Installing a diesel parking heater

Driving a very cold electric car.

Driving a very cold electric car.

Say what you will about internal combustion engines, but they produce a lot of heat for beating those winter chills. This means that I’ve mostly been warm for my 20+ years of driving and when I adopted my current electric car I just wasn’t prepared to give up comfort for the sake of extra range.

As you’ll know from my most recent Kiwi EV adventure, where I tried all manner of alternative car heating methods, nothing was quite as good as simply cranking up the car’s heater. But, boy, the car’s heater absolutely murders the car’s range. For example, as shown in the photo at the top of the page, a few days ago I needed to drive 87 km (54 miles) which is fine; my car can manage such a distance effortlessly… if I don’t use the car’s power-sucking heater, that is. So I made the snowy journey and subsequently froze.

Diesel parking heater - Gavin Shoebridge

My new diesel parking heater arrived! It looks terrified.

So imagine my joy when my new diesel parking heater arrived all the way from China! It’s a clone of an Eberspacher Airtronic D2 which I bought online for €350 ($380 USD).

Eberspacher Airtronic D2 copy.

My new diesel parking heater: an Eberspacher Airtronic D2 copy.

It burns diesel to blow hot air. I would have bought the diesel water heater, like many other Mitsubishi iMiEV / Citroen C-Zero / Peugeot iOn drivers, but the much higher cost (coupled with my modest income) simply wouldn’t allow it. The problem, however, is that no one’s installed a diesel air heater in an electric car yet, as far as I know. Being a pioneer is sometimes frightening!

an electric car buying gas

Legal alien: an electric car buying gas?

First thing’s first: I needed diesel. Over the past three weeks I tried very hard to source biodiesel, because it’s less harmful to our fragile environment, however I hit a brick wall time and time again. I contacted three individual manufacturers of biodiesel, both in Slovakia and in Austria, and despite almost a dozen emails and three phone calls I was given the same answer: “no”.

Actually, to be honest, a couple of manufacturers demanded to know why I wanted their product before telling me they couldn’t help me. Two firms said they only sell to other suppliers, the third firm told me he’d get back to me “after checking with management”. He soon stopped responding to my emails. Honestly, I tried to do the right thing, but none of the biofuel companies would help me. So, I very reluctantly took my electric car to the local gas station and filled up a container with dirty, carcinogenic petrodiesel.

fuel container

People actually start wars over this horrible stuff.

After not buying any gas or diesel for 16 months (and counting), my lovely wife Veronika took pity on me. She saw that I didn’t want to buy any fossil fuel, so she did a wonderful thing: she bought me the container of diesel as a gift. Now that’s true love. 🙂

The world's most adorable little fuel tank!

The world’s most adorable little fuel tank!

In the meantime, my little fuel container also arrived. It holds around 1.5 litres (0.4 gallons) of fuel and I reckon it should offer enough juice to operate the heater for at least 3 hours.

A carbon monoxide detector. You can never be too careful.

A carbon monoxide detector. You can never be too careful.

I also bought a carbon monoxide detector, just in case. After nitrogen oxide (NOx), carbon monoxide is the second greatest pollutant from burning diesel, so if any enters the cabin due to an exhaust problem, I’d like to know about it.

 Diesel Parking Heater close up - Aliexpress chinese clone of Eberspacher parking heater

My diesel parking heater with the lid removed.

Before attempting to install the parking heater, I took the plastic cover off to figure out how it all works. Upon doing so I realised how incredibly simple it turned out to be.

 Diesel Parking Heater close up - Aliexpress chinese clone of Eberspacher parking heater

The parking heater is remarkably simple.

Looking at the unit close-up, you can get a feel for how non-complex the system really is. Basically, how it works is this: the fuel enters the unit and is burned, making the finned part at the back get hot, then the exhaust is spat out through the exhaust pipe underneath the unit. Meanwhile, a fan pushes air over the finned parts, which gets nice and warm and heats up the cabin.

 Diesel Parking Heater close up - Aliexpress chinese clone of Eberspacher parking heater

Did I mention how simple it is? That’s all there is to it!

I connected all the cables together and, as you can see in the above picture, there’s really not much to it. The electrical side is just a matter of connecting the positive and the negative to the car’s battery, then connecting the fuel bottle, then extracting the exhaust. It sounds so simple even I could do it!

The parking heater controller.

The parking heater controller.

The controller which came with the unit it quite basic. It has three buttons on the bottom (Manual mode, Automatic mode, Off) and a turning knob to adjust the heating temperature.

The parking heater 12v fuel pump.

The parking heater 12v fuel pump.

The other major component is the little fuel pump above. I don’t know if anyone’s ever said this about a fuel pump before, but it’s actually kinda adorable.

Though be warned: it’s not immediately clear in which direction the fuel pumps. There should be an arrow signalling the fuel flow direction but I couldn’t find it. I discovered upon testing it (and getting a splatter of diesel on my trousers) that the fuel comes out towards the power socket (to the left in the photo above).

So, time to connect it up and test it out!

running the diesel parking heater

Testing, one two three!

I put a little diesel into a jar and rested the heater on axle stands, with the exhaust aimed outside. I connected the system up to the car’s battery and pressed the “on” button…

And nothing happened. Well, it made a couple of whirring noises, then beeped “Error 1” at me, which means a power issue. That was odd. Also, why didn’t I hear the fuel pump clicking? Surely it’s not absolutely silent?

I dug around in the manual and found a special mode which forces fuel into the unit. I assumed that was the problem, so I pressed a button combo on the controller and… the pump started clicking quickly. The pump was quieter than I thought, but I guess that’s a good problem on an electric car.

After about 30 seconds of pumping, I could see the little fuel filter had filled up and fuel was entering the heater, so turned off the unit, took a deep breath, and then turned it onto manual mode…

Nothing happened for a few seconds. Then a whirring noise. Then a noise like a furnace starting up. Then a pile of black smoke started billowing from the exhaust pipe, before coming swiftly inside. Gah.

smoking diesel parking heater

Excuse me, this area is non smoking.

I quickly opened up the main garage door to let the cancer out, but at that moment it burned off all the diesel and oil inside (from the factory, I assume) and started to run quite clean, with no visible smoke. I put the cover back on the top of the unit and the air was channelled over the finned area at the back of the heater, and out of the vent facing me.

The heat coming out of the unit was nice and hot. Hotter and faster than the same heat from the standard 2 kW fan heater I used to preheat the car.

This is good. It means it works. That was also the easy part. Now comes the really really hard part: deciding on where to install it in the car.

According to the brochure, this unit it designed to go inside cars, vans, boats and trucks – but will it fit in my electric car?

parking heater in glove box

Would it fit in place of the glove box?

The first place I wanted to attempt was in place of the glove box, however it was doomed from the start. While the unit could physically fit inside the glove box, there were too many other problems – the largest being the routing of the hot exhaust.

As you can see in the photo above, the dashboards of the iMiEV are absolutely full. This meant that even if I could safely route the exhaust outside and away from melting passengers shoes, I’d still have the problem of installing ducting to channel the air towards me or the windscreen, and there’s simply not enough room to install a pipe anywhere in that jam-packed dashboard.

Another thing to remember, is that wherever I install this system, it has to be easily removable. In around 12 weeks I’m going to be taking it out again because it’ll be spring, so it has to be somewhere logical and safe.

The floor of the car’s cabin was also out of the question because 1: it’d intrude on passenger comfort, and 2: because of the battery under the centre of the car, I’d have to drill into/near the frame of the car to route the exhaust out.

It would be too dangerous to mount this indoor heating unit outside the car due to the risk of short circuit from water splashes and road salt, but I soon found a winner. Yes, crawling all over the car and trying numerous locations, I found the ideal place.

heater stand

“He stood me up!”

I popped up to the hardware store and bought a bunch of strong, adjustable L-brackets so I could fashion a sturdy yet simple stand to hold the heater. The image above shows the unit incomplete, but you get the idea.

Then, after checking and rechecking, I grabbed the heater and the drill and started making holes!

diesel parking heater in the trunk

In the boot: by far the best position.

Installing the parking heater in the boot (trunk) of the car was the logical choice for many reasons, from concerns about moisture, road salt, safety, convenience, comfort, removability, easy access in an emergency, ease of re-installation etc etc etc, you get the idea.

Doing it this way also allowed the fumes from the unit to be safely dispersed under the rear of the vehicle away from the passenger air intake. This was coincidentally the exact same place as where the exhaust pipe goes on the gas version of this car. It was a no-brainer, so I got busy installing it.

An electric car with an exhaust pipe.

Crikey. An electric car with an exhaust pipe.

Installing the parking heater onto the motor cover was also a smart move in terms of motor and controller access, because you simply disconnect the exhaust pipe from the heater, and the entire cover (with heater bolted on) simply lifts upwards.

parking heater install

Almost done: connecting the heater cabling.

With the heater installed, I got busy wiring it up.

The next issue was where to put the fuel tank. I decided to go with convenience, so I mounted the fuel tank next to the heater unit, paying close attention to the exhaust pipe in the case of a diesel spill. Although diesel may not be as combustible as petrol or ethanol, I want it to be safe for the short time I have it in the car.

testing parking heater

Let the testing begin: round two!

With the wiring connected and the fuel tank connected securely to the frame of the heater stand, I clamped and triple-checked all the fuel pipe connections.

Next comes the fuel, followed by outdoor testing. I added around a litre of diesel to the little tank and primed the system using the hidden fuel-pump only mode. Then, after many hours of careful work… I turned the unit on.

diesel parking heater exhaust

Success! Dirty, smokey success!

It works! It actually works!

I ran the unit on high mode for a good 30 minutes to burn off any residue and to monitor the effects of the hot exhaust in the two places where it has contact with metal. I was also paying close attention to the fuel tubing and its connections, ensuring no air was leaking in – and no fuel was leaking out.

There was a faint “cooking” smell (like an old engine) in the air inside the car, but it soon dispersed. I assume there was a thin film of oil or diesel on the exhaust.

After everything was running hot and clean, I let the unit power down and switched it off, then put the car back in the garage to check once again for fumes, heat induction and condensation. You might think I’m being pedantic, but flammable liquids in cars genuinely freak me out. You can’t be too careful.

testing diesel parking heater

Day two: testing continues.

The next day I continued testing in the daylight. Now I was able to experiment more, playing with the unit’s speed controller and thermostat. I ran the unit hard once again, but this time also let it idle at a constant temperature.

Once I was satisfied it was safe, I closed the doors and ran it as it’s intended, checking to see how well it heats up the interior. I’ll be honest: I was expecting the worst, considering it’s all the way down the back of the car. I expected it to be weak and… well, a waste of money.

But I was pleasantly surprised. After only about 15 minutes of the unit operating during a windy, chilly morning, the car’s interior had reached more than 35°C (95°F) which was completely unexpected – especially considering how far away it was from me. One thing that was noticeable however, is that the floor of the driver’s foot-well was colder than the rest of the car. This is something I’ll play with over the coming days, as the heater comes with a long heating extension pipe. I might try and run it under the driver’s seat to the foot-well.

Diesel parking heater installed in an electric car


And there you have it! I measured and cut out a hole into the car’s carpet and foam insulation, making sure it’s big enough for heat safety or in the event of shifting during bumpy roads. It’s also, just like the heater, easily removable.

At present the unit is consuming air from the cabin which seems to be fine as it’s a very small amount and I drive with the vents open anyhow. Having said that, I’m ready to install a vent hole below the unit if I find it necessary.

The verdict? So far so good. I’ve already driven around a fair amount with the unit running, stopping to check it regularly. Of course I have my nose checking the air constantly, along with the carbon monoxide detector, but I’m also carrying a smoke alarm for added safety and a dry-powder fire extinguisher.

After only four days of testing, I can tell you honestly that this diesel heater is like a range extender of sorts. My daily commute is around 35 kilometres (22 miles) with regular extra driving and errands, and seeing as I like to be warm, it means I regularly have the car’s heater going – if I know I’m not going to be driving outside of my normal circuit, that is. Unfortunately, the heater takes its toll on the battery. However, since installing the diesel heater, I can now be warm without range anxiety:

electric heater compared to diesel heater

Electric vs diesel: the results speak for themselves.

The above picture shows my daily commute in cold weather, using the heater from a full charge (from home to work to home again). As you can see, the diesel heater means I can truly use my car in winter. No more gloves. No more woolly hats. No more shivering. I have an electric car, without any downsides. All thanks to a €330 Chinese heater.

After four days of thorough testing there are no issues to report as yet. I found a screw that had loosened itself after my twice-daily inspections, but other than that, its been smooth sailing. Testing will continue over the next few days and weeks as I learn more about the unit and the fuel system so watch this space. Oh, and remember, safety first!

As always, you can watch a video version of the entire saga below:

Note: For those interested, the heater I bought is available on the Chinese shopping site Aliexpress by clicking here. It was the cheapest example (including shipping) of any other diesel air heating option.

Also, I scanned the instruction manual for the Chinese-made diesel parking heater. If you wish to view or download it, click here.