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?
Tim
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?