We had such pressure-operated dish-washer in 1958. It operated spendidly until the kitchenmaid advertized how convenient it was. They realized it wasted about a

We had such pressure-operated dish-washer in 1958. It operated spendidly until the kitchenmaid advertized how convenient it was. They realized it wasted about a ton of heated water everytime, no recirculation of any kind. And this heat was created by janitor shovelling coal in the boilerroom for hours everyday. No central heating plants in Helsinki at that time.