Diesel heater location

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ralph
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Diesel heater location

Postby ralph » Fri Nov 09, 2018 5:33 am

I am now thinking about the systems I need to fit and where to locate things. For the heating and hot water I intend to plumb a webasto C top into the engine cooling circuit and fit a 20l calorifier, a couple of fan heater matrixs and a towel rail.
I have been planning to fit the Webasto under the body, which i assume is the norm? but I now have space to fit it inside and I was wondering which would be better...has any body got any experience?

Ivan C
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Re: Diesel heater location

Postby Ivan C » Fri Nov 09, 2018 8:10 am

Ralph,
I'm at the same point and the general consensus I'm getting is that the hydronic heaters are meant to live ouside, whereas the airtronic ones live in the cabin with exhaust and inlet through the floor.
If you look at the oem fitments most hydronic units are auxiliary heaters and live below the bonnet, where air ones use a floor plate.
That's only my opinion, not gospel :D
Ivan C

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Avid64
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Re: Diesel heater location

Postby Avid64 » Fri Nov 09, 2018 1:58 pm

Ivan is correct, the usual location is in the engine bay/outside of the vehicle.
However, I have installed my Webasto C-Top in the rear of my garage - I'm only using it to supply a heater matrix and a plate heat exchanger for hot water.
I managed to get everything in a very small footprint - the complete system has only 1m of pipework so heat up times should be minimal and everything is in a bunded area in case of leaks.
Dave
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Big Monkey
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Re: Diesel heater location

Postby Big Monkey » Fri Nov 09, 2018 2:39 pm

Hi Ralph,

We were going to use a calorifier or immersion heater until recently. We are now going to use a hydronic unit and a plate type heat exchanger. This should give us a lot of hot water if things are sized right. We will possibly also use it to provide under floor heating. The heat exchanger, header tank and hydronic unit don't take up much space. I have one here if you want to look at it.

We will use a blown air heater for the main bulk of the heating and divert it into the bathroom for drying wet gear.

Ivan C
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Re: Diesel heater location

Postby Ivan C » Fri Nov 09, 2018 4:57 pm

Big Monkey wrote:Hi Ralph,

We were going to use a calorifier or immersion heater until recently. We are now going to use a hydronic unit and a plate type heat exchanger. This should give us a lot of hot water if things are sized right. We will possibly also use it to provide under floor heating. The heat exchanger, header tank and hydronic unit don't take up much space. I have one here if you want to look at it.

We will use a blown air heater for the main bulk of the heating and divert it into the bathroom for drying wet gear.

Without a calorifier where are you going to store the domestic hot water?
I can see how it could be used for underfloor heating though
Ivan C

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Re: Diesel heater location

Postby Big Monkey » Fri Nov 09, 2018 5:49 pm

Hi Ivan,

I'm just going to rely on the fact that if I need a shower, will wait 10 minutes for the system to get the header tank fluid to temperature. The header tank will be insulated, so it should retain much of the heat. Washing up in cold water is no big deal.

The package is more space efficient as the hydronic unit will sit within the chassis. The header tank will be in an outside, but insulated locker. That's the idea at least.

Does this sound like a sensible plan?

Ivan C
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Re: Diesel heater location

Postby Ivan C » Fri Nov 09, 2018 6:05 pm

Ah, so you're using the header tank as both header and storage or calorifier.
Personally I will have a calorifier as well as it will mean hot water on tap if we have been driving inside the last 24 hours.
We have a Truma combi in the van, capacity less than 10l, and because we are using a blend of hot and cold water find this is plenty for 2 (short) showers in a row.
A 10-20l calorifier doesn't take up an enourmous amount of room, our's will go in the "dead"space at the bottom of the wardrobe. Any heat loss, along with the rear of the fridge venting in to the wardrobe will make it like a little airing cupboard.
That's my logic, and it seems an almost standard layout so must have something to reccomend it :D
I do prefer the idea of a heat exchanger, rather than running engine coolant pipes into the hab. space, though it means an electric pump.
Ivan C

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sparks101
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Re: Diesel heater location

Postby sparks101 » Fri Nov 09, 2018 6:56 pm

I have a 40 l calorifier that runs off the eberspacher and has the coolant pipes/heat exchange running through it. Means that I have 40 l of hot water as soon as we stop. That will overnight with a couple of showers in AM.
Also runs off the 240v hookup if required.

In my humble opinion, if you can get a calorifier in, I would.

My heater is in an outside storage locker, safe from the elements but away from the hab box. It does make a row when it starts up, like a jet engine :D

good luck

Andy

ralph
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Re: Diesel heater location

Postby ralph » Sat Nov 10, 2018 5:28 am

I think I will go with the original idea of putting it in its own locker under the chassis some where. At least that way it cant leak fuel or fumes into the habitation box. i am going to buy a 20l surecal calorifier I think and fit it under a seat or maybe under the sink in the bathroom...the idea of the towel rail is that the bathroom can be used as a drying room with the door shut and extraction fan on when driving along.

Ivan C
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Re: Diesel heater location

Postby Ivan C » Sat Nov 10, 2018 8:20 am

I ordered a 22l surecal and expansion chamber last night.
I agree with some form of shielding for the heater, after all they are normally under bonnet, rather than completely exposed.
I've been puzzling over recovering engine heat.
I could pipe coolant into the habitation box, but Iwant to leave the engine cooling system un-touched.
A heat exchanger makes the two systems more independent and reduces the alteration of the engine system
The other alternative I had thought of was an exhaust heat exchanger, either a coil or a jacket design. I'll have a s/s exhaust to fabricate anyway so it's almost a logical step to put in a heat exchanger, in place of a silencer.
Feel free to shoot me down :D
The only issue I can think of is that the exhaust gets much warmer than engine coolant.
Ivan C


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