Patent ID: 7048200

Claim:
An integrated injection-pumping fixture for hydronic heating systems, for providing an injection loop for transferring heat from a higher-temperature loop to a lower-temperature loop, the fixture comprising: an integrated casting; higher-temperature supply and return ports formed in the integrated casting; lower-temperature supply and return ports formed in the integrated casting; an injection pump volute formed in the integrated casting and configured to accept an impeller of an injection pump; and a lower-temperature loop pump volute formed in the integrated casting and configured to accept an impeller of a lower-temperature loop pump, wherein liquid from the higher-temperature loop enters the integrated casting through the higher-temperature supply port, mixes with liquid circulating in the lower-temperature loop, and leaves the integrated casting through the higher-temperature return port, and wherein liquid circulating in the lower-temperature loop enters the integrated casting through the lower-temperature return port, mixes with liquid entering from the higher-temperature loop, and leaves the integrated casting through the lower-temperature supply port.