unknown hose discovered on my 2003 symbol

Following on from my MOT I had to have a new offside sill , inside and outer. On getting the symbol back the mechanic pointed out the above mentioned hose which appears to come from the side of the van underneath and goes nowhere. From its point of origin I would guess that it is some kind off emergency run off for the water heater. Can anyone help, am i assuming correctly?

I had to have the offside sill repaired on my 2000 Symbol 3 years ago. The only hose that went through the sill was the hose from the water fill point on the side of the van to the water tank inlet underneath the van. I had to have this hose replaced as the welding destroyed it. Suggest yoy check thatvyou can still fill the tank up. Neither of the two hoses, inlet and outlet, of the water heater, pass through the sill. Not sure if your later Symbol will be the same though. We're currently away touring in Spain with variable wifi so apologies in advance if I'm unable to respond further.

Rgds

Mikebro