully thermostatically controlled, Specification Notes:
The thermostat regulates burn rate automatically, so the heater maintains a consistent temperature without manual adjustment throughout the working day.
- Full Specifications:
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Model, Specification Value:
WT2
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Manufacturer, Specification Value:
Wood Waste Technology
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Heating Coverage, Specification Value:
Up to ~2,500 ft², Specification Notes:
Approximate figure — dependent on insulation, ceiling height, and building construction.
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Heat Output, Specification Value:
25 kW / 85,300 BTU/hr
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Air Volume, Specification Value:
2,730 m³/hr
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Fuel Consumption, Specification Value:
200–350 kg of wood waste per week, Specification Notes:
Consumption range reflects variation in waste type, moisture content, and heating demand.
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Fuel Types Accepted, Specification Value:
Uncontaminated softwood and hardwood timber offcuts, Specification Notes:
The WT2 is designed for clean, dry wood waste only — it does not carry the exempt appliance status required to burn chipboard or MDF; if your waste stream includes composite board, the WT5 or above should be considered.
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Thermostatic Control, Specification Value:
Yes
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Unit Dimensions (L × W × H), Specification Value:
1,695 mm × 950 mm × 1,000 mm, Specification Notes:
Allow additional clearance around the unit for safe loading access and flue connection; confirm exact clearances with your installer.
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Weight, Specification Value:
310 kg
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Electrical Supply Required, Specification Value:
Single phase, 13 A, Specification Notes:
Standard single-phase supply — no dedicated 3-phase circuit required, which simplifies installation in most workshop settings.
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Flue, Specification Value:
Stainless steel flue sold per metre; maximum recommended ductwork height 6 m, Specification Notes:
Flue runs above 6 m require prior discussion with your installer due to health and safety requirements.
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DEFRA Approval, Specification Value:
Yes — DEFRA approved, Specification Notes:
DEFRA approval confirms the unit meets clean air standards; however, the WT2 does not hold full exempt appliance status for composite board materials, so check your local smoke control area status and waste type before specifying.
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Warranty, Specification Value:
Contact IWM to confirm, Specification Notes:
Warranty terms were not published by the manufacturer at time of writing — speak to IWM for current details.
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Maintenance, Specification Value:
Virtually maintenance-free
A straightforward way to turn your workshop's wood offcuts into free heat. The WT2 is sized for smaller joinery and craft workshops up to around 2,500 ft², with a compact footprint and minimal installation complexity.
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Small joinery or timber workshops looking to cut heating bills by burning their own wood waste
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Workshops in city centres or residential locations that need a fully exempt appliance to comply with clean air regulations
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Businesses heating a single production space up to around 4,000 ft² who want a reliable, low-maintenance solution
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Your workshop is up to approximately 4,000 ft² and a single heater can cover the space
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You are based in a smoke control area — city centre, residential zone, or similar — and need a fully exempt appliance
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Your weekly wood waste output broadly matches the 400–650 kg consumption range, so you are not stockpiling or running short
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You want the lowest capital outlay in the double-pass WT range while still getting refractory-lined construction and high-efficiency heat recovery
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Your workshop exceeds 4,000 ft² or you have multiple zones to heat — the WT10 or WT15 will provide the additional output needed
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You generate significantly more than 650 kg of wood waste per week and want to burn it all — a larger model such as the WT10 or WT15 will match your waste volume more closely
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Your space is smaller and a lower output unit would be more appropriate — the WT2 may be worth discussing with us first
- Key Specifications:
- Specification Name:
Heat Output, Specification Value:
150,000+ BTU/hr (47 kW), Specification Notes:
Sufficient to heat a workshop of approximately 4,000 ft², though actual coverage will depend on insulation, ceiling height, and draughts.
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Fuel Consumption, Specification Value:
400–650 kg per week, Specification Notes:
The range reflects fuel type — denser hardwood offcuts will sit toward the lower end; lighter softwood or MDF toward the higher end.
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Approved Fuels, Specification Value:
Chipboard, MDF, hardwood, softwood offcuts
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Exempt Appliance, Specification Value:
Yes — no afterburner required, Specification Notes:
Fully exempt status means this heater can legally be operated in smoke control areas, including city centres and residential zones, without additional equipment.
- Full Specifications:
- Specification Name:
Heat Output, Specification Value:
150,000+ BTU/hr (47 kW), Specification Notes:
Sufficient to heat a workshop of approximately 4,000 ft², though actual coverage will depend on insulation, ceiling height, and draughts.
- Specification Name:
Fuel Consumption, Specification Value:
400–650 kg per week, Specification Notes:
The range reflects fuel type — denser hardwood offcuts will sit toward the lower end; lighter softwood or MDF toward the higher end.
- Specification Name:
Approved Fuels, Specification Value:
Chipboard, MDF, hardwood and softwood offcuts
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Exempt Appliance Status, Specification Value:
Yes, Specification Notes:
Fully exempt status means this heater can legally be operated in smoke control areas, including city centres and residential zones, without an afterburner.
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Firebox Construction, Specification Value:
Full refractory-lined firebox, Specification Notes:
Refractory lining protects the firebox structure from sustained high temperatures, contributing to long-term reliability.
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Heat Exchanger, Specification Value:
Double-pass with fully welded heat recovery fins, Specification Notes:
The double-pass design extracts more heat from combustion gases before they exit the flue, improving efficiency compared to single-pass units.
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Afterburner Required, Specification Value:
No
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Recommended Workshop Size, Specification Value:
Up to approx. 4,000 ft²
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Dimensions (L × W × H), Specification Value:
1,495 mm × 915 mm × 1,715 mm, Specification Notes:
Allow additional clearance around the unit for safe fuel loading, ash removal, and maintenance access.
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Weight, Specification Value:
Approx. 310 kg, Specification Notes:
Floor loading should be verified before installation — talk to us if you have any doubt about slab suitability.
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Flue Specification, Specification Value:
Stainless steel flue supplied per metre — diameter to be confirmed at point of order, Specification Notes:
Flue routing (wall or roof), run length, and any required summer heat-dump hood will be scoped as part of the installation quote.
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Electrical Supply Required, Specification Value:
Single phase, 15 A, Specification Notes:
A standard single-phase supply is sufficient — no three-phase installation required.
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Certifications, Specification Value:
DEFRA and SEPA approved, Specification Notes:
DEFRA and SEPA approval confirms the unit meets UK and Scottish clean air requirements, giving you the regulatory basis to operate in smoke control areas.
Turn your timber offcuts into free workshop heat — without an afterburner, and without falling foul of clean air regulations. The WT5 suits single-space workshops up to around 4,000 ft² that produce a moderate volume of mixed wood waste each week.
