(57) Apparatus to circulate and heat liquid, such as water, which apparatus includes an
incorporated or separate source of heat (2) and a liquid inlet pipe (10) and a liquid
outlet pipe (12), and inside which apparatus is arranged, connected to the outlet
pipe (12), a preferably spiral pipe (11) for heating the liquid to its final temperature.
In known heating systems, it is not enough to heat the water, also a circulation water
pump is needed. With this invention, the need for a circulation water pump is eliminated
by that the inlet pipe (10) and the outlet pipe (12) are each equipped with a back-pressure
valve (13, 14), and that inside the apparatus, between the inlet pipe (10) and the
spiral pipe (11) is installed an element (7) comprising a liquid space (8) with a
direct connection to the inlet pipe (10) and the spiral pipe (11) and, connected with
said space, a vaporizing space (9) which quickly vaporizes the liquid.
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