Paddy walks into The Antiques Roadshow in Dublin and puts a big box on the table.
"Where did you find this"? asked the expert,
"oh...it's been in the attic for years" said Paddy
"Have you got insurance"? asked the expert,
"Why do you ask"? said paddy. "Is it worth a lot of money"?
"No, it's because your going to need it......that's your cold water tank".