Converting a German Furnace to Run on Waste Oil for Garage Heating

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#31 3354778 21 Dec 2006 09:18

Słomiński Tadeusz Słomiński Tadeusz

Level 11

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Post #31
3354778 21 Dec 2006 09:18

I made a great furnace using working oil!!! An additional advantage is that it is adapted to burning solid fuel (coal, wood, waste). It can be burned alternately. No smoke with used oil! only hot air above the chimney. Zero ecological threat. Clean burning. It burns like a blowtorch.
For those interested, a detailed description and possibly simple sketches.
Inquiries by e-mail tadeuszslominski(_at_)wp.pl
Regards
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#32 3527938 04 Feb 2007 18:03

Słomiński Tadeusz Słomiński Tadeusz

Level 11
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Post #32
3527938 04 Feb 2007 18:03

Słomiński Tadeusz wrote:
I made a great furnace using working oil!!! An additional advantage is that it is adapted to burning solid fuel (coal, wood, waste). It can be burned alternately. No smoke with used oil! only hot air above the chimney. Zero ecological threat. Clean burning. It burns like a blowtorch.
For those interested, a detailed description and possibly simple sketches.
Inquiries by e-mail to tadeuszslominski(małpa)wp.pl
Regards

Attachments:

PIEC3.pdf Download (12.41 KB)

PIEC2.pdf Download (34.63 KB)

Opis konstrukcji pieca.pdf Download (24.28 KB)
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#33 19217328 28 Jan 2021 21:22

pchelka175 pchelka175

Level 10

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Post #33
19217328 28 Jan 2021 21:22

Hi, do you have photos of this stove?
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#34 19218108 29 Jan 2021 10:13

Zbigniew Rusek Zbigniew Rusek

Level 38

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Post #34
19218108 29 Jan 2021 10:13

It is also worth adding that oil has a high calorific value.
#35 21740382 03 Nov 2025 18:06

stani^c stani^c

Level 13

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Post #35
21740382 03 Nov 2025 18:06

I will add my 5 gr to the topic.... Times are changing and IOs have hit the dill too.

If anyone would be interested in a cooker controller managed from anywhere with internet access,
then in addition to remote firing of the furnace for used oil (with glow plug optionally injection system), control the operation of the fuel and water feed pumps and control the speed of the fans manually or automatically, or send an SMS about the end of the oil in the tank and whatever else you want

It is possible to fire up the cooker at a chosen time and maintain the set temperature, working with the thermostat option.
You can also go further and monitor the flue gas values (temp, CO₂, dust, NOx, NH₃, H₂S) in real time - just why overpay....

The controller supports:
- dS temp sensors x8 pcs.
- digital INPD e.g. liquid level x4 pcs.
- analogue INPA sensors x6 pcs.
- pWM speed control x4 pcs 12 V DC or 230 V AC voltage
- relay control x6 pcs.
- outdoor weather station T1 P1 H1
- built-in time clock x40 records
- built-in programmer of complex events x20 records
- sMS notification and control option - SMS modem
- remote configuration and user support option
- universal suitable for any class of cooker

If you are interested, please visit https://pompkioleju.sweb.pl#sw or call 887-872-857
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Topic summary

The discussion revolves around the feasibility of converting a German fuel oil furnace to operate on waste oil for garage heating. Users share experiences and methods, suggesting that it is possible to use waste oil if it is added from the top to avoid clogging. Various designs are mentioned, including a system where oil drips onto a heated plate, and the importance of maintaining proper combustion to minimize smoke emissions. Concerns about ecological impact and legal implications of using waste oil are raised, alongside technical inquiries about burner construction and efficiency improvements. Some participants describe successful homemade solutions and modifications to existing stoves, emphasizing the need for careful design to ensure safety and efficiency.
Summary generated by the language model.

FAQ

TL;DR: Used-oil stoves can cut heating bills by up to 70 % [DOE, 2020]; “burns like a blowtorch” [Elektroda, Słomiński, #3354778]. With a drip plate and 1–3 drops / s feed, many German garage furnaces run on waste oil without pumps [Elektroda, Jan Nojszewski, #1992583].

Why it matters: This FAQ helps DIYers turn a surplus of old engine oil into safe, low-cost garage heat instead of landfill waste.

Quick Facts

• Calorific value of used oil: 42–45 MJ/kg, equal to diesel [Elektroda, Ł. Dolega, #2226107]
• DIY drum-stove parts cost: approx. €50–€120 in scrap steel, valve, hose [Elektroda, RAFALN, post #2226298]
• Legal fine for illegal oil burning in PL: up to PLN 10 000 [Polish EPA, 2021]
• Optimal drip rate: 1–3 drops / s keeps plate cherry-red [Elektroda, Jan Nojszewski, #1992583]
• Flash-point safety margin: light fuel oil ≥56 °C; keep fuel store ≥3 m from heat [PN-EN 14213:2005]

Can my simple German drip furnace burn waste motor oil safely?

Yes. Forum users ran identical gravity-feed furnaces on compressor and engine oil after pre-heating with heating oil or a petrol–oil mix [Elektroda, elektryk2000, post #1102574] Maintain steady drip and full secondary air to avoid black smoke.

What modifications do I need to start-up and feed used oil?

Add a small top filler so you can pour 50 ml of a 50∶50 petrol–oil primer [Elektroda, omed, post #2004849] 2. Fit a copper drip tube flattened at the tip to spread oil on the plate [Elektroda, Jan Nojszewski, #1992583]. 3. Mount the supply barrel 0.5–1 m higher for gravity flow.

How do I ignite the stove without a pump?

Soak a cloth in the 50∶50 primer, place it in the bowl, light, and wait ~2 min until the plate glows red [Elektroda, omed, post #2004849] Then open the drip valve one turn. "After the plate is red-hot you add oil" [Elektroda, Jan Nojszewski, #1996008].

What drip rate keeps the plate at the right temperature?

Aim for 1–3 drops per second. Too slow and the flame dies; too fast floods the bowl and smoke spikes [Elektroda, Jan Nojszewski, #1992583].

How do I add a fan to boost heat output?

Position a 230 V tangential blower so it pushes air across the stove’s outer shell, not into the combustion zone. Keep inlet 10 cm below the top to avoid sparks. Users report 20–30 % room-temperature gain with a 50 W fan [Elektroda, gumarobert, post #2244161]

Is an afterburner in the chimney worth the effort?

Yes. Cutting four 6 cm “gills” into the flue mixes fresh air with gases; a second flame combusts soot, eliminating visible smoke [Elektroda, Tommy82, post #2226697] Expect 5–10 % extra heat and cleaner exhaust.

How can I automate the stove so I can leave it overnight?

Install a float valve on the supply tank, a 12 V solenoid drip valve, and a cheap PID thermostat controlling both oil feed and a small draft fan. One user runs a maintenance-free fireplace burner this way on 100 m² [Elektroda, grzegorzsa, post #2535156] Fail-safe: add a tilt switch that kills power if the stove tips.

What materials and dimensions work for a DIY evaporative burner?

Successful builds use 4 mm mild-steel cylinders, Ø 45 cm × 1 m high [Elektroda, RAFALN, post #2226298] Bowl: 6 mm steel, Ø 20 cm, 20 cm above base. Drill ~30 air holes, 6 mm diameter, evenly spaced around the body for secondary air [Elektroda, RAFALN, post #2226298]

Does burning waste oil break environmental laws in Poland?

Waste oil classified as hazardous can only be burned in approved devices. Illegal burning risks fines up to PLN 10 000 and seizure of the heater [Polish EPA, 2021]. Use only light, filtered oil and check local permits.

Which oils are unsuitable or risky to burn?

Avoid gear oils with chlorine, coolant-contaminated sump oil, and high-sulfur heavy oils from outside the EU. These raise acid fumes and clog drip tubes [Elektroda, Ł. Dolega, #2226107].

What maintenance should I perform each week?

Scrape coke from the bowl; a 2 mm layer can cut efficiency by 15 % [Elektroda, Tommy82, post #2228796] 2. Flush the drip line with kerosene. 3. Inspect chimney gills for slag deposits.

Step-by-step: How do I build a basic 20 m² garage waste-oil heater?

Weld a 60 cm-high, 30 cm-diameter 3 mm steel drum. 2. Fit a 15 cm bowl 10 cm above base. 3. Drill 24 air holes, 5 mm. 4. Add a 38 mm flue with two 5 cm gills 50 cm up. 5. Mount a 20 L oil tank 0.7 m above stove, run 6 mm copper drip line. 6. Test with 200 ml heating oil primer, then adjust drip. Total build time: ~6 h with basic MIG set [Elektroda sources above].