 | Home > Maintenance & Modifications > Webasto Diesel heater intake |
 
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| 34064 Member Since: 12 Dec 2023 Location: South Central Posts: 201   
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Good Evening
I am in the process of fitting my rebuilt webasto airtop underneath my cubby box in my 110 I was just wondering how people have routed the air intakes with the possible water ingress from wading? Many thanks in advance Tom 110 Td5 Ex Utilities slowly converting into a pop top camper one day Build thread:https://www.defender2.net/forum/post1024784.html#1024784 |
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3rd Jan 2025 6:52pm |
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| s55shh Member Since: 30 Dec 2019 Location: staffs Posts: 194
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pretty sure mine intakes from in the cab. Exhaust goes out down beneath so is at risk if deep fording
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3rd Jan 2025 7:23pm |
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| revd Member Since: 20 Apr 2024 Location: England Posts: 151
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The air drawn in from the cabin is the air to be heated. Completely separate from combustion air intake which is from underneath, the pipe on mine is routed adjacent to the transfer box. Should be fine as long as the heater is not operating when wading
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3rd Jan 2025 9:21pm |
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| 34064 Member Since: 12 Dec 2023 Location: South Central Posts: 201
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Many thanks for the useful information much appreciated 110 Td5 Ex Utilities slowly converting into a pop top camper one day
Build thread:https://www.defender2.net/forum/post1024784.html#1024784 |
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4th Jan 2025 4:08pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8099  
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Mine has the air intake next to a chassis outrigger.i don't run it when wading! Check intake after wading if the plastic end cap thing is fitted, that can hold water. Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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4th Jan 2025 8:09pm |
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| julian Member Since: 17 Feb 2017 Location: Devon Posts: 131 
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If youre significantly concerned, take the air for combination from inside the vehicle.
Sure, you'll get a minor drop in efficiency, but even domestic central heating boilers have only been balanced in more recent years, so, whilst a balanced system does gain you efficiency, it's not as if it's shockingly out of place to run unbalanced. Our lounge log burner is unbalanced. Balanced log burners do exist, but they're not mandatory yet. |
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4th Jan 2025 8:44pm |
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| 34064 Member Since: 12 Dec 2023 Location: South Central Posts: 201
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Thanks some interesting reading there much appreciated just waiting on some bits from YRM before we fit it back in the Defender 110 Td5 Ex Utilities slowly converting into a pop top camper one day
Build thread:https://www.defender2.net/forum/post1024784.html#1024784 |
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5th Jan 2025 1:08pm |
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| revd Member Since: 20 Apr 2024 Location: England Posts: 151
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‘Burning’ the cabin air would result in a bit of a fug, and wouldn’t be a good idea if sleeping in a camper |
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5th Jan 2025 6:10pm |
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| julian Member Since: 17 Feb 2017 Location: Devon Posts: 131
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Unsure if this was a joke, or if you dont understand? When i light the log burner in my lounge, the air for combustion is drawn from the lounge itself. This has a minor efficiency consideration, as the air thats going up the chimney is the pre-heated air from my lounge, which is then replaced by cool air, sucked in from outside. This is called an "unbalanced" system. When my modern condensing oil fired central heating boiler fires up, the air for combustion is drawn from outside. So the air going up the flue is not the pre-warmed air from the house. This is called a "balanced" system. We live in an old stone house, built long before the age of damp proof courses etc. The lime plaster on the walls constantly releases moisture, as do all the living things in the house. If we only use the balanced central heating in cold weather, we suffer from condensation on the windows. If we use the non balanced log burner, the replacement of the air inside the house reduces the humidity. I guess some may term that "fug". Im still unsure if you were making a joke, or if you were suggesting that anyone would consider running the exhaust into the living space? You are aware people commit suicide by that method? |
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5th Jan 2025 6:38pm |
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| revd Member Since: 20 Apr 2024 Location: England Posts: 151
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I am well aware of the difference between balanced/unbalanced.
Diesel heaters draw the air for combustion from outside. Obvious because the vehicle may not have adequate ventilation to replenish the air being used for combustion. From the installation instructions for Eberspacher Airtronic Diesel Heater: "The air intake to the heater must be drawn from outside the vehicle, not from within the cabin or passenger area."" |
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5th Jan 2025 9:04pm |
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| julian Member Since: 17 Feb 2017 Location: Devon Posts: 131
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If the OP chooses to take the air from the inside, obviously they will be able to tell when they depressurise the vehical, by the hiss when they open the door... Maybe they won't be able to though, as the pressure outside will be forcing the door shut? Do you think they would be able to acclimatise to the low pressure environment, rather like those living at high altitude do? You may call me overly relaxed, but I think your concern of creating a negative pressure environment, in a defender, from your eberspacher, may well be misplaced. But, yeah, if you think you can, so be it. I assume you must have gone for genuine door seals, not britpart, and tiger sealed up the sun roof. |
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5th Jan 2025 9:41pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8099
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Reckon a defender might implode if you run it for a few hours.....
 Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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5th Jan 2025 10:51pm |
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| camelman Member Since: 27 Feb 2013 Location: Peak District Posts: 3382
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The manuals are explicit that the combustion air intake should not be drawn from the passenger cabin.
If there is an issue and the combustion gases end up leaking into the inlet into the cab, it could be fatal.  Click image to enlarge |
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5th Jan 2025 11:09pm |
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| julian Member Since: 17 Feb 2017 Location: Devon Posts: 131
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You would sleep next to a diesel heater without a CO alarm, with the confidence that the intake was routed outside?
You must have those genuine door seals, and have tigersealed up your sunroof. |
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6th Jan 2025 11:39am |
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