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

 Output range 20kW/ 68,240 BTU’s to 55kW / 187,660 BTU’s

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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is no longer manufactured, spare parts are still available for the unit for the foreseeable future, this unit is now superseded by either the Flexiheat”FH” range of multi or universal oil heaters , a waste oil workshop and garage heater that in reality in a multi fuel warm air heater.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 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.

Although these heaters are classed as a multi or universal oil heater it is important to know that petro-chemical based oils, solvents, transformer oil, thinners and any oil above grade S.A.E. 90 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 depending on the model (as we do one version that is only a radiant heater) 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.

In order to increase the efficiency of these universal oil heaters, we have designed and manufactured innovative air recuperators, due to this upgrade, the efficiency of our multi oil heaters has improved substantially.

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Download the Flexiheat Brochure for ” FH” Waste Oil Heaters

Firstly we have the 3 smallest units of the range, which are all 20 to 29 kW output models –

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The model “FH105” model comes with no fan and thus is a radiant heat only waste oil heater, the we have the “FH105F” which benefits from a galvanised body, making it a more economical heater and has a warm air blowing fan, which benefits the heaters performance, and will push out 450 metres cubed per hour. Lastly, we have the “FH115” unit, which has a 600 metres cubed per hour fan fitted to the unit.

Then we have the medium heat output range,as shown below –

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The “FH125” and the “FH1250” units have the same heat output of 29 kW to 39 kW, but the “o” model has a galvanised body, making it a more economical heater, for when price is an issue. They both have warm air distribution fans fitted, which are rated at 1,000 metres cubed per hour.

The “FH135” model has a higher heat output of 29 kW to 42 kW, and also has the 1,000 metres cubed per hour warm air fan fitted.

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

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Both have the same heating output range of 39 kW to 55 kW, and benefit from a high capacity axial fan providing a heated air flow rate of 2,660 cubic metres per hour.The “FH145C” model differs from the F version in that it has a combustion air inlet of 315mm in diameter, that allows you to duct fresh air into the heater for the combustion process from outside. Thus, ensuring the combustion fan draws in only clean air from the outside the building, and ensures that no dust, vapours or oxygen can be sucked into the heater from the workshop floor.

This range is also available with a small hot water heat changer that can produce hot water for either a central heating system or for domestic hot water demands. The output of this is not large at 6 to 8 kW of output, but nevertheless it can be a great solution for a garage or workshop that has a small office that requires heating via a wet system or requires domestic hot water, via a calorifier or cylinder for washing up or bathing. This version of the heater is designated with the reference “WH” after the figure number.

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A waste oil drip heater that can also produce hot water for a heating system or domestic hot water for bathing from Flexiheat UK

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 “FH” universal oil heaters have a 150mm (6″) flue pipe connection.All of the heaters are supplied with a draught stabilizer , which is mounted in a tee piece. This draught stabilizer 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.

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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.

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Kroll W401 Heater Information is here and below

Kroll Oil Drip Heaters the W401 Model Features –

  • 35 kW nominal heat input
  • High delta T (80 kelvin)
  • High/ Low manual heat regulation
  • Flame failure safety feature
  • Manual ignition
  • Self-contained oil tank with option for external fuel supply
  • Heavy gauge steel casing with durable powder coated finish
  • Available with or without cross flow fan

Technical Data for the W401 Drip Waste Oil Heater

Model   W401K
Nominal heat inputkW35
Nominal heat outputkW29
Air deliveryM³/h820
Temperature rise (∆T)kW80
Oil consumption *kg/h1.9 – 2.8
Electrical connectionV/A230/0.4
Electrical power consumptionkW0.09
Flue gas pipeØ mm150
Tank contentlitres24

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