Disclosure: When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network
Here I’ll show you step-by-step how I installed a diesel heater in our Jayco Swan camper trailer.
Even though this is one of the 35 Most Popular Jayco Camper Trailer Modifications, it’s safe to say:
The instructions are useless.
So I spent A LOT of time researching how to do this…
(probably more than it took to install it)
…so I’ll also point out some of these 13 most common dos and don’ts I learned along the way.
Let’s get started with the first step:
1. Buy a diesel heater from eBay
If you’ve already got one, skip this bit and go to Step 2.
But if you haven’t?
Here’s the one I bought:
I’m very happy with it!
[Here’s its eBay link… the seller I bought it from has 99% positive feedback]
Yep, they’re affectionately known as ‘Cheap Chinese Diesel Heaters’…
…because they’re much cheaper than the original German versions BUT still consistently get the same good results
Now, should you buy a 2 kW or a 5 kW diesel heater?
There’s 2 schools of thought here:
- Buy the smaller one and work it harder so that it doesn’t get a build-up of carbon, OR
- Buy the larger one and don’t work it as hard so there’ll be less wear and tear on the fan and fuel pump (and just run it on high every now and again to burn away the carbon)
The guru of diesel heaters on YouTube (John McK) recommends the latter option…
…and since we’re in a Jayco Swan with a load of canvas, I figure it’s better to err on the side of warmer!
When I bought mine from this eBay seller it arrived in 5 days from Sydney… bargain!
[I added to their 99% positive feedback]
Want to know why I went diesel instead of gas (after having a gas heater previously)?
2. Unbox your diesel heater and check if there’s anything else you need for its installation
Like a little boy at Christmas, it was straight onto the kitchen table:
[Natalie wasn’t that impressed]
So what’s the deal with the red circles?
HINT: Make sure you get a diesel heater that comes with a muffler AND an air filter
Some of the diesel heaters are sold with “silencers” that look pretty much like the air filters…
…but bench testing shows they increase the noise!
And they don’t filter. Which makes them useless.
So if you already have your diesel heater BUT it didn’t come with either then this looks like a good combo from eBay
Anyway, here’s the extra bits I bought from Bunnings for our installation:
My shopping list was:
- Fielders 100mm Zinc Round Downpipe Pop. To create a turret to neaten up the hole in the floor ($6)
- Rubber Stopper. This is to help make the fuel pump more quiet ($3)
- Fire Resistant Silicon Sealant. To form a protective layer between the base plate and the floor ($17)
- Craftright 16 Piece Hole Saw Kit. You’ll need a 102 mm and a 76 mm hole… just a decent brand 102 mm hole saw is over $50. So yep, at $20 this cheapo set isn’t great quality, but it’s not like I’ll be using it all the time.
Double check to make sure you have:
- 12 small hose clamps, and
- 4 medium hose clamps
[my kit was short 2 of each so I had to do an extra trip to the local hardware store]
UPDATE: I’d also recommend buying a 12V isolator switch
This isn’t 100% needed, but a 12V isolator switch is handy to:
- Stop the LCD screen from drawing power when it’s not in use, and
- Preventing toddler from playing with the controls
I bought this one from this seller off eBay for about $20:
[the same type was $50 in an auto-parts store!]
3. Tools used for the diesel heater installation
This is everything I needed:
- Cordless drill and bits of all sizes
- Cordless driver and Philips head bit
- 102 mm hole saw
- 76 mm hole saw
- Socket set
- Spanner set
- Stanley knife
- Caulking gun
Doesn’t look like a lot when it’s in a list… but it sure looked like a lot when I had it everywhere!
4. Find a good spot to put your diesel heater
There’s lots of different places you can put your diesel heater…
For our Jayco Swan (and our preferences) the only logical place seemed to be in the front right corner underneath the couch
(the aftermarket radio and speakers meant I only had one option for the vent)
Some things to take into consideration when you’re choosing the location of your diesel heater are:
- What type of Jayco camper trailer layout do you have?
- What modifications have already been made?
- Are you willing to lose storage space?
- How far away is the battery?
- Where’s a good spot for the fuel can?
And the big one:
- What’s under the floor?
Before you do anything you’ll need to climb underneath to make sure there’s no chassis, gas pipes, or wiring in the way
5. Mark, measure, and then drill a pilot hole to confirm the exact placement
The planned location for our diesel heater was pretty close to the chassis.
So I put the diesel heater on top of the downpipe pop turret
(so that I could confirm the exact location that the base plate would end up)
Then I took the heater away to leave the turret behind.
This meant I could drill a small pilot hole:
Spider-Man was glad I checked!
I climbed underneath and placed the centre of the turret over the pilot hole:
It was too close to the chassis by about 30 mm.
To move the diesel heater sideways by that distance would’ve put too much of a bend in the hose…
…so the final position was on an angle.
This picture shows the final position that was determined by both chassis location and vent placement.
6. Cut a hole in the floor using a hole saw
This was definitely a case of “measure twice, cut once“
You don’t need to have a big budget for this:
I used my el cheapo Craftright 102 mm hole saw on my el cheapo Ozito cordless drill:
And it still did the job perfectly:
HINT: Cut a little from the top, then get underneath and cut from the bottom. You’ll get a MUCH neater hole.
[It’s all about preventing water ingress]
7. Outline base plate location and drill holes for securing the diesel heater to the floor
Pretty self explanatory:
8. Add a heat-resistant layer
A few different options here:
- Cut a small piece of concrete sheeting
- Cut up a heat-proof chopping board, or
- Use some fire resistant silicon sealant
I went for the last option to kill two birds with one stone (because I would’ve needed to get some silicon sealant to seal underneath anyway)
Yep, I did fill in all those gaps. That’s a lot of silicon.
9. Connect pipes and hoses to the base of the diesel heater
It’ll make things easier if you connect now
(rather than laying on your back underneath the van)
First, cut the black rubber hose into 6 even pieces
(these are the fuel-line connectors)
Here I’ve connected:
- Exhaust pipe
- Air intake hose pipe
- Fuel line connector
HINT: The fuel line is closest to the cool air intake hose, not the hot exhaust pipe… for obvious reasons
10. Put the diesel heater in position and seal the hole
Next I stuck the diesel heater in it’s final position…
…and used the silicone sealant to seal around the turret
11. Mount the exhaust pipe and connect the muffler
Okay, here’s where my initial plan would have let me down…
…I almost made 3 installation mistakes in one go!
See the little hole on the bottom edge of the muffler?
It’s a drainage ‘weep’ hole. It’s purpose is to allow water (a byproduce of the diesel heater’s combusion) to escape.
The muffler is mounted vertically, not on it’s side, to allow the water to drain out of the weep hole.
[I learned that AFTER I’d initially attached it… so I took it off, flattened the bracket, and reattached it]
The good news is when I did this it made it easier for me to avoid another common installation issue:
The exhaust pipe slopes slightly downwards to prevent water from collecting at the low point.
If there’s a bend in the pipe that’s lower than the exhaust outlet, water will collect there.
Here’s another angle of how it ended up pointing:
The exhaust points away from our van. Not under it.
Now, some might say that these are clean-burning and don’t produce much Carbon Monoxide…
…but all it’d take is for the heater to not be working properly, and next thing you know?
Carbon Monoxide trapped under the van.
12. Mount the air intake hose and connect the air filter
A few simple things here:
I mounted it so that it’s not sucking in the exhaust, and…
The air filter is facing backwards to avoid high pressure air, dirt, and bugs being pushed into the system when driving.
“And that, Spider-Man, is the heater mounted, exhaust fitted, and air intake sorted”
13. Mark and cut a hole (or holes) for the hot air vent
In this kit I got a T-Piece and 2 vents…
…but most people only ever install one vent.
So this was pretty simple:
I just traced around the base of the vent with a marker…
…then drilled it out using the 76 mm hole saw.
If these were the only 2 holes I got out of my Craftright Hole Saw Kit and then they fell apart, I’d still be happy!
14. Screw the hot air vent into its position
Pilot holes. Screws. Simple.
[my little “helper” is now a Dinosaur]
The vent cover now just snaps onto the base:
Orientated slightly downards, and towards the far end of our Jayco Swan.
15. Join the diesel heater to the vent with the duct pipe
Duct pipe, a couple of hose clamps, and a screw driver.
Nothing much can go wrong here
[just remember this will get HOT so it shouldn’t be up against anything]
“And that, T-Rex, is the hot air vent done”
16. Fix the diesel fuel tank with the fittings to connect the fuel line
There was three options for the diesel heater that we bought.
You could either make a hole and insert a nozzle into reinforced sections on the bottom or side of the tank…
…or make a hole in the top and insert the Diesel Heater Fuel Standpipe:
You might’ve noticed that compared to the first photo in this little ‘how to’ I’ve cut the standpipe with my hacksaw to a length where it’s about 50 mm from the bottom with a 45 degree bevel…
…so you can probably guess which option I went for!
Reasons I didn’t got for bottom-mounted are:
- Notorious for leaking
- Can’t mount the tank with the base resting on anything for additional support
- More prone to sediment clogging up fuel lines
Side-mounted? None of those issues.
But you lose about a 1/4 of the tank capacity.
So after a few small holes and a couple of screws:
17. Make and measure a path for the fuel line
The resting place for our diesel heater fuel tank is in the boot of our Jayco Swan.
There’s already drainage holes in the boot so I didn’t have to drill any holes:
I wanted to keep the fuel filter outside because I didn’t like the idea of diesel leaking all through our boot…
…so I used a piece of string to measure the length of the fuel line I needed.
18. Cut the fuel line to length to join the diesel tank to the fuel filter
Using my trusty piece of string, I cut the fuel line on a chopping board using a sharp Stanley Knife
[NOT a pair of scissors or side-cutters because it can compress the narrow diameter fuel line]
A couple of things to note here:
- I’ve used 2 more bits of the black rubber hose that was cut into 6 pieces to act as connectors
- There’s no gap between the end of the hose and the fuel standpipe nozzzle (pushed tight)
- I’ve intentionally used the fuel line that it came with
Some people feel the need to upgrade the hard nylon fuel line it comes with to what is used on a car or motorcycle.
If you’re interested there’s a 23 minute video on YouTube just on the fuel delivery system that changed my mind:
I nearly “upgraded” to a fuel hose from SupaCheap Auto… until I learned that the hard nylon narrow-bore fuel line is designed specifically for these systems.
19. Mount the diesel fuel tank
Here I’ve mounted ours in the boot of our Jayco Swan:
It’s dark. Protected from rocks. Free from interference from people.
It’s only mounted using the 3 tech screws and washers in the pre-drilled holes though:
Another reason I wanted to make sure that the base of the tank was supported.
I was paranoid that I’d go over a bump and the screws would pull through the tank and it’d fall off
[I haven’t heard of that happening before… but you know, belts-and-braces]
UPDATE: I’ve just changed the fuel tank to using a jerry can that has a Quick Disconnect Kit that I bought here from dieselheat off eBay for $38…
…this saves space in the boot, and makes it easier to refill as I can just take the jerry can with me
20. Mount the fuel pump (close to the tank)
So I learned that these fuel dosing pumps are more efficient at pushing than they are at sucking…
…so you mount them closer to the fuel tank, not closer to the diesel heater itself.
But they’re also notorious for making a maddening ticking noise
I came across this great idea of placing a rubber stopper between the Fuel Pump Clip and the chassis:
The fuel pump is mounted at an angle so the air bubbles created by the pump’s cavitation can escape… if they can’t it messes with the fuel dosage and also creates a metal-on-metal situation.
21. Attach the fuel filter
Unlike a swimming pool filter, diesel fuel filters are designed so that the incoming fuel comes into the outside of the basket.
This is the correct orientation:
The fuel filter is mounted before the fuel pump
(otherwise the fuel pump will get clogged up)
22. Connect the fuel pump to a primed fuel line
Here I used the piece of string to find the right length to join the fuel pump to the base of the diesel heater
Then, for the final piece of this puzzle:
I cut a piece to join the fuel pump to the fuel filter.
But before I connected the dots, I made sure I primed the fuel line:
The poor little fuel pump would have been grinding away, metal on metal, around 15,000 times before it managed to get it’s first sip of diesel
[And if it hadn’t had a meltdown, it’d surely have some arthrits for the future]
So now we have a mounted diesel heater, with vents, and a fully connected fuel system…
23. Connect the wiring harness to the fuel pump
The wiring for these things was the simplest part of the installation:
They are all VERY different connectors so you couldn’t stuff it up if you tried.
For the wires for the fuel pump I drilled a small hole, popped off the connector, and fed the wires through the hole:
Then re-joined the connector, plugged it in, and neatened everything up with some cable-ties:
24. Mount the Digital Thermostat Controller
I failed to take a photo on this step… so here’s one that I took AFTER the final step!
This was pretty easy though:
Join the only 2 connectors that fit each other.
Screw the back of the controller into the wall.
Hide the wires.
25. Connect the wiring harness to the battery
This step was simple:
The wiring harness came with a long red wire (that has a fuse in it).
Attach the red wire to the red terminal on the battery.
Then, attach the black wire to the black terminal on the battery.
Once I did that…
26. Test the diesel heater to make sure it works
I pressed the ‘On’ button, and it worked. Very Well.
I let it run for about 10 minutes on high.
It was very warm.
The rubber stopper worked…
…no ticking noise!
How hot does the case of a diesel heater get?
This was the result after 10 minutes on high:
Yes, that’s my comfortably holding my hand on it.
How hot does the base plate of the diesel heater get?
Here’s the meat thermometer again:
Definitely warm to touch… but I couldn’t fry an egg on it.
27. UPDATE: Install a 12V isolator switch
This one is an update, a modification that I put in towards the end of winter…
…I installed this 12V isolator switch that I bought here off eBay underneath the seat
[where it’s easily accessible, but little hands can’t reach it]
The reasons for this were:
- Stop the LCD unneccessarily drawing power when not in use, and
- Stopping our little Eddie from playing with the controller
I think it’s $20 well spent!
Summary: we’re happy with our Jayco Swan diesel heater installation
We’re happy with our diesel heater…
…it’s definitely going to make life in our Jayco Swan more comfortable this winter!
[It’s one of these 7 Tips to Keep Your Jayco Camper Trailer Warmer in Winter]
As I was writing this I said to Natalie:
“This is the article I wish I had when I was installing our diesel heater”
So comment below:
Is there any steps you want more detail on? Anything I’ve missed?
If you’re after one of these diesel heaters, here’s the eBay link to one like we bought
While you’re at it, make sure you get a Carbon Monoxide detector too. We have this one by Quell:
They’re about $45 from eBay, or just pop down to Bunnings and get one (more like $60 there though)
Otherwise, keep warm, and you might find some other idease here at the 35 Most Popular Jayco Camper Trailer Modifications