Anyone add undermount freshwater to a 144 4WD VS30

[w15p]

I'm looking at taking my interior back to the drawing board and reclaiming the space that I had set aside for water. I think I can mount the hot water tank on the driver side and am trying to figure out if I can reasonably add a freshwater tank to the passenger side. From my measurements, I can really only get something 6.5"x9"x57" in there and am not seeing any commercial tanks with anywhere close to those dimensions. Even optimistically assuming that I could take up that entire space with zero wall thickness, that's still only a little over 14 gallons. More realistic is probably 13. Is this worth it?

I did read up on @GeorgeRa's build including the recommendation of internal baffles, but having never done a build of a water tank at all, I don't know reasonable fittings for fill, output, vent, monitoring, (heating to prevent freezing?) and would appreciate pointers if anyone has experience.

Fresh Water Tank under the chassis Questions

Looking at putting a 8"X 11"x 48" 16 gallon fresh water tank under the chassis on the driver's side on a NCV3 Sprinter 144, (right behind the drivers seat). This would be directly under my stove/sink/ref cabinet. The water fill access positioned on the counter top (stainless marine style deck...

sprinter-source.com

Layout plan.

Very nice design work. You make us all look like beginners. FYI my 7 night trip to NW Sprinterfest was done without any charging other than the 135 watt 17.7 volt Kyocera solar panel. Lowest SOC was 88%. Weather was combination of sunny days and overcast days. On my way back home I stopped...

sprinter-source.com

@GeorgeRa Do you have higher resolution images of your design? I tried enlarging them but the text was mangled.

Thanks in advance, any and all, for info on this.

 

[GeorgeRa]

I'm looking at taking my interior back to the drawing board and reclaiming the space that I had set aside for water. I think I can mount the hot water tank on the driver side and am trying to figure out if I can reasonably add a freshwater tank to the passenger side. From my measurements, I can really only get something 6.5"x9"x57" in there and am not seeing any commercial tanks with anywhere close to those dimensions. Even optimistically assuming that I could take up that entire space with zero wall thickness, that's still only a little over 14 gallons. More realistic is probably 13. Is this worth it?

I did read up on @GeorgeRa's build including the recommendation of internal baffles, but having never done a build of a water tank at all, I don't know reasonable fittings for fill, output, vent, monitoring, (heating to prevent freezing?) and would appreciate pointers if anyone has experience.

@GeorgeRa Do you have higher resolution images of your design? I tried enlarging them but the text was mangled.

Thanks in advance, any and all, for info on this.

Here are topic related album links, there will be some duplicates. Let me know if you need specific dimensions.

https://photos.app.goo.gl/USxq1SZzbtt16D3k6
https://photos.app.goo.gl/Px7jzEn9m1RWjCt76
https://photos.app.goo.gl/PTGyzPAFkbF4F62HA
https://goo.gl/photos/2NCR3teXLSwNYSwN8
https://goo.gl/photos/AZnG63iwMr9u6zLw8
https://photos.app.goo.gl/NFFgmpy2WLQWmF156
https://goo.gl/photos/KHrmetWa81i7jMRT6
https://photos.app.goo.gl/ZaRjV7VwXzEs8w8r9
https://goo.gl/photos/D6ScLYL9UYFbcw3n8
https://goo.gl/photos/UVupnzpkrGAVs4sUA
https://goo.gl/photos/Mdqa7sxApbQ5csCQ7
https://photos.app.goo.gl/4qsN9M2NOGKM2uDK2
https://photos.app.goo.gl/Ey4XSxqnLjWX2nzx1
https://photos.app.goo.gl/JVZNxKpmAm3H5t6X7
https://photos.app.goo.gl/L7IenChbSBebzG9r1
https://goo.gl/photos/Jbb4PLmnUzRTWksd6

 

[Dendisch]

I have a 7 gal tank on the passenger side inside the van and a 20 gal tank on the driver side under the van. The large tank can fill the small one through a small pump. If it’s too cold outside I will only use the internal tank. I’m planning for a 7 gal grey water tank underneath on the passenger side, but haven’t had time yet. I don’t have a hot water tank.
I agree it’s difficult to find a good size. My 20 gal tank is too tall and sticks out more than I like. If I find a shallower, possibly longer tank I would replace it.

 

[Kajtek1]

I found perfectly fitting tanks on amazon
This is for 170 wheelbase, but the seller also has shorter models. https://www.amazon.com/gp/product/B07LBB4RTF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[w15p]

I found perfectly fitting tanks on amazon
This is for 170 wheelbase, but the seller also has shorter models. https://www.amazon.com/gp/product/B07LBB4RTF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Interesting - not just a length problem. I don't have that much available width on my passenger side and the driver side is largely taken up by the H13 blower, which I guess I could rip out and replace with a D2 under the passenger seat, but then we're starting to wag the dog.

 

[Kajtek1]

The Sprinter on the picture has H5 (?) heater, who fits in front of the floor, still leaving space for 2nd water tank.
I am reusing holding tanks from old camper and just for the job learned plastic welding.
It was very easy for me, but I work with torches and rods big chunk of my life. Still with flexible fingers and $40 of welding equipment, you can customize shape of the tank.

 

[Dendisch]

The Sprinter on the picture has H5 (?) heater, who fits in front of the floor, still leaving space for 2nd water tank.
I am reusing holding tanks from old camper and just for the job learned plastic welding.
It was very easy for me, but I work with torches and rods big chunk of my life. Still with flexible fingers and $40 of welding equipment, you can customize shape of the tank.
View attachment 172024

View attachment 172025

Thanks, this is great. Is the tank on the driver’s side the same Amazon link as the passenger side? I didn’t think that the width would work, but I should check again. Or did you modify that one too? I have to look into the plastic welding...

 

[Kajtek1]

Both water tanks on sides are the same, what manufacturer sold.
It is gray & black water tanks that I had to modify.

 

[jonathon]

We used the 20 Gallon Holding Tank - $74.99 (affiliate link) in our 144 under the chassis behind the drivers seat. We had to remove the massive H13 blower as you noted, but I think it was well worth it since we couldn't run ours without the engine running (our van didn't come with option of the timer for running the heater with the engine off) The same seller also have this 15 Gallon Holding Tank - $49.99 (affiliate link) that may fit with that blower too, but I doubt it.