US Patent 8074894 Secondary mixing valve hot port

A thermostatic mixing valve for mixing a hot fluid and a cold fluid to produce a tempered mixed fluid stream. The thermostatic mixing valve may have a valve body that defines a cold fluid inlet port, a hot fluid inlet port, a mixing chamber, a mixed fluid outlet port in fluid communication with the mixing chamber, and a hot fluid outlet port in fluid communication with the hot fluid inlet port and disposed upstream of the mixing chamber. In some cases, the hot fluid outlet port may be used to provide hot water directly to an appliance or other fixture that can use non-tempered hot water.