| 摘要 |
A heating apparatus for a domestic central heating system. The apparatus comprising a reservoir (15) for heat transfer fluid. A pump assembly (33) comprises a pump (33) and a pressure relief valve (35), wherein the pump is arranged, in use, to draw a heat transfer fluid from the reservoir and wherein the pressure relief valve is arranged, in use, to control the pressure on the outlet side of the pump assembly by diverting a first portion of the heat transfer fluid to the reservoir. A flow restriction (47) is located upstream of the pump assembly. The pressure relief valve is arranged, in use, to divert a second portion of the heat transfer fluid through the flow restriction to heat the second portion of heat transfer fluid, and to return the heated heat transfer fluid to the reservoir. |
