question on webasto rh100

Jan 8, 2014
958
2,193
Emsworth
Funster No
29,620
MH
Bailey 740
Exp
2013
hi all , just some advice really, I have a webasto water and warm air heater which is being serviced. I have 2 x 95 amp varta batteries (auxillary) does anybody have problems running it of batteries alone?
 

scotjimland

Free Member
Jul 25, 2007
32,020
29,504
.
Funster No
15
MH
.
Exp
.
With 2 x 95ah you have 95ah useful power before you effectively flatten the batteries. ( 50% of the capacity)

check the label of your heater , what amps does it use.. that will determine how long the batteries will last..

for example , if it says 2 amps, you will have about 50 hrs , that's not including other uses such as lighting, water pump etc.. so allowing for them maybe 30 - 40 hours.. to be on the safe side let's say 24hours .

but as I said.. check your heater label.. then decide if that is a problem..
 
OP
Daz n Tina
Jan 8, 2014
958
2,193
Emsworth
Funster No
29,620
MH
Bailey 740
Exp
2013
thank you for your reply jim, my question was really aimed at funsters who have one but I will check the amps as this is useful information. I have had problems with mine starting up numerous flashes warning of low power when I know the batteries are fully charged. I.e new batteries and been on hook up for a couple of days. And also numerous warning flashes to say fan problems etc
 
Feb 9, 2008
5,270
6,477
Corby, Northants
Funster No
1,455
MH
Coach Built
Exp
Since 2007
I have one ! Whilst the unit user a few amps to (about 4-5 ) to heat the glow plug on start up, It's pretty much self sustaining after that.
If your getting numerous flashes with fully charged batteries you have a problem and need to decipher the flashing code which is in the user manual.
I would advise calling Webasto and they will confirm how much drain is taken from the battery on start up and may advise on the flashing you are witnessing.

I've had mine now for 3.1/2 years , have never had it serviced and it's quiet as a kitten and a superb bit of kit. I run in for a minimum of 1 hour per month to keep everything in good working order.

I have never had a problem with running from the batteries alone, which I do quite often.
 

scotjimland

Free Member
Jul 25, 2007
32,020
29,504
.
Funster No
15
MH
.
Exp
.
I have one ! Whilst the unit user a few amps to (about 4-5 ) to heat the glow plug on start up, It's pretty much self sustaining after that.
If your getting numerous flashes with fully charged batteries you have a problem and need to decipher the flashing code which is in the user manual.
I would advise calling Webasto and they will confirm how much drain is taken from the battery on start up and may advise on the flashing you are witnessing.

I've had mine now for 3.1/2 years , have never had it serviced and it's quiet as a kitten and a superb bit of kit. I run in for a minimum of 1 hour per month to keep everything in good working order.

I have never had a problem with running from the batteries alone, which I do quite often.
I thought the OP's model had a blown air fan .. that uses about 2 amps..

I have a webasto water and warm air heater
my mistake..
 

Allegro83

Free Member
Jul 20, 2010
67
43
Balfron, Stirling
Funster No
12,725
MH
East Neuk Fifer L
Exp
15 years
We had the Webasto Dualtop in our previous Motorhome and had no problem running heating/hot water when not on hook up. We had 2x110 ah batteries and 2x 80 solar panels.
If an error code is flashing up the book is very good. Only problem we had was sticking dump valve which was replaced under warranty. Oh and a 10 amp fuse went, they have to be taken out in a certain order and replaced in specific order again the instructions help.
 
OP
Daz n Tina
Jan 8, 2014
958
2,193
Emsworth
Funster No
29,620
MH
Bailey 740
Exp
2013
thank you all for the info. It is with the motorhome workshop at the moment to be sorted, it was just that prior to our new van I had a self build with a propex heater and I could park up for at least 4 days and everything was fine working of one 110 amp battery but the Malaga water heater was gas. We rarely use ehu and I am hoping the new van will be the same. By going by your comments I should not have a problem.
 

scotjimland

Free Member
Jul 25, 2007
32,020
29,504
.
Funster No
15
MH
.
Exp
.
Last edited:

jonandshell

Free Member
Dec 12, 2010
5,485
8,326
Norfolk
Funster No
14,648
MH
Not got one!
Exp
Since 2006
As long as your batteries are in good nick, it'll be fine.

Ours will run for 4 days at -5 to -20 degrees outside whilst maintaining 20 degrees inside the van.

Our battery bank is 345 Ah.
 

jonandshell

Free Member
Dec 12, 2010
5,485
8,326
Norfolk
Funster No
14,648
MH
Not got one!
Exp
Since 2006

jonandshell

Free Member
Dec 12, 2010
5,485
8,326
Norfolk
Funster No
14,648
MH
Not got one!
Exp
Since 2006
you're welcome..

back to your amps.. just be aware, according to the manual, it uses 7 amps blowing hot air.. seems a lot .. but that's what it says.
Hi Jim

That is an absolute peak current in my experience. The glowplug is the culprit there.
I reckon in normal UK winter use, an average of 2 amps is good for battery endurance guesstimation.
 

scotjimland

Free Member
Jul 25, 2007
32,020
29,504
.
Funster No
15
MH
.
Exp
.
Hi Jim

That is an absolute peak current in my experience. The glowplug is the culprit there.
I reckon in normal UK winter use, an average of 2 amps is good for battery endurance guesstimation.
thanks.. so my first guess was close to the mark.. cheers
 

jonandshell

Free Member
Dec 12, 2010
5,485
8,326
Norfolk
Funster No
14,648
MH
Not got one!
Exp
Since 2006
thanks.. so my first guess was close to the mark.. cheers
Our average draw during a ski trip for all our 12 volt system is about 4 amps.
The dualtop is quite advanced compared to earlier diesel heaters in that it ticks over using very low quantities of current and fuel rather than continually shutting down and restarting.
The restart is what places the highest demand on the battery due to the glowplug being powered up.
The fuel dosing pump, burner fan and circulation fan use very little current during continual use.
 

Ed Excel

Free Member
Nov 27, 2012
870
578
Ribble Valley
Funster No
23,815
MH
Coach built
Exp
Started 2007
Why don't you turn the Webasto on when you start your journey? It's diesel you can run it whilst on the move. It's a central heating system. Ours goes on before we turn a wheel and off when we get home.
 
OP
Daz n Tina
Jan 8, 2014
958
2,193
Emsworth
Funster No
29,620
MH
Bailey 740
Exp
2013
when travelling which settings do you have it on? Mine has water 40 and 70 deg and winter mode heating or heating and water. Or can you have it on any setting?
 

Ed Excel

Free Member
Nov 27, 2012
870
578
Ribble Valley
Funster No
23,815
MH
Coach built
Exp
Started 2007
Summer: hot water.
Winter: heating & hot water.
We use the water 40C setting for the sink and the 70C for showers. So it's usually on 40 until we want a shower.
 
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