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jonny



Member Since: 10 Mar 2013
Location: North Wilts
Posts: 182

Webasto Airtop - Installation Options
Hi All

I've just purchased a Webasto Airtop to go in my TD5 (courtesy of Racedriver on here), so next stop is to look at fitment options...

It looks like the usual place to fit them is under the cubby, and Mudstuff and Nakatanenga make boxes specifically for this:

https://www.mudstuff.co.uk/products/mud-he...&_ss=r

https://www.4x4overlander.com/product/naka...console-2/

The mudstuff one is cheaper, but the Nak one appears to be better thought out, with mounts for vents etc. Other than DIY, are there any other options?

Another question - both of those lockers mount the heater with the air inlet at the front, heat output at the rear. Am I missing something - could the webasto be flipped round to blow towards the front, as I'd predominantly want it to heat towards the front seats?

Cheers

Jon
Post #1061312 25th Feb 2025 11:21am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5920

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
My heater is fitted under the rear seats in my 110. Warm air blows out in the middle from under the rear seats from a swivel vent.
Works well but downside is, not a lot of heat around your feet in the front.
Exhaust is in the wheel arch on the passenger side and fuel tank and pump live under the bonnet.
Mine is an Eberspacher D2 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1061313 25th Feb 2025 11:24am
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GeorgeE



Member Since: 10 Feb 2025
Location: Wanborough
Posts: 15

United Kingdom 1991 Defender 110 200 Tdi CSW Venetian Red
"My heater is fitted under the rear seats in my 110. "

Do you have any pictures of this? I have a spare Eberspacher and a 110 station waggon - I'm keen to have the two of them make friends. I've heard of people putting them under the back seats and that seems a good idea but I couldn't work out how to do it and route the exhaust.
Post #1061316 25th Feb 2025 11:41am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5920

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Not to hand.

The heater sits under the rear seats - air intake points towards the door and the heat outlet points to the other drivers side rear door.
Metal foil pipe curves away from the heater and exits under the rear seats.

The exhaust and combustion pipe works exits through the floor (does mean drilling the floor)

The combustion intake with filter sits on the chassis rail and the exhaust comes out under the wheel arch. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1061318 25th Feb 2025 12:02pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5920

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I lied. Found this on the forum
https://www.defender2.net/forum/topic90392.html?highlight=heater 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1061319 25th Feb 2025 12:03pm
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GeorgeE



Member Since: 10 Feb 2025
Location: Wanborough
Posts: 15

United Kingdom 1991 Defender 110 200 Tdi CSW Venetian Red
Fantastic, thanks Smile Guessing from the antenna connectors you may also be Raynet.....

Sorry, more questions... Where did you get the under bonnet fuel tank from and roughly how long does it last?
Post #1061322 25th Feb 2025 12:59pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5920

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Not Raynet, but amateur radio / rally radios connections.

Fuel tank was Ebay and easily lasts while. I have used for a few hours at a time on car rallies etc I would easily expect a full weekend. Its around 5 litres. The fuel pump is located just below the tank, on the inner wing, so its kinda gravity fed into the filter and then the pump 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1061333 25th Feb 2025 3:02pm
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GeorgeE



Member Since: 10 Feb 2025
Location: Wanborough
Posts: 15

United Kingdom 1991 Defender 110 200 Tdi CSW Venetian Red
Thanks - given me a good head start on doing this Thumbs Up
Post #1061337 25th Feb 2025 3:30pm
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5920

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
Whether or not its the best way, not sure, but it works for me 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #1061341 25th Feb 2025 3:49pm
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34064



Member Since: 12 Dec 2023
Location: South Central
Posts: 225

United Kingdom 2003 Defender 110 Td5 HT Alaska White
I have just finished my installation of my Webasto Airtop 2000s that came with my 110 from the factory as originally it was mounted in the rear tub by the bulkhead but i have removed it and put it in a mud stuff box under the cubby. i have it facing with the heat out the back as mine will be used while camping and i have made a duct and box that goes behind the cubby with a 360 degree rotating vent after 3 minutes of it being on its absolutely roasting in the cab so i only have it on for a few minutes then turn the burner off and just use the fan to blow whats left in the heat exchanger out which gives me another 20 minutes of heat. You could rotate it around to warm the front up it would also be easier keeping the fuel in away from the exhaust. 110 Td5 Ex Utilities slowly converting into a pop top camper one day

Build thread:https://www.defender2.net/forum/post1024784.html#1024784
Post #1061342 25th Feb 2025 3:51pm
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revd



Member Since: 20 Apr 2024
Location: England
Posts: 216

United Kingdom 
Eberspacher between the seats with Mudstuff box under the cubby - fuel pick up using a collar from Butler Technik, heater control in the cubby means no wires under the tunnel or holes in the dash. Heater blows out through the bulkhead but soon warms footwells.


Click image to enlarge
Post #1061345 25th Feb 2025 4:16pm
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GeorgeE



Member Since: 10 Feb 2025
Location: Wanborough
Posts: 15

United Kingdom 1991 Defender 110 200 Tdi CSW Venetian Red
excossack wrote:
Whether or not its the best way, not sure, but it works for me


I like the idea of the separate fuel tank, I don't want to cut into the fuel line (having in the past spent hours tracking down where air was getting into a diesel line my view is the fewer opportunities for that to happen the better). I like the filler neck option but I have the extra range fuel tank so can't do that. I did see the other option of putting a pot in the diesel return line which I liked and may well look into.

The heater under the cubby box would be fine other than the fact at the moment the padded top is exactly the right height to act as an armrest so don't really want to change that, under the back seats is out of the way enough and sufficiently covered in that it is protected from stuff being lobbed in the back footwell.
Post #1061348 25th Feb 2025 4:30pm
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bodstruck



Member Since: 09 May 2020
Location: Wiltshire
Posts: 972

United Kingdom 
You can replace the main outlet on the heater with a 4 way one. There is enough room (just) in the heater boxes to run 42mm flexible hose to both the front and rear of the box so you can have outlets both sides.

I don't have pics to hand but the outlet is like this one: https://www.ebay.co.uk/itm/375861735071?mk...media=COPY

and the vents: https://www.ebay.co.uk/itm/186517468966?mk...media=COPY

I have gathered all the parts but yet to fit. Fuel tank will be under the bonnet, heater and vent pipework in a mudstuff under cubby box with 2 swivel outlet vents both front and back. Combustion air inlet will be routed as high as I can get it under the bonnet and the exhaust will exit to one side with a silicone cap on the end to keep water out if wading (to be removed when is use Smile )
Post #1061351 25th Feb 2025 4:48pm
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jonny



Member Since: 10 Mar 2013
Location: North Wilts
Posts: 182

Thanks - good feedback... Are you planning on putting extra holes in the mudstuff locker for the additional vents? It seems that the Nak' locker is considerably more expensive and is going to be special order, so maybe the mud one is going to be quicker/easier if it's easy enough to add the extra vents in...

Any thoughts on why both of them blow air to the rear - is it because most people want to heat the back for camping etc, rather than any kind of technical requirement?
Post #1061364 25th Feb 2025 6:52pm
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barbel jim



Member Since: 12 Dec 2012
Location: Northants
Posts: 1435

United Kingdom 2005 Defender 90 Td5 HT Tonga Green
I used the mud stuff locker,

Click image to enlarge

But swung the heater 180 degrees so it blows out the front. Fundamentally because I can’t stand cold feet Laughing (not because my amps are in the way Whistle )I rotated the locker 180 degrees also to utilise the vent hole. The only real issue was mounting the cubby as I couldn’t use the predrilled lid holes , but drilling a new set wasn’t an issue. The single outlet works a treat, and blows across to the heater outlet, which I leave on low, and hey presto lovely toasty tootsies Mr. Green it can be rotated up to the screen, or passenger side, if you want any more info just ask

Click image to enlarge



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Click image to enlarge
Post #1061369 25th Feb 2025 7:44pm
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