I wrote:
> I think there was more than 5,400 L in the holding tanks. The condensate > could have been coming back at a higher temperature than the tanks. I should have said the condensate *must* have been coming back at a higher temperature than the water in the tanks. It must have been well above 18°C or the tank temperature would not have risen. It would be hard to estimate how much higher it would be because the tanks also lose heat, and we do not know the ambient temperature. The feedwater temperature is recorded in the spreadsheet, and it gradually rises. - Jed
