Webasto Thermo Top C Loom & Test Run

A look at a Webasto wiring loom and how this fits a and connects up to a Thermo Top C Webasto Diesel water heater. Also a test run of the heater prior to fitting in the coming weeks on my Tug style Narrowboat to provide hot water via a calorifier.

[@montaguemonro565]

Very helpful thanks man, i'm going to be fitting one of these myself when I move into my boat.

[@aljotock]

Awesome video thank you. you've really managed to 'de-mystify' the wiring for me. Thank goodness for people like you posting these sorts of video on KZbin 👍🏼

[@BramleyProductions]

Hi, Thanks that's most kind of you to say that glad that my little video was of some help and very kind of you to say so. Many thanks, Kev.

[@mitsubishimad4111]

​hay excellent video and well explained.... I just got one myself but have a bit of an issue getting fired up.. Pump for fule not running/clicking and i dont think the water pump is going eather. What are the other fuses in the block?

[@lioncurlew]

Excellent..Nice explanation of the wiring.. I feel more confident when I get around to getting ours running, or rather, I know the noises it makes now.

[@BramleyProductions]

Many thanks for your kind comments. Yep, these are good heaters when you get them running. Well I like mine Thanks Kev.

[@lancalotspratt]

These units are used as preheaters on the 04 Land rover Freelander TD4 1 and facelift model SE SW, they are recommended.

[@BramleyProductions]

Yep, spot on they do make good boat water heaters as well and can be picked up quite cheap but also can be problematical! But they do work well when you get them going right. Thanks, K.

[@ystein6900]

This was useful! Good to see how simple the system actually is! Do you know if this thermo top c has two power levels? Like does it run on half power when it has reached high temperature, or does it run full or off only?

[@BramleyProductions]

Many thanks. No, my Thermo Top C does not have two power levels mine just runs full until you switch it off. Now I assume you could but a temp switch in the system like a high limit so when the water reaches a certain temp the unit will /would go off. Thanks for your kind comment. Kev.

[@Dashcam_istanbul]

@@BramleyProductions All units have a high temp sensor in them and usually is around 120 degrees celcius. So they would shut off if overheated.

[@overnighter]

@@BramleyProductions that's exactly the information I was looking for, cheers

[@BramleyProductions]

@@overnighter Thanks glad you found it of some help. It's always great to get kind comments so many thanks. Kev.

[@bobthebarsteward]

These will run on red diesel, I also wonder if they'll do well on used vegetable oil

[@paulpeel5689]

Hi there Very useful video, Big thanks Where did you purchase your loom ,there seem to be 3 variants, controller, 7 day controller and multiple controller looms I'm alittle confused ,also the amazon £9 controller suites my needs too .

[@BramleyProductions]

Hi, thanks for your kind comment My loom came from ebay and a super firm called Angliapostalparts it seems they are no longer trading on ebay sadly! As they advised and sent me the right loom with the right connectors on for my Thermo Top C. So it was as simple as that for me. That cheap 12volt timer from Amazon works well. Could heaters when you get them working well for sure. thanks again Kev.

[@paulpeel5689]

@@BramleyProductions Thanks again Kev ,I'm looking forward to hear her roar up ,your video and comments have been invaluable .warm regards Paul

[@johnhart6036]

thanks for the response also seems my one didnt come with a pump also

[@BramleyProductions]

I think I paid about £40 for a pump from a UK ebay supplier again but I now see there are some very cheap pumps sold for these type heater on ebay from Hong Kong and China mind I suppose delivery would take a few weeks! I put my heater and parts altogether from buying all the parts it was cheaper than buying one of the very expensive Webasto Kits. Kev.

[@aljotock]

Quick question please. I want to replace my now defunct Mikuni MX60 heater with a Webasto heater. However, the Mikuni is 24v (has a 24v supply already laid on) and it looks like all the Webasto's run on 12v. How can I get around this please?

[@BramleyProductions]

Hi, I think you can buy the Webasto in a 24 Volt version. I'm not 100% sure on that but I'm sure I have read that mind that was some time ago when I read that. Now in converting a 12-volt unit Webasto to run on a 24 Volt supply! I would have to consult my friend who knows a lot more about these heaters than I do. I have always only ever fitted 12-volt versions of this Webasto heater. Also, the Eberspacher D2 warm air heaters these have all been 12 volts. I will drop him an email to see if he knows if you can do this, I would assume there would be some way around this for sure. Thanks. Kev.

[@koningbolo4700]

Hi it has been a while but I was wondering how you did with the narrowboat install of the webasto and calorifier please?

[@BramleyProductions]

Hi thanks well its funny today I got the last job done on the list now all I have to do is install the Webasto! So I hope to start this next week work has been a bit delayed as I care for and elderly parent so my time as been somewhat limited this summer but the installation is coming and I will try to video some of it and how it all works out and goes together so yep its coming soon! Thanks for asking and hopefully all being well next week I'm going to start at last the rewire and re plumb all took a lot longer!!! I have the calorifier all fitted and this works well off the shore power 240v electric with the 1kw immersion heater that is fitted to this as well so I do have hot water at the boat again which is lovely Thanks Kev.

[@tanyano9]

Like you Im using this in my narrowboat and will be doing away with the relay, so what do i do with the two thinner wires going to the relay..?

[@BramleyProductions]

I just put some heat shrink tube over them and taped than back into the loom and left them! Kev.

[@fibranijevidra]

The loom is pretty expensive for what it is, especially as you are not using all of it. I wonder what type of connectors sre those. Better to make own loom with what one needs anf propet wire length. Thanks for the video.

[@BramleyProductions]

Many thanks Yep I agree to re the loom price! Mind it was a bit like a catch 22 situation not knowing what wires went where buying the loom made this much easier and now I know I could soon make a loom much cheaper for sure but this was a genuine Webasto part so you do pay the price then Thanks for your comment Kev.

[@gerryr1893]

kzbin.info/www/bejne/q3fNh2l8iLlrftk

[@gerryr1893]

I make the looms check my video

[@geoffreysmith916]

Hi. Thank you. Very useful video about the loom upon which, as you say, there's very little on the interweb. On my Top C loom there are two relay-like objects in the bank with the fuses. One is obviously a standard type of auto relay and which I understand, however, beside it, there is another relay-like object which also plugs into a relay socket but this one is much taller than the standard auto relay. There is not a single marking on this thing anywhere and its 'pins' are very sulphated which maybe behind why my unit does not now function. Do you or does anyone know what on earth this thing is? I am expecting to have to disassemble the loom with a meter in hand to determin the disposition is of everything but if you can save me any spaghetti teasing, I will be so grateful. Again, thank you for the video.

[@BramleyProductions]

Hi, that is a tricky one for sure! I have to say I'm just very much a DIY amateur with these heaters I have never seen a set up like you say you have on yours normally you just get the relay and fuses the relay I have not used as that is there if the heater is used on a vehicle and so powers or goes to the vehicle fan. So sorry I'm not much help there is a wiring diagram here see the link and that gives no notes on any other parts either so sorry I have not been much help! Kev. www.melloronline.co.uk/product_uploads/14417990441.pdf

[@geoffreysmith916]

@@BramleyProductions Well, I finally got at the Webasto loom and have opened out as much as I can reach (Lol. 6' 3" tall and round!). The 'extra' relay is indeed a timer relay. Professor Google says it can be set from 0 to 150 minutes, is Polish and gave me a '.pdf' which had an English translation!! When removed and viewed very close up, I could just make out embossed terminals 1 to 5. I also found a faded old label in the 'hidden' side and by chasing the wiring back, I found it switched both the heater itself and the water pump on using the black 'signal' wire on the loom as the trigger. I stripped out the relays and the unused bit of loom for relay switched vehicle HVAC equipment. Unfortunately, my meter testing found that the timer is defective but by bypassing it, I got the heater to power up second go after a lockout reset. Much happier now but must withdraw and await replacement parts. Geoff Smith.

[@BramleyProductions]

@@geoffreysmith916 O well done glad you are well on the way to fixing your problem there. It's always so very interesting to read of these faults and there fixes thanks Kev.

[@geoffreysmith916]

@@BramleyProductions I have now determined that this loom is unlike yours in that the cabling for the water pump is routed to the fuse block to attach to the 'former' timeing relay. I cannot get to enough of the loom to take that lead back closer to the pump and burner unit so I will re-instate the conventional relay and use the trigger wire with a relay socket connector 'T'ed into the cable to energise a coil switching in the water pump from a power lead from an unused fuse holder. I found the yellow diagnostic wire which was terminated on one side of yet another unused fuse holder. Going to look a whole lot leaner by the time I have finished, IMHO. Best wishes. Geoff.

[@montaguemonro565]

You said you were having some issues with air in the heater, if you install this into the boat, how do you ensure there wont be air in the circut?

[@BramleyProductions]

Hi Many thanks for your kind comments, Yes I have heard others have this air problem re the Webasto pump what I have seen done is on where you connect up the flow side of the water heater hose on the Webasto is to put a small length of heater hose then in 19 mm copper fit one of those auto air bleeders have a look at the pictures here to see what I mean. www.canalworld.net/forums/index.php?/topic/87746-webasto-thermo-top-c-stopped-working/ I'm not sure I'm going to do this as remember you will need a header tank somewhere higher than the heater to fill the system and keep it topped up and also my small radiator does have an air bleed vent as well and I'm going to try to run the heater hose slightly down or level thereabouts from the Webasto unit to the calorifier but if I still have air issues re the Webasto pump! Well then I may put a vent like in the pictures re-link above I think its very much trial and see! Hope that maybe help Kev.

[@montaguemonro565]

@@BramleyProductions I think i see what you're talking about, assuming that the air will rise into that copper part above the pipe as the water goes through, and then you can turn the nozzle to let it escape?

[@BramleyProductions]

Yep, you have got it! Sometimes here in the UK, those auto bleed valves are used on central heating systems they do work automatically letting any air that rises to that point out! I have no idea how well they would work on a Webasto system mind but if air was a problem it would be worth fitting one they are not that expensive Kev. www.screwfix.com/p/bottle-air-vent-15mm/34359?tc=DB8&ds_kid=92700020952478947&ds_rl=1241687&ds_rl=1245250&ds_rl=1249404&ds_rl=1249799&ds_rl=1245250&ds_rl=1249481&gclid=CjwKCAiAs8XiBRAGEiwAFyQ-em3KaI4IDFnsQeXkehRQ8LSdzysemk6FSVrfkwFZpzlNXEaLWvNCERoC0d4QAvD_BwE&gclsrc=aw.ds

[@montaguemonro565]

@@BramleyProductions Mate, you're an absolute legend, definitely subscribing!

[@BramleyProductions]

Thanks, Yes please do come back an see how this Webasto all fits on my small narrowboat and if I can help in any way re my own limited knowledge on this type of Webasto just ask will always try to help re -any questions Tanks again Kev.

[@yusufucan7711]

hello, good work. I enjoy watching your videos. Thank you very much for your sharing. I have a thermo top c webastom, I want to run it externally. I don't know the wiring diagram, help please. thanks

[@BramleyProductions]

Thanks for your kind comments! Well, this is a bit tricky as you will see I brought a Webasto Thermo Top C complete wiring Loom off ebay for my heater! You really need a wiring loom that is made for the heater then it is very straight forward to concert all the parts up as I show here. As those loom fits the plugs on the Thermo Top heater and has a connection for the pump etc, I would recommend trying to find a loom for your heater. Sorry, I do not have any wiring diagrams for the Webasto heater! And like I say I brought the loom and it all fitted together very easily. Kev.

[@yusufucan7711]

@@BramleyProductions thanks

[@yusufucan7711]

@@BramleyProductions thank you for your attention.

[@user-vn1pq7wq4k]

Please explain to us the electrical wiring in detail. Thank you very much

[@tonygreaves6503]

Do the logs come in the webasto kit ??

[@BramleyProductions]

Nice one! No, they come from the ancient Rockingham Forest! Long before these Webasto were ever thought about a medieval wood so big Weldon Church In Northants has a glass lantern on top of the tower to guide lost travels in this great wood! Great comment! Mind from what some people tell me when these things break you might be better burning wood to heat the water LOL!!! Kev.

[@numheed]

Hi, at 5.23 you show the wiring plugs to the heater, first plug has 6 ports with three wires, no 1 for timer, no 6 for the pump, what is no 2 for? second plug has 2 ports which are + and - 12v supply. Cheers P

[@BramleyProductions]

Hi thanks the heater is now on the Narrowboat in the process of being fitted so I don not have the heater or any paper work here at home right now the loom that I fitted to this Webasto was brought from a reliable suppler of Webasto parts off ebay like I say my plugs from the loom to the top of the heater just fitted on to the heater I could have a look next time I go at what No 2 does but like I say I do not have the heater here at home right now so sorry about that Kev.

[@BramleyProductions]

Just had another think as I say ticky with out my heater to see here but this loom and plugs also came with a brown and black wire which is if you are using this in a vehicle as a heater! I think this connects to the fan in the vehicle to control this and via the relay which I remove in this video as for the boat hot water system this is not needed. But like I say when I next go to the boat I can check this out. Kev.

[@numheed]

@@BramleyProductions cheers

[@BramleyProductions]

At last I have been to the boat so if this helps! So re the second plug on Webasto heater on my loom is like this 1. Is Blank Not used. 2. Is Yellow cable. 3. Is Purple cable. 4. Is Black Cable. 5. Is Blank Not used. 6. Is Red Cable. Now The Yellow cable is not used on my system but this yellow cable of NO.2 position can be used with one of those diagnostic programmers I believe. The Purple of NO3 goes to my timer controller and I assume the red of 6 and balck of 4. are power. Hoppe that may help in any way. Kev.

[@gerryr1893]

I make looms up

[@martinnorthfield9358]

Have you got a link for the loom and controller please

[@BramleyProductions]

Sorry, this video was now made a number of years ago the firm where I brought both items from has long since stopped selling on ebay from where I brought them from! And I don't think sadly is still even in business selling Webasto parts. A search on ebay for Webasto Therm Top C looms might be a way forward sorry about that. Kev.

[@johnhart6036]

Was that new as I cant find any that price found £10 12v pump says for webasto on ebay

[@BramleyProductions]

There again My was brought 3 or 4 years ago so like all these things they have gone up but I have likewise seen when I just looked these cheap far eastern pumps on ebay I have no idea if they are any good but they seem cheap enough to try one I know you can buy a China-made diesel warm air blown heater for all in a kit for under £100 on ebay these days and I have heard people say they are OK so maybe these cheap pumps would be fine maybe worth a try at that price. Kev

[@sahaautos3503]

hello,do i need w bus to run the unit ?i need wirring diagram how can i find? thank yo

[@BramleyProductions]

Sorry for the delay in getting back to you I have not been too well this last month. Sorry I would have no idea at all where to find a wiring diagram! I figured mine out myself more by luck than judgment I feel they are quite easy to sort out. Kev.

[@johnhart6036]

can you put a link to the timer please and how you made up the wiring loom

[@BramleyProductions]

Hi, the loom on my Webasto was brought as a Webasto Thermo Top C loom from ebay from a UK supplier of Webasto parts it cost me about £50 for this. It was much easier than trying to work out and make my own loom. I suppose you could but for me, this was much quicker and so much easier. the timmer comes from the link below Hope that might help thanks for comment Kev. www.amazon.co.uk/Heschen-Digital-Weekly-Programmable-Switch/dp/B071D9H3JY/ref=sr_1_3?crid=2YXER7DHQ0BF6&dchild=1&keywords=12+volt+timer+switch&qid=1587501903&sprefix=12+volt+timer%2Caps%2C164&sr=8-3

[@BramleyProductions]

Looks like the Webasto looms have gone up since I brought mine on ebay They now seem to range from £70 to £90 pound now! Kev.

[@elvigno1969]

Which wires the fuel pump connects to ... can you tell me ... please

[@BramleyProductions]

On my loom which was sold to me as a proper Webasto loom for the Thermo Top C the fuel pumps connects to the thinner red & blue cable The Thicker Red And Blue cables are the main power cables to hook up the heater to your main 12-volt battery. often I have seen both Webastos and Eberspacher heaters also use green and brown wires for the fuel pump hook up. Kev.

[@manbehindthewheel249]

Hi sir may i know how much fuel this heater consume in one hour. I am looking forward to make a diy heater for my garage. I really appreciate if you can reply me back please

[@BramleyProductions]

Hi, What would you like to know about this heater? And sure if I can I will always try to help. Thanks for the comment. Kev.

[@manbehindthewheel249]

@@BramleyProductions sir i want know how much deisel this heater consume per hour.

[@BramleyProductions]

According to the manufacturers they use .6 of a litre on high and .3 litre on a low setting. I have known people on boats say they use about just under 1 litre an hour heating water via a calorifier. Hope that helps. I sure it will depend on how much water you are trying to heat up in your system and such like. Kev.

[@BramleyProductions]

According to the manufacturers they use .6 of a litre on high and .3 litre on a low setting. I have known people on boats say they use about just under 1 litre an hour heating water via a calorifier. Hope that helps. I sure it will depend on how much water you are trying to heat up in your system and such like. Kev.@@manbehindthewheel249

[@manbehindthewheel249]

@@BramleyProductions thank you very much sir yes it is very helpful.

[@mattsandilands6380]

It’s very noisy.

[@BramleyProductions]

Hi Yes, noise can be a problem with these units on startup, particularly you can hear them on boats a fair way off! I suppose on car and vans it does not matter too much but on a quiet tranquil canal or river bank it can sound very noisy But in their defence they do work well and heat the water up quickly but you raise a valid point with the noise! Kev.