Solar heater for swim pools

Claim 1

A solar heater of the class described comprising a plurality of tubes extending from a common inlet manifold and arranged sinuously over an area exposed to solar radiation, an outlet manifold serving as a terminus for said tubes, the tubes extending between the inlet and outlet manifolds being arranged in parallel sets connected in series by 180* bends at alternate ends whereby each tube provides a individual passage from manifold to manifold and the set of tubes connected to the outlet manifold being inclined upwardly to enter the outlet manifold at a higher level than that of the inlet manifold, a hollow receptacle disposed above said outlet manifold, a pressure equalizing tube connecting one of the heater tubes directly into the bottom of the receptacle from a point adjacent that where the set of tubes connected to the outlet manifold begins to rise, a riser pipe leading from the outlet manifold and opening into said receptacle adjacent the top thereof, a pipe connected to said inlet manifold and opening into the bottom of the receptacle, and a heat carrying liquid filling said receptacle and said tubes.