Normally you can see the 'frost line' where the gas is, though this
might not work in a very dry climate.
Is it humid on the Canary Islands ?.

Andrew


On 30/04/2021 07:44, Brian Gaff (Sofa) wrote:
As an aside, in a certain Canary island flat I was in, it was all on bottled
gas, but either seemed to be no indication of the level of gas in the tank.
I soon found out how to tell when it was almost gone, as it had one of those
water heaters we used to know as an Ascot. While using the hot water with
the boiler fired up it suddenly went bang, and shot a plastic bung in the
side across the kitchen and made a dent in the wall.
Asking the service guy for the flats he said, ah, sorry the tank must have
been a bit low and the mixture becomes explosive if that happens and that is
just the safety mechanism to stop a major explosion. So note to self,
watch your levels in bottled gas, particularly in an archaic foreign
installation.
Brian