Toilet leaking at base when water heater is on

As Newman stated, there is no relation between the Toilet water and the Water Heater water. EVEN if you had hot water to the toilet input, the hot water increase pressure(VERY SMALL) would not leak out at the Toilet base. You have a HOT water leak that is caused by the small increase in water pressure, probably at the EXIT HOT fitting of the water heater. The HOT water is causing the line bevel washer to leak from the HOT of the fitting. Can you get access to the back of the water heater? Doug