When I bought this house in 2010 I noticed right away that the plumbing to the toilets is hot water. I was told by local Pocono residents that it's done due to "weeping" I can't get a real good explanation on the internet or from the local folks. So now I'm trying all of you because of your wealth of knowledge. I'm thinking it's to prevent the sewer line exiting the house to the septic and sand mount from freezing. Do any of you have hot water going through your toilets plumbing.
Also in the one toilet every so often the toilet runs a bit of hot water in to the upper tank. That drives me crazy

because it's an electric hot water heater and I can just see the money going down the toilet. The other two toilets do not run like that one. Could it be it's own pressure relief valve or just a leak?
Thank you once again for your expertise.