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Old 02-16-2018, 12:52 PM   #1
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Indoor Tankless Water Heater Under Skirt

My wife and I are building a short skoolie and I'm trying to get a handle on some of the items we want to install and plan ahead for the space they'll occupy. Has anyone had any experience mounting an indoor tankless system under the skirt? We happen to have quite a bit of space under our bus (I was able to sit upright under it when I was spraying down the seat bolts with PB Blaster) due to it being an accessible bus and I'd rather use that space than interior space. I would most likely build an enclosure of some sort (someone on a skoolie blog used filing cabinets for lots of their under bus storage).

EDIT: For reference, this is the sort I'm considering https://factorypure.com/collections/...eater-open-box
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Old 02-16-2018, 01:01 PM   #2
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Have not done this myself, but it should not be a problem so long as it is enclosed and vented. The enclosure is only necessary to keep out dirt & debris and to prevent the flame from going out (if propane).
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Old 02-16-2018, 01:06 PM   #3
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Have not done this myself, but it should not be a problem so long as it is enclosed and vented. The enclosure is only necessary to keep out dirt & debris and to prevent the flame from going out (if propane).
Thanks for your input! Yeah, the enclosure would mostly be just to make sure the enclosure doesn't take a rock and shatter and, as you said, keep the flame from going out.
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Old 02-16-2018, 01:10 PM   #4
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You might try looking up Ol' Trunt's 1935 Chevy build. He constructed an indoor/outdoor arrangement that is pretty clever.
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Old 02-16-2018, 08:09 PM   #5
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Like Tango said your idea should work fine. The only thing I'd be worried about is water freezing in the heater core and the VERY high temp exhaust from the heater. I would recommend an insulated exhaust stack either inside or outside the bus to keep people from getting burned or setting the woods ablaze.
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Old 02-16-2018, 09:11 PM   #6
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I don't know how exactly to vent the unit from underneath the bus the exhaust on those things get incredibly hot. If it were me I would run a stack through a properly built chase through the roof to avoid roasting an innocent bystander. Gene
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Old 02-26-2018, 12:40 PM   #7
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I don't know how exactly to vent the unit from underneath the bus the exhaust on those things get incredibly hot. If it were me I would run a stack through a properly built chase through the roof to avoid roasting an innocent bystander. Gene
Thank you for your insight Gene. I was thinking about venting it next to the bus' own exhaust tip. I figured if someone's going to get scorched, it'd be right there.
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Old 02-26-2018, 03:32 PM   #8
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Be careful with those tankless units. Some are not designed for through-wall exhausting and require a roof exhaust. If that unit has a pilot light, it may get blown out while driving. I wouldn't rely on the safety to keep from filling the bus with vapor. I always shut off my propane tanks while driving and at night, unless my heat requires it.
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Old 02-26-2018, 03:37 PM   #9
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Be careful with those tankless units. Some are not designed for through-wall exhausting and require a roof exhaust. If that unit has a pilot light, it may get blown out while driving. I wouldn't rely on the safety to keep from filling the bus with vapor. I always shut off my propane tanks while driving and at night, unless my heat requires it.
Thank you for the advice! I'm definitely planning on installing a shut-off within the bus so I can make sure the stove and water heater aren't running when I don't want them to. And I appreciate the tip regarding through-wall venting. I did actually look to be sure that this model was capable (that and the price were some of the reasons I zeroed in on it).
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Old 02-26-2018, 04:00 PM   #10
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Thank you for the advice! I'm definitely planning on installing a shut-off within the bus so I can make sure the stove and water heater aren't running when I don't want them to. And I appreciate the tip regarding through-wall venting. I did actually look to be sure that this model was capable (that and the price were some of the reasons I zeroed in on it).

You're welcome. Happy to help.
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