heating elements

D

doug harding

Joined
May 8, 2022
Posts
55
Likes collected
21
Location
Canterbury, UK
Funster No
88,558
MH
carthago 143 le
Exp
15 years
we have a carthago 143le. on the equipment list it states two 900 watt elements on combi6. as extra. wondering about the logic of two 900's and one 1800watt. any explanation?
 
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Probably you have the option of only using one element, e,g, for use on sites that only have a low EHU limit. Should be a "low" setting on your control panel.
1800w = 7.5 amps, 900w = 3.75 amps at 240v. Quite a few sites limit you to 6amps so using the higher setting would trip the EHU.
 
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It's the way Truma Combi's are made nothing to do with Carthago.
We have a Compactline on order I didn't bother with the electric option, cheaper to run on gas.
 
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thanks for reply. can't find anything on panel. when on 900 watts the heating is really low, hence my query. most sites we use will be 16amp. the two elements are listed on the spec sheet. never come across this before. will investigate further if the weather allows!
 
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Which control panel do you have?

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no name on panel. just lights. the boiler control is truma plus. on a 143le 2020. assuming i have the correct books.
 
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The option is normally in the fuel choice on the rotary controller.Thus, Elec1 =900w. Elec2 =1800w.
You then have further options, Elec.+Gas, 1, or 1+2. All Gas[ quite often best in Europe]. All Electric, [ can be used in the UK with 13A hook up, but if metered, ]. 🤷‍♂️
Mike.
 
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am aware of options on control. just confused about heating elements. seems to be same as all other ones we've had. but the bookwork states this vehicle has an extra 900 watt element. would seem strange as the elements normally fitted are one 900 and one 1800watts. whatever the outcome it cost the original owner £515! thanks for replies. ......Doug.
 
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The combi boilers have two elements. When on 18oow setting both elements are on in parallel. When on 900w setting both elements are on in series. Unusual way to utilise twin elements, but it does mean better heat distribution from more element surface area.
As far as I know all Truma combi boilers are like that.
Official price for a pair is about £380, so £515 is not too bad for the whole job, some of those boilers are pigs to get out.

Geoff

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donkey said:
The combi boilers have two elements. When on 18oow setting both elements are on in parallel. When on 900w setting both elements are on in series. Unusual way to utilise twin elements, but it does mean better heat distribution from more element surface area.
As far as I know all Truma combi boilers are like that.
Official price for a pair is about £380, so £515 is not too bad for the whole job, some of those boilers are pigs to get out.

Geoff
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i'm sure you are right. still begs the question as to why this was charged extra from new. thanks for your input.
 
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doug harding said:
i'm sure you are right. still begs the question as to why this was charged extra from new.
Click to expand...
On the Carthago Compactline & C Tourer it is on the options list but they won't supply RHD without and they charge you for it as an option, they do the same with 16" wheels on the light chassis.
I ordered LHD so I had the option of not having it as I can't see it is worth £550 when we hardly ever use sites and its cheaper to run the heating on gas.
 
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had i bought ours new neither would i. but its on the extras list along with a page full of other " must have" tackle!
 
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Maybe the optional extra was for the 6e rather than the 4e. The 6 has a higher output on gas but same on Electric.

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Just taken our 6e apart to replace heating elements. There isn't provision on the main alloy core for more than the two 900w elements. It would be interesting to see the blurb because I doubt they'd make a special one just for Carthago.

But every day is a potential school day.
 
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daveclare said:
Just taken our 6e apart to replace heating elements. There isn't provision on the main alloy core for more than the two 900w elements. It would be interesting to see the blurb because I doubt they'd make a special one just for Carthago.

But every day is a potential school day.
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hi
When replacing elements please be careful when removing old units. If they are blown, do not try forcing them through the alloy casing, it will enlarge the holes , which will effect the heat transfer.
If they are blown it is better to cut the old elements into sections, so that they slide through the casing holes.

Geoff
 
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Thanks for the advice but already done. I got the complete new genuine alloy inner with the elements already factory crimped in place, for less than the cost of genuine elements alone.

Got to say German manufacturing and assembly quality is rubbish, especially where Truma is concerned. Make me thing twice about buying a German motorhome::bigsmile:
 
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doug harding said:
am aware of options on control. just confused about heating elements. seems to be same as all other ones we've had. but the bookwork states this vehicle has an extra 900 watt element. would seem strange as the elements normally fitted are one 900 and one 1800watts. whatever the outcome it cost the original owner £515! thanks for replies. ......Doug.
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No, the option is no elements or 2x900W elements. There is no 1800W element. The e after the 6 or the 4 denotes that it has 2x900W elements which equals 1800W when both are used.
Edit p.s. Great choice of motorhome.

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Last edited:
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donkey said:
hi
When replacing elements please be careful when removing old units. If they are blown, do not try forcing them through the alloy casing, it will enlarge the holes , which will effect the heat transfer.
If they are blown it is better to cut the old elements into sections, so that they slide through the casing holes.

Geoff
Click to expand...
Head down, brute force and go for it was my style :ROFLMAO:


element.jpg
 
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