"fireblade" wrote in message
...

snipped
the state of the rest of the plumbing in this
house it wouldnt surprise me if there was suppose to be one and isnt lol.
the heating and hot waters always worked fine tho. Just wondering?....


There may be a tiny tank hidden at the back of your main tank. These header
tanks are not usually huge big things, but only enough to hold a few gallons
to fill the heat exchanger in the boiler. Out with the torch and go have a
look in the attic.

It may also be that the boiler is fitted with an expansion vessel nearby.
It will look like a big red balloon somewhere near the boiler. Another
alternative that was used years ago, was to take the same feed pipe as the
hot water tank, so that might also be worth a look.