Hot water from the tank is pumped to the house radiant floor heating system as the house needs heat. (builditsolar.com)
It is very popular for use with concrete in floor heating systems, swimming pool heating, or any other application where large quantities of hot water are required. (ahac.ie)
The effect on thermal comfort must have been similar to that of a modern - day hot water or electricity - based radiant floor heating system. (lowtechmagazine.com)