After 3 years of staying over at gran's house at the weekends and sleeping in the bedroom myself for 20 years, I've realized there is a hot water tank in my daughter's bedroom! Both my mum and gran think I'm being unreasonable about this. I think there are potential safety risks and she should not sleep in there until it's at least been serviced (hasn't been for 20 years!). The tank is part of the heating system attached to a rayburn downstairs and stored the hot water for showers etc. It's not really hot and we keep the airing cupboard locked but I'm still worried about a potential leak/explosion. Any thoughts on this? How do I move forward?