Question about Truma water heater

Apr 9, 2013
651
338
Ayr
Funster No
25,458
MH
A class
Exp
Newbie
Whilst poking around tracing pipework I noticed this oddity in my system. I say oddity but only because I'm not sure how it works (although I can guess)

There is a T-piece fitted to the heater's HW outlet, one arm straight, the other right-angled. The straight leg seems to be the HW feed for all the taps etc., the right-angle one is connected to an open pipe exiting through the floor. There are no valves on this second pipe, it's just open ended. It doesn't *look* like there's anything to hold the water in the system when pressurised. Would I be right in thinking that the right-angled arm is plugged with wax or something that melts should the boiler seriously overheat?image.jpgTim
 
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