Wall around water heater, waterproofing requirements in basement?

[Awes78]

Have read through the industry regulations for wet rooms but feel mixed messages.

We have a boiler room partially underground.
Plastered walls, 2 facing outwards.
Uninsulated concrete floor, which is now broken up.
We are considering laying ground foam insulation then pouring a new floor.

But what I now read is that a waterproof membrane is required where the water heater will stand.
What does that really mean?

Basements with uninsulated floors are exempt from waterproofing requirements.

 

[hempularen]

I don't have the completely correct answer, but if you insulate with styrofoam under the floor, then you have an insulated floor.

It is not whether it is insulated or not that usually determines if it should have a moisture barrier (I am not sure of the regulations for VBB). Rather, it is whether you can expect moisture from outside. If you can expect moisture from outside, then you should not trap it with a moisture barrier.

 

[Awes78]

Ok, so then we can add Styrofoam and I expect moisture from the outside.
What gives me mixed messages is that it states if there's a water heater, the floor should be sealed but not the wall.

(edited a bit)

 

[mexitegel]

Think practically instead, what happens if the VVB starts leaking? Where does the water go?

 

[Awes78]

Think practically instead, what happens if the VVB springs a leak? Where does the water go?

Practically speaking, it runs down onto our tiled floor and into the floor drain.
But of course, if it sprays against the wall, it probably penetrates further into the wall without waterproofing.