Webasto to heat Shower Water - Defender Source
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  #1  
Old November 13th, 2015, 07:41 PM
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Webasto to heat Shower Water

We have a Webasto Thermo Top C Diesel fueled Coolant Heater.
Would think this thing heats water pretty hot like above 150 deg F (65.5 C).
I am wondering how to use it to heat water in an on-board water tank for washing and a shower unit.

Any suggestions?
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  #2  
Old November 13th, 2015, 07:46 PM
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Straight water or using heat exchanger?
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Old November 13th, 2015, 07:54 PM
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I am open and have flat plate heat echangers, but was looking for a start cold and get hot quickly (you know the instant gratification scenario), without the result being too hot.
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Old November 13th, 2015, 08:15 PM
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I would just hook it up to the engine per normal and add an exchanger to heat the shower water. That way it is useful for preheating the engine as well.
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Old November 13th, 2015, 08:16 PM
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Alot of ways to go here. You want to chat live this weekend?
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Old November 13th, 2015, 09:03 PM
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------ Follow up post added November 13th, 2015 09:05 PM ------

Quote:
Originally Posted by Red90 View Post
I would just hook it up to the engine per normal and add an exchanger to heat the shower water. That way it is useful for preheating the engine as well.
Very practical approach John.
Was thinking what I could do to have an instant shower for my wife.
Perhaps the HE will come close... only one way to try and that is to install and test it.
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UD: "Just Power through it man!"
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  #7  
Old November 13th, 2015, 09:24 PM
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What Red said but I think that would take a long time to heat the shower water. It also means that the shower system is part of your coolant system and there are potential risks associated with that.

But having it be completely stand alone means you don't get engine preheat, which I think would be ok if you aren't in the arctic (I'm planning on 110v preheat).

Ok so I say let it stand alone. Run a heater core in a five gallon water jug modded with a submerged pump.

- Maybe this 5 gallon jug has quick disconnects? The rest of the webasto setup goes to an aux heater and fan (I have one I'm not going to use see below). Might not heat the engine but will heat the cabin nicely when its not in shower mode.

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Old November 13th, 2015, 09:38 PM
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Quote:
Originally Posted by Red90 View Post
I would just hook it up to the engine per normal and add an exchanger to heat the shower water. That way it is useful for preheating the engine as well.
^this
I have a sprinter based camper and I have an air and water webasto. I rarely use the shower for 2 reasons:
1-it takes a lot of water
2-takes a while to heat

Withe the engine already hot it works best. But when I've heated water with the webasto it takes for ever through the exchanger.
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  #9  
Old November 13th, 2015, 11:43 PM
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I have on in my truck with the timer set it and ready in the morning great pre-heat in mine.
You can pipe it what ever way you want. They use them a lot in the EU.
Winter is coming.
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  #10  
Old November 13th, 2015, 11:53 PM
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The problem with heating shower water with a heat exchanger and engine coolant is that it very quickly becomes much too hot to use. Within a few minutes, only steam is coming out of the nozzle. The best way is to have a divert on your pump where you can re-mix in cold water with the heated water to adjust temperature to something reasonable.
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  #11  
Old November 14th, 2015, 12:10 AM
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Very common in Australia. The good ones I've seen make a very simple exchanger of a copper pipe is a large pvc pipe mounted on the rack. This put a lot of water in the pipe and make it easier to manage temperatures.
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  #12  
Old November 14th, 2015, 10:20 AM
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I would think that the webasto would really be too small to provide the amount of heat necessary to shower a human

How about one of these?
EccoTemp Portable Tankless Water Heater - Eccotemp L5 - Water Heaters - Camping World

Apparently at max burn, the L5 will bring 55 degree intake water to 101 degree shower water
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  #13  
Old November 14th, 2015, 10:26 AM
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The webasto is 5 kW. Tons of heat. If you just want a standalone propane shower there are lots of options. I use a Zodi. Self contained, simple to use and works well.
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  #14  
Old November 14th, 2015, 10:30 AM
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I have a webasto c/z and a red helton tied into my 45L water tank and an AT shower mixer valve. I can tell you the webasto is just fine tied into coolant to warm water to and beyond confort. The issue is circulation.. with my shurflo pressure pump pushing water through exchanger w engine not running, the webasto circulation pump does not flow enough coolant to keep the exchanger hot. Water is flowing much faster than coolant and at thr shower head, the temps begin to drop. Starting vehicle at idle, the engine waterpump has no prob keeping the exchanger nice and hot.

So if you want to shower withoit running engine, the only real solutions are propane on demand hot water heaters, or using webasto in a recirculating tank/watercan to slowly bring showerwater to temp, then using that.
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Old November 14th, 2015, 10:49 AM
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Out of curiosity, what is the advantage of the Webasto? Is it just so that you can use diesel instead of propane?
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  #16  
Old November 14th, 2015, 11:26 AM
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Quote:
Originally Posted by sonoronos View Post
Out of curiosity, what is the advantage of the Webasto? Is it just so that you can use diesel instead of propane?
if you are speaking to me, primary purpose is extreme cold (overlanding/travel) preheating of engine/coolant. Secondary purpose is on-board water system heating through exchanger.

If you were asking Rob, that's for him to answer.
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