Patent ID: 7523873

Claim:
A closed heating system comprising: a reservoir tank filled with hydraulic fluid; a pump located in said reservoir tank, said pump being driven by a motor external to the reservoir tank, said pump adapted to pump said hydraulic fluid under pressure out of said reservoir tank; a distribution line attached to said reservoir tank, said distribution line adapted to receive said hydraulic fluid under pressure out of said reservoir tank; a heat exchanger with an entry end and an exit end, said heat exchanger entry end interconnected to said distribution line, said heat exchanger entry end adapted to receive said hydraulic fluid and pass said hydraulic fluid through to said heat exchanger exit end; a system return line connected to said heat exchanger exit end; a first restrictor having an entry end and an exit end, said first restrictor entry end interconnected to said system return line; a second restrictor having an entry end and an exit end, said second restrictor entry end interconnected to said first restrictor exit end, said second restrictor exit end attached to said reservoir tank; wherein each said restrictor entry end being defined as that part of the restrictor in which the returning hydraulic fluid first enters the restrictor, each said restrictor exit end being defined as that part of the restrictor from which the restricted hydraulic fluid exits; wherein said pump is adapted to draw the hydraulic fluid from the heat exchanger exit end, into the return line, through the first restrictor, through the second restrictor and back into the reservoir tank; wherein said heat exchanger provides a heat transfer means attached to a means for circulating a heated fluid through a household; wherein, said first and second restrictors are identical, each said restrictor having a cylindrical side wall extending from said entry end to said exit end, each said restrictor being generally cylindrical in shape, the longitudinal axis of each said restrictor being defined by said entry end and said exit end, each said entry end, exit end and side wall defining a generally solid restrictor interior, each said restrictor exit end having an open central aperture extending a predetermined distance toward the entry end, each said restrictor entry end having four apertures formed therein, said apertures being equally positioned radially about a center and near to an entry end perimeter, said entry end apertures extending to and join together at the exit end central aperture within said restrictor interior.