
The Thermoheat dual heater is a portable heater that can burn diesel fuel or kerosene. While diesel burns hotter and cleaner than kerosene, it can be problematic to ignite in multi-fuel units. Kerosene, on the other hand, produces less heat but has a less offensive odour. The use of diesel fuel in the Thermoheat dual heater is a viable option, but it is important to consider factors such as fuel availability, cost, and potential issues with ignition and odour.
| Characteristics | Values |
|---|---|
| Fuel type | Diesel, Kerosene, Jet A, K1, LPG, ULSD |
| Ignition | Difficult with straight diesel |
| Burn quality | Diesel burns hotter, cleaner, and less smelly than kerosene |
| Cost | Diesel is cheaper than kerosene |
| Odor | Kerosene produces less odor than diesel |
| Safety | Carbon monoxide production, potential for CO poisoning |
| Maintenance | Kerosene may be preferred to avoid nozzle clogging |
| Performance | Diesel performs well in colder temperatures |
| Ventilation | Diesel requires good ventilation due to fumes |
| Usage | Not recommended for long-term use due to potential wear and tear on furnace components |
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What You'll Learn

The Thermoheat dual heater can burn diesel fuel
Firstly, diesel fuel tends to burn hotter than other types of fuel, such as kerosene. This higher burning temperature can be advantageous in extremely cold environments, providing more effective heating. However, it is important to be cautious of the increased heat output, as it can accelerate the wear and tear on the heater's components, potentially reducing its lifespan over time.
Another consideration is the availability and cost of diesel fuel. Diesel is generally more accessible and affordable than kerosene, especially in rural areas. This makes it a convenient option for those who may have limited access to kerosene supplies. However, it is worth noting that diesel prices can fluctuate, and in some cases, it may be more expensive than heating oil.
Additionally, the odour produced by diesel fuel is an important factor to take into account. Diesel tends to emit stronger fumes with a more noticeable smell compared to kerosene. While proper ventilation can help mitigate this issue, it may still be a concern for some users. On the other hand, kerosene produces less odour, making it a more pleasant option for those sensitive to strong smells.
Furthermore, it is crucial to ensure that the diesel fuel used is of the appropriate type for the heater. Diesel fuels are typically classified as Diesel #1 or Diesel #2, with Diesel #1 being a preferred option for heaters as it burns cleaner and produces less odour. Diesel #2, while more readily available, may require additives such as isopropyl alcohol to be safely used in heaters and prevent clogging.
In conclusion, while the Thermoheat dual heater can burn diesel fuel, it is important to carefully consider the advantages and disadvantages of using diesel over other types of fuel. Factors such as heat output, cost, odour, and fuel availability should be taken into account to make an informed decision that aligns with the user's specific needs and preferences.
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Kerosene is a less odorous alternative
Kerosene is a suitable alternative fuel for the Thermoheat Dual Heater. It is a less odorous option compared to diesel fuel, as many users have reported a strong smell associated with burning diesel. Kerosene produces "much less odor" according to one user, while another states that it "doesn't smell when it's running".
However, it is important to note that kerosene may not be readily available at gas stations, and it tends to be more expensive than diesel. Additionally, kerosene burns at a slightly lower temperature than diesel, which may be a consideration for some users.
When using kerosene in a Thermoheat Dual Heater, it is important to ensure good ventilation, as with any fuel type, due to the production of carbon monoxide. It is also crucial to follow safety procedures, as kerosene has a lower flashpoint than some other fuels, making it easier to ignite.
Some users have reported successfully using a mixture of diesel and kerosene in their heaters, which can reduce the strong smell of diesel while also being more cost-effective than pure kerosene. However, it is important to exercise caution when mixing fuels, and it is always recommended to consult the heater's instructions and safety guidelines before use.
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Diesel burns hotter and cleaner than kerosene
The Thermoheat dual heater can burn both diesel and kerosene. While kerosene burns cleaner and has less odour, diesel burns hotter and is more readily available.
Diesel burns hotter than kerosene because it is a heavier fuel, producing more power and heat (BTUs). Kerosene was originally designed for wick lamps and performs better in colder climates, but under normal conditions, diesel is more efficient.
Kerosene burns cleaner than diesel, with less lubricity, which can cause issues with fuel pumps and other engine parts. However, diesel burns cleaner than kerosene in the sense that it produces less soot. The ignition of diesel can also be problematic, often requiring a custom ignition system.
In terms of cost, diesel is generally cheaper than kerosene, although prices can vary depending on location. Some people opt to mix diesel and kerosene to achieve a hotter, cleaner burn that is more cost-effective than using kerosene alone.
Both diesel and kerosene produce carbon monoxide (CO), so adequate ventilation is critical when using either fuel.
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Diesel may be used as a substitute for heating oil
While diesel and heating oil are derived from the same crude oil through a refining process, they are not identical. They differ in viscosity, energy efficiency, cost, and the additives used. Heating oil, also known as a "kerosene mix", has a lower viscosity, making it more efficient for home heating.
In an emergency, diesel can be used as a substitute for heating oil. However, it is not recommended for long-term use due to differences in additives and intended applications. Heating oil is primarily used for residential and commercial heating systems, while diesel fuel is used for construction machinery, agricultural vehicles, and off-road vehicles. Additionally, diesel burns hotter, which is not ideal for the furnace.
The use of heating oil in diesel engines is prohibited. Heating oil has a high sulfur content, and its contaminants can harm vehicles or equipment. On the other hand, diesel is taxed at a higher rate, making it less cost-effective for heating purposes.
Some heaters, like the Thermoheat 125K, can burn both diesel and kerosene. However, users have reported issues with diesel fuel being dirty and plugging the nozzle, recommending the use of kerosene for a slightly lower heat output and far less odor. Mixing diesel with kerosene can be a solution to reduce fumes and achieve a hotter, cleaner burn at a lower cost.
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Diesel is more expensive than kerosene and heating oil
The Thermoheat 125K heater is a portable diesel heater that can burn diesel or kerosene. While diesel burns hotter and cleaner (with less smell), some users have noted that diesel fuel can be dirty and clog the nozzle. Kerosene, on the other hand, produces slightly less heat but far less odour. It is important to note that kerosene should not be used in vehicles with diesel engines, as it is illegal and can have negative consequences if discovered.
Regarding the cost comparison, diesel fuel is generally more expensive than kerosene and heating oil due to the inclusion of road taxes. However, the prices of these fuels can vary depending on supply and demand. For example, during the winter, the demand for heating oil increases, which can drive up its price relative to diesel. Additionally, purchasing heating oil ahead of the cold season or exploring payment options with suppliers can help manage price fluctuations.
The distinction between diesel and heating oil lies in their intended applications and additives. Heating oil, also known as a "kerosene mix" or "home heating oil winter blend," is primarily used for residential and commercial heating systems. Diesel fuel, on the other hand, is used for construction machinery, agricultural vehicles, off-road vehicles, and non-highway applications. While both are derived from crude oil and have similar boiling points, their specific additives and tax regulations differentiate their uses and taxation.
To summarise, while the Thermoheat 125K heater can operate with either diesel or kerosene, the choice between the two fuels depends on various factors. These include performance, odour, and cost considerations. Diesel, despite being more expensive due to road taxes, may be preferable for those seeking higher heat output and cleaner burning. However, kerosene is a more economical option and produces less odour, making it a suitable choice for those prioritising cost and odour reduction.
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Frequently asked questions
Yes, the Thermoheat dual heater can burn diesel fuel. However, it is recommended to use kerosene if your model supports it, as diesel fuel can be dirty and clog the nozzle.
Diesel burns hotter and cleaner (with less smell) than kerosene. However, kerosene produces less heat and is slightly more expensive.
Diesel fuel is usually cheaper and more available, especially in rural areas. It can also be used as a substitute for heating oil in a pinch.
Yes, it is important to ensure proper ventilation when using diesel fuel to avoid carbon monoxide poisoning. Additionally, diesel should only be used as a short-term solution as it burns hotter and can wear down the components of the heater over time.










































