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Thermostatic Mixing Valves
Conicting Needs: Water Temperature vs. Water Safety
Theidealtemperaturerangeforsafety(anti-scalding)happenstobetheidealgrowthrangeforbacteria,suchas
Legionella.Thiscreatesaneedforwatertobehotenoughtokillbacteriathroughoutthesystem,yetwatermustbe
coolenoughwhendeliveredtotheendusertoavoidscalding.
Need to Minimize Scalding Injury:
• Maintainthetemperatureofthedeliveredhotwaterbelow120°FtominimizethepotentialofaScaldingInjury
Need to Reduce Bacterial Infection:
• Maintainthetemperatureofthehotwaterheaterto140°FtominimizethepotentialofLegionella
• TMVsdeliverasolutionfortheconictingneedsofreducingbacteria,yetprovidingwateratacomfortable
temperatureforendusers.
Temperature (°F) Bacterial Response Scald Risk
Time to produce 2nd
and 3rd degree burns*
68º
Dormant Low
69º – 122º
GrowthRange
95º – 115º
IdealGrowthRange
122º
CanSurvive,Won’tMultiply Moderate 5min.
131º
5-6HourstoKill Moderate 30sec.
140º
Dieswithin32Minutes High 5sec.
150º
Dieswithin2Minutes VeryHigh 2sec.
*DatafromAmericanBurnAssociation
What is a Thermostatic Mixing Valve (TMV)?
ATMVmixescoldwaterandhotwaterandproducestemperedwaterataconstantpre-settemperature.Byusing
multipleTMVs,thesystemcanbedesignedtopreventbacterialgrowthanddelivertemperedwatertotheenduser,
eliminatingthechanceofscalding.
Point of Source Thermostatic Mixing Valves ASSE 1017:TemperatureActuatedMixingValvesforHotWater
DistributionSystemsareusedforcontrollingin-linewatertemperaturesindomestichotwatersystemsandare
installedatthehotwatersource.Theyarenotintendedforenduseapplicationsincludingemergencyeyewash
andshowerequipment.
Point of Use Thermostatic Mixing Valves ASSE 1070:WaterTemperatureLimitingDevicesshallcontrolandlimit
thewatertemperaturetottingsforxturessuchassinks,lavatoriesorbathtubsandareintendedtoreducetherisk
ofscalding.