I never said it was about 45 quid, it's about firstly understanding why you think a diesel water heater will stop the van freezing ?
The joints leaked because you let the van freeze up, I'm not siding with either you or k systems, I genuinely can't get a grasp of your original post,
But what I can say is that PF say a day to fit a heater at £400+ you paid £45 perhaps you got exactly what you paid for ?
Who knows what your actual agreement was, certainly not clear to me
Darran