Waste oil workshop heaters – Manual Ignition – Drip Waste Oil Heater

 Output range 17kW/ 58,004 BTU’s to 52kW / 177,424 BTU’s

Kroll W401 Waste Oil drip heater – manual ignition – Flexiheat UK

Small waste oil heater – Experience gained over many decades makes the Kroll multi/waste oil heater a reliable, cost effective and an environmentally friendly heating product. Our W401 heater is a manual ignition, or vaporising waste oil heater- which are lower cost, simple to use and maintain and very robust. It is a vaporising heater which means it is drip fed so it does not require a compressed air supply to work unlike our larger waste oil heater, which are detailed on this automatic waste oil heater or multi oil heaters

Unfortunately the Kroll W401 manually fired waste oil workshop heater is no longer manufactured, spare parts are still available for the unit for the foreseeable future, this unit is now superseded by either the Flexiheat “FH” range of multi or universal oil heaters , a waste oil workshop and garage heater that in reality in a multi fuel warm air heater. All the details of the Kroll W401 heater have been moved to the bottom of this web page, where we still have all the technical data, and also the manuals, spare parts drawings/ list and the wiring diagram available as a downloads.

The FH Range of Universal Oil / Waste Oil Drip Heaters

The Flexiheat “FH” range of waste oil heaters produce clean heat with the use of cheap or even free fuel that simultaneously provides high efficiency. Flexiheat waste oil heaters are durable and reliable products based on testing and feedback from many satisfied customers from the UK and Irish markets. These heaters are equipped with safety devices that prevent overheating and oil spillage of these universal oil heaters. They are are manually fired, and all heater models within this range are equipped with an integral fuel tank which can easily be removed for cleaning purposes.

These energy-efficient warm air waste oil heaters can be the ideal heating solution for the automotive sector such as car garages and workshops, but are also used widely in farm and other industrial heating applications.

Oils that can be burnt in these manual fired waste oil heater range –

• Hydraulic oils
• 35 second Heating Oil/Diesel
• Used engine oils
• Transmission fluids
• Bio diesel
• Most vegetable oils
• Linseed oil
• Rapeseed oil
• Used cooking oils

Although these heaters are classed as a multi or universal oil heater it is important to know that petro-chemical based oils or lubricants, solvents, transformer oil, thinners and any oil above grade S.A.E. 80 should not be used in these drip waste oil heaters.

This heating technology can permit the end user to recover the initial investment costs sometimes within one heating season due to the savings made from using our universal oil heater instead of a more expensive fuel oil heater. These heaters are manufactured using the latest technology and have a 12-month warranty on them, which ensures complete customer satisfaction

The high efficiency of the Flexiheat “FH” range of universal oil heaters is achieved by an integral, large heat exchanger, through which all the combustion gases have to pass before entering the flue system. Then a high capacity axial fan draws the air from within the workshop, garage or building over the heat exchanger and combustion chamber and expels this now heated warm air into the area, providing a constant recycling of this warm air.

Download the Flexiheat Brochure for manual fired Waste Oil Heaters

Firstly we have the smallest unit of the range, which is a 17 to 33 kW output model –

The model “FHMWOH17-33 ” model comes with a warm air blowing fan, which benefits the heaters performance, and will push out 1,000 metres cubed per hour of warm air.

Model description – FHMWOH 17 to 33 kW 

This warm air heater effectively heats rooms with a volume up to 800 Metres cubed based on a good insulation level of the building.

• Smooth heat power regulation from 17 kW to 33 kW output
• Oil consumption – 1.7 Litres on low fire  – 3.3 Litres on high fire
• Heater protection against overheating
• Protection against overflow of the heater
• LED diodes signalling operation or possible emergency stop of combustion
• Built-in control thermostat (the fan turns off in the shutdown function of the stove when the temperature drops below 40 ° C within the combustion chamber)
• Thermostatic pump operation supervision
• Durable housing covered with a powder coating
• Combustion chamber made of stainless steel with increased temperature resistance (acid-resistant steel)
• 50 Litre fuel tank
• Manual ignition
• an outlet panel with a hot air blower on the front wall, heat radiation in all directions,
• Hot air outlet temperature 50-70 degrees C (with air temperature inside the room of 12 degrees C)
• Blowing 1,000 m3 / hour of warm air

Then we have the largest heat output model of our universal oil heaters –

This unit designated the “”FHMWOH30-52 ” which has a 30 kW to 52 kW heat output. This waste oil heater has a high capacity axial fan providing a heated air flow rate of 5,500 cubic metres per hour.

Our 30 to 52KW larger manual fired multi oil warm air heater.

Model description – FHMWOH 30 to 52 kW 

This warm air heater effectively heats rooms with a volume up to 1,500 Metres cubed based on a good insulation level of the building.

• Smooth heat power regulation from 30 kW to 52 kW output
• Oil consumption – 3 Litres on low fire  – 5.2 Litres on high fire
• Heater protection against overheating
• Protection against overflow of the heater
• LED diodes signalling operation or possible emergency stop of combustion
• Built-in control thermostat (the fan turns off in the shutdown function of the stove when the temperature drops below 40 ° C within the combustion chamber)
• Thermostatic pump operation supervision
• Durable housing covered with a powder coating
• Combustion chamber made of stainless steel with increased temperature resistance (acid-resistant steel)
• 90 Litre fuel tank
• Manual ignition
• an outlet panel with a hot air blower on the front wall, heat radiation in all directions,
• Hot air outlet temperature 50-70 degrees C (with air temperature inside the room of 12 degrees C)
• Blowing 5,300 m3 / hour of warm air

Following is a basic heat loss calculation for our garage / workshop heaters – that you can download and calculate how much heat you require

Heat Loss Calculation for Workshop Heaters – Flexiheat UK

Waste oil heater flue installation

All of the range of the “FHMWOH” universal oil heaters have a 150mm (6″) flue pipe connection. They should be fitted with a draught stabilizer in the flue system. This is designed to stabilize and compensate the draught in the flue system. We recommend using a stainless steel flue on our universal oil heaters, aluminium flue is not allowed. If possible, please ensure that the flue system is kept internal to the building, if or when the flue exits the building , then we recommend using a twin wall stainless steel flue system.

If possible , all sections of the flue pipe system should be vertical, in which case the minimum flue height is 5 Metres. The flue should extended at least 0.5 Metres above the ridge to allow the free flow of wind around the the terminal.

Universal oil heater flue heights

Horizontal flue sections are not permitted,and bends should be avoided if possible.If you have to use bends, then the maximum angle you can use is 45 degrees, and in such cases the minimum flue length then is 7 metres.

Flexiheat waste oil workshop or garage heaters

Kroll W401 Heater Information is here and below

Kroll Oil Drip Heaters the W401 Model Features –

Technical Data for the W401 Drip Waste Oil Heater

We have just supplied spares to a unit that is 45 years old ! a testament to the quality of this German made unit.

Waste oil heaters for sale

Sometimes these heaters are referred to as waste oil workshop heaters, waste oil drip heaters, drip oil waste heater, small waste oil heater, small waste oil heater for a garage, with thousands sold since its conception , we believe we have the best Waste Oil Heater for sale on the market. Please click here to contact us via email or call us direct on 01202 822221

Download the W401 Kroll Waste Oil Heater Brochure

Download W401 Waste Oil Workshop Heater Manual

Download W401 Spare Parts Document

Download W401 Wiring Diagram