Propane water heater placement.

[Chrise]

Short and sweet: is there any regulation stating how far a propane water heater must be from the diesel fuel door?

[o1marc]

Not that I know of. Keep in mind diesel fuel is not explosive so it's not a huge concern. Use common sense and make sure the venting is proper and the unit is installed correctly.

[Rucker]

Originally Posted by Chrise

Short and sweet: is there any regulation stating how far a propane water heater must be from the diesel fuel door?

I'm not seeing anything specific out there.

Our friend Wikipedia has this, https://en.wikipedia.org/wiki/Flash_point, though to be honest the article is not written well.

Diesel fumes are dangerous, though less so that gasoline fumes. I wouldn't put a source of flame anywhere below a diesel inlet, or anywhere where diesel could splash. On a hot day diesel is just as capable of producing combustible fumes as gas.

https://forestresources.org/digital-...-vapor-hazards

[Simplicity]

Is your hot water heater vented or ventless?

If vented, I'd make sure the vent is well away from anything combustible. You can always run the plumbing a little farther to the sink or bath/shower.

If it's ventless, then there should not be a concern, as the hot water heater is contained inside the bus, and the diesel fill spout is outside.

That said, if it's a ventless, make sure the hot water heater has a way to let the heat vent into the cabin. I mistakenly put mine under the kitchen sink not realizing how hot the radiated heat is.

[Danjo]

3 feet. At least that’s the distance for propane from an ignition source.