A thermostatic mixing valve body 12 comprises hot and cold water inlet ports 14, 16 and a mixing chamber 56 receiving a thermostatic mixing valve cartridge 112. The body has a hot water passageway 54 extending between the hot water inlet 14 and the mixing chamber 56 and a cold water passageway 52 extending between the cold water inlet 16 and the mixing chamber 56. The body also has a bypass passageway 90 extending between the hot and cold water passageways 54, 52 upstream of the mixing chamber 56 and a bypass valve 94 arranged to selectively block the bypass passageway 90. The body has an isolating valve 64 to selectively block an opening 66 of the cold water passageway 52 upstream of the bypass passageway 90. The isolating valve 64 has an actuation mechanism accessible from the exterior of the valve body.
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