Our toilet is leaking underneath the cistern. Just dripping and only when it is completely full. If emptied (and some water still remains at the bottom), then no dripping occurs. We suspect the o-ring, but unsure.
I have a solar water heating system on top of my roof. It is an evacuate glass heat pipe collector and the geyser. The connection between the heat pipes and the geyser requires "heat paste" (which must cover the end of the heat pipe that goes into the receptor in the geyser) to enhance the heat that must be transmitted...