Bucket-a-Day

I've started reading P.D.James "Time To Be in Earnest"-- a sort of memoir in diary form.  Describing her childhood she mentioned heating the water for the weekly bath.  Don't know why that cause me to think of our "bucket-a-day". Here's an article discussing a modern use.  For us we used it in the summer only.  The rest of the year we had the coal stove going.  In addition to cooking and heating part of the downstairs the stove also heated our water.  Pipes ran through it to capture heat from the fire.  The heated water, being less dense than cold, would rise through a pipe to a tank in the upstairs bathroom.  When you opened the hot water faucets in the kitchen and downstairs half-bath the hot water was drawn from the tank to the faucets.