Globalti
Legendary Member
If your radiator was at 80c I would suggest you get a plumber round fast because your heating system is dangerously overheated and something will soon fail, starting with the wax cartridges in the shower thermostat and in the TRVs, if you have any. Central heating and hot water is supposed to be limited to 60c, which is hot enough to be effective but not hot enough to cause damage to the components.