My 2018 Auto Sleeper water pump has seized, it is in the under slung tank, I am going away in the van for 3 nights. I can survive with bottled water ect until it is replaced, my question is will the heater work? I imagine that the water pump would be used to fill the boiler after being winterised. Am I correct in thinking this as I will need to take a heater with me, I am correct? Grateful for any info ,thanks.