On 2 Dec, 15:10, John Rumm wrote:

The only time a
pressurised water cylinder is at explosion risk is going to be when it
has the possibility of being heated to over the boiling point of the
water content.

Not true. It's a pressurised system with an air reservoir. If
punctured, it will spray hot water at system pressure in a way that
vented systems won't. That's itself a hazard (depending on location).

Any central heating system capable of sinking a trawler (look it up!)
needs some degree of care in its maintenance.