Abstract: A de-aerator for removing dissolved gasses from water in a water heating system and a water heating system comprising such a de-aerator are disclosed. The de-aerator includes a vessel defining a chamber for receiving water which has been heated by a primary water heater, an inlet through which water can be supplied into the chamber and an outlet through which the water can exit the chamber; and a vent through which gas can exit the chamber. A diameter of the chamber decreases in a direction from the inlet towards the outlet. The chamber side wall being curved and having a non-constant radius of curvature, the radius of curvature being smaller near the outlet than near the inlet, so that water supplied into the chamber is accelerated as it flows from the inlet towards the outlet, to thereby promote de-aeration of the water. De-aeration gasses exit the chamber through the vent.

Abstract: A de-aerator for removing dissolved gasses from water in a water heating system and a water heating system comprising such a de-aerator are disclosed. The de-aerator includes a vessel defining a chamber for receiving water which has been heated by a primary water heater, an inlet through which water can be supplied into the chamber and an outlet through which the water can exit the chamber; and a vent through which gas can exit the chamber. A diameter of the chamber decreases in a direction from the inlet towards the outlet. The chamber side wall being curved and having a non-constant radius of curvature, the radius of curvature being smaller near the outlet than near the inlet, so that water supplied into the chamber is accelerated as it flows from the inlet towards the outlet, to thereby promote de-aeration of the water. De-aeration gasses exit the chamber through the vent.

Abstract: A fluid containment and transfer vessel having a chamber defining a fluid inlet for receiving fluid from a primary heater and a separate fluid outlet for delivery of fluid at least to be circulated via a circulated fluid central heating system, the chamber adapted to contain fluid in use to such a level as to define a header region surmounting the fluid therein, wherein the inlet is provided into the header region, the outlet is provided at a base portion of the chamber, and a conduit is provided within the chamber open at either end and with a first end in the vicinity of and generally above the outlet and a second end venting out of the vessel at a higher point thereto in use.