(under subclass 406) Devices comprising an injector or tubes connected in such a manner as to act like an injector and having means for heating part of the water to a higher temperature in a separate compartment or conduit that delivers the water heated in the separate compartment to the injector for increasing the circulation.
SEE OR SEARCH THIS CLASS, SUBCLASS:
384, 398 and 404, for related art on the injector action.
