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.
Typically chosen by
Joinery and timber workshops generating significant volumes of MDF, chipboard, hardwood, or softwood offcuts each week
Businesses heating large or hard-to-warm workshop spaces who want to reduce or eliminate gas and oil heating costs
Workshops looking for a Clean Air Act-compliant burning solution that doesn't require an afterburner to operate legally
IWM can advise whether this output is sufficient for your specific building volume and insulation level.
Waste Throughput
1,000–2,000 kg/week
This range reflects variation in waste type and moisture content — denser or wetter material will sit toward the lower end.
Accepted Waste Types
MDF, chipboard, hardwood, softwood
Firing Method
Hand-fired
Clean Air Act Compliant
Yes
Approved for use in smoke control areas without requiring an additional afterburner — check your local authority designation before installing.
Afterburner Required
No
Removes the ongoing oil or gas cost that afterburner-dependent units carry.
Typical Payback Period
Approx. 12 months
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.
Dimensions (L × W × H)
2,420 × 1,180 × 2,095 mm
Allow additional clearance around the unit for safe loading access and flue routing — IWM can advise on installation requirements.
Weight
1,700 kg
At 1,700 kg, floor loading should be checked with a structural engineer before installation, particularly in older or mezzanine-level buildings.
Electrical Supply Required
Three phase + neutral, 20 A
Three-phase supply is required — confirm your workshop has this available before specifying, as retrofitting a three-phase supply adds cost and lead time.
Flue Specification
255 mm (10") diameter
Flue can exit through wall or roof and must terminate in open air — IWM can advise on routing as part of the installation specification.
Emissions Compliance
DEFRA-listed Clean Air Act exempt appliance
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.
