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Old 02-23-2016, 10:31 PM   #1
Corbury1492
 
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Default Electric Water Heater for Occasional Domestic Hot Water?

Hi - I'm wondering if an electric hot water heater like the Bosch Tronic 3000T Mini-Tank Series ES 2.5 would be a good option for occasional hot showers out the back door of my sprinter.

I'm looking to hose-off after biking. I would hook this up to something like:
1. 2000 watt inverter
hooked up to
2. aux battery system - 2 x 6v (golf cart) batteries in series.

The Bosch is 12A / 120V and 1440W. I understand that I could not shower for 15 min - but I won't have more than 15 gal of fresh water. Water recovery rate is 6.8 GPH at 90F rise - so i'm looking at running it for 20 min to raise the 2.5 Gal tank. Take a 5 min shower and then I am done. Worst case wait another 20 min and take another short shower.

If my aux battery has 120 Amp hours then I can run this for 10 hours before the battery is dead - do I have this right? Full disclosure - I know almost nothing about electrical - thus I am asking this question. Please set me straight.

Thanks!
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Old 02-23-2016, 11:00 PM   #2
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

You missed voltage, 120V is not 12V. Current [A] = Power [W] / Voltage [V] so 1440W / 12V = 120A. Your battery capacity of 120 Ah is actually only 60Ah to keep it above 50% max drain so 60Ah / 120A = 1/2 hour you have to heat water. This is the reason why MOST folks don't use electrical energy to heat water unless you are on shore power. http://www.delorie.com/electronics/ohmslaw.html

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This subject was discussed on this forum often, just search.
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Last edited by GeorgeRa; 02-23-2016 at 11:03 PM.
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Old 02-24-2016, 03:46 AM   #3
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

There are a lot of DIY schemes for hot water heaters that are used for showers. I like keeping things modular, so I'm going to get a 5gal insulated water container and use a 500 watt (120vac) emersion heater, possibly an aquarium heater! They come with built in thermostat so you don't need any other parts or pieces, but they max out at 95-98 degrees fahrenheit. For the actual shower part, there are battery or 12vdc powered showerhead/pumps for about $20. You just put the end of the hose in the hot water and then turn on the pump; some have a foot switch.

There are camping systems that use a small propane tank, like for a camp stove. The kits have everything you need and cost about $150. The nice thing about those is that the water amount is only limited by the size of the container you syphon from. Do a websearch for "Zodi"

On Sprinters, you can open the rear doors and then put a bar across between the doors resting on top, and hang a shower curtain from it, and you have an instant shower enclosure. Or just some good size rare earth magnets holding the shower curtain to the doors.
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Old 02-24-2016, 05:17 AM   #4
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

I plan to hang one of these by the rear doors, super cheap too:
Eccotemp L5 Portable Tankless Water Heater (https://www.eccotemp.com/eccotemp-l5...-water-heater/)
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Old 02-24-2016, 06:02 AM   #5
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

Quote:
Originally Posted by jme3505 View Post
I plan to hang one of these by the rear doors, super cheap too:
Eccotemp L5 Portable Tankless Water Heater (https://www.eccotemp.com/eccotemp-l5...-water-heater/)
I looked at those, I might reconsider after pricing all the parts for a DIY water heater. Needs a water source and a pump. There's a cheap stainless (marine) 12vdc pump at Harbor Freight, $25.
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Old 02-24-2016, 06:22 AM   #6
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

Quote:
Originally Posted by Corbury1492 View Post
Hi - I'm wondering if an electric hot water heater like the Bosch Tronic 3000T Mini-Tank Series ES 2.5 would be a good option for occasional hot showers out the back door of my sprinter.

I'm looking to hose-off after biking. I would hook this up to something like:
1. 2000 watt inverter
hooked up to
2. aux battery system - 2 x 6v (golf cart) batteries in series.

The Bosch is 12A / 120V and 1440W. I understand that I could not shower for 15 min - but I won't have more than 15 gal of fresh water. Water recovery rate is 6.8 GPH at 90F rise - so i'm looking at running it for 20 min to raise the 2.5 Gal tank. Take a 5 min shower and then I am done. Worst case wait another 20 min and take another short shower.

If my aux battery has 120 Amp hours then I can run this for 10 hours before the battery is dead - do I have this right? Full disclosure - I know almost nothing about electrical - thus I am asking this question. Please set me straight.

Thanks!
If you need just a quick shower you could use your Airtronics D2 to heat water. Inertiaman has experimented with an air to liquid heat exchanger proving feasibility. Search for D2 water heating under his name. I don't know what is the state of this project.

George.

http://sprinter-source.com/forum/sho...+water+heating
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Last edited by GeorgeRa; 02-24-2016 at 06:29 AM.
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Old 02-24-2016, 06:28 AM   #7
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

We really like our Isotemp 4 gallon water heater located under the hood.
It's not an easy install but makes hot water using engine coolant or with
700 watt 120V element.

If heated by the engine, it stays warm for about 6 hours. I had to
relocate the ECU, washer bottle and bend a brake line out of the way
slightly to make it fit.

We do offer a CNC'd platform for it to sit on. And also have a bracket
to relocate the washer bottle - if you don't have the small
DEF tank in the engine compartment. PM me for more info.

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Old 02-24-2016, 12:09 PM   #8
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

I'm going to try the Ecotemp unit for my out the back shower...
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Old 02-24-2016, 01:00 PM   #9
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

Another option, the Mr.Heater Aquacube.



http://www.mrheater.com/sporting/aqu...le-shower.html
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Old 02-24-2016, 01:12 PM   #10
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Default Re: Electric Water Heater for Occasional Domestic Hot Water?

That IS interesting. If I didn't already have a 25 gallon fresh water tank, I would consider this. The ecotemp at 120 bucks seems like a no brainer for me.
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