Plan fuel and power
Choose a position with access to a 230V supply. The 38L tank takes diesel or kerosene. Refuel only when the heater is switched off and cool.
Hyundai 125,000BTU / 37kW Diesel or Kerosene Space Heater, 900m3 Coverage, Thermostat | HY125DKH
Hyundai 125,000BTU / 37kW Diesel or Kerosene Space Heater, 900m3 Coverage, Thermostat | HY125DKH
Regular price
£272.99
Sale price
£272.99
Regular price
inc. VAT
£227.49 ex. VAT
Tax included.
Shipping calculated at checkout.
3 year home warrantySee what's covered
- 3 year home warranty
- 1 year commercial warranty
- 90 day hire warranty
Terms and exclusions apply.
Find out more
3 year home warrantySee what's covered
- 3 year home warranty
- 1 year commercial warranty
- 90 day hire warranty
Terms and exclusions apply.
Find out more
Item available for pre-order — this product will be shipped after 18 November 2026.
Payment methods
At a Glance
- 37kW heat output for suitably ventilated workspaces
- Approx. 900m³ heating volume; varies with ventilation, insulation and application
- Adjustable thermostat to set your preferred temperature
- 38L tank for diesel or kerosene; 230V mains supply also required
- Wheeled frame and handle; switch off, cool and unplug before moving
- Requires fresh-air ventilation; not for domestic living or sleeping areas
HY125DKH · Diesel / kerosene space heater
Bring warmth to the working day
Cold conditions make a demanding job less inviting. Bring 37kW of heat to a suitably ventilated work area, then use the thermostat to choose the temperature setting that suits the job.
Requires fuel, 230V power and fresh-air ventilation in accordance with the model manual.
37kW
Rated heat output
900m³
Approx. heating volume
38L
Fuel tank
230V
Electrical supply required
Coverage is a guide and varies with ventilation, insulation and application. m³ is volume, not floor area.
Put heat to work
From setting up to moving between jobs
Set the temperature
Use the thermostat dial to choose the temperature setting for your work area as you get ready for the job.
Roll it to the next job
Switch off, let the heater cool and unplug it. Use the handle and wheels to move it into position for the next job.
For suitably ventilated workspaces only. Do not use in domestic living or sleeping areas.
Compare the range
Choose the heat output for your workspace
Compare output and approximate heating volume, then check the requirements of your space.
HY70DKH
- Heat output
- 20kW
- Approx. heating volume
- 496m³
- Fuel tank
- 19L
HY125DKH
- Heat output
- 37kW
- Approx. heating volume
- 900m³
- Fuel tank
- 38L
HY215DKH
- Heat output
- 63kW
- Approx. heating volume
- 1,500m³
- Fuel tank
- 50L
Measure the whole space, including its height.
Length × width × height = volume (m³).
For example: 10m × 8m × 3m = 240m³. This calculates room volume; it does not calculate the heat required.
Coverage is a guide and varies with ventilation, insulation and application. m³ is volume, not floor area. All models require fuel, 230V power and fresh-air ventilation in accordance with the model manual.
Before you start
Plan the setup before you switch on
Watch the setup walkthrough
See the assembly and controls before preparing your heater for use.
This is the existing walkthrough. Follow the supplied manual for ventilation, clearances and refuelling. Pressure adjustment is maintenance guidance, not a routine setup step. Coverage figures are approximate volume guides.
Make space for the heater
- 1.25m minimum clearance on all sides.
- 2m recommended at the hot-air outlet.
Maintain fresh-air ventilation
Maintain the fresh-air ventilation required by the model manual.
Do not use in domestic living or sleeping areas.
Move only when safe
Switch off · cool · unplug
Allow the heater to cool and unplug before moving. Use the wheeled frame and handle when relocating the heater.
HY125DKH
Know your machine
| Rated heat output | 37kW |
|---|---|
| Approx. heating volume | 900m³ — guide only |
| Fuel tank | 38L |
| Listed fuel consumption | 3.6L/h — use dependent |
| Fuel | Diesel or kerosene |
| Electrical supply | 230V |
| Temperature control | Adjustable thermostat |
| Handling | Wheeled frame |
Before you choose
Your questions, answered.
Does it need electricity?
Yes. The manual specifies a 230V supply in addition to diesel or kerosene.
Is the coverage guaranteed?
No. The listed approximate 900m³ is a volume guide, subject to insulation, ventilation and operating conditions.
Can I use it in any garage or workshop?
No. The building label alone does not establish suitability. Check the exact model manual, ventilation, clearances and the materials present before use.
What if the heater trips the supply?
Stop using it and contact support if it repeatedly trips or blows a fuse. Do not keep resetting it or fit a larger fuse to bypass the fault.
Support beyond the first job
Know your warranty cover
3-year non-commercial warranty · 1-year commercial warranty · 90-day hire warranty.
Terms, maintenance requirements and exclusions apply. Warranty cover does not change the permitted uses of the machine.Help when you need it
The aftersales team can help with product questions, identifying replacement parts and repair enquiries. Have your model, serial number and proof of purchase ready.
Expert Advice
Our team are experts in our products. Whatever your question, they can help.
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