Plumbing Thermostatic Mixing Valve Setting Calculator
Calculate caller ideal steady equal-heat-capacity hot/cold mixing split from actual feeds/flow; no valve setting instructions, control response, legionella or scald safety.
Description
Ideal mixing balances hot and cold water to a requested delivery temperature.
Ideal mixing balances hot and cold water to a requested delivery temperature. Equal heat capacities and negligible heat loss make the balance linear.1
The returned values include Ideal hot fraction, Ideal hot liters minute, Ideal cold liters minute. The How section below explains the calculation, input rules and interpretation.
When to use Plumbing Thermostatic Mixing Valve Setting Calculator
Use Plumbing Thermostatic Mixing Valve Setting Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No physical valve dial setting, anti-scald protection or water hygiene assurance is provided.
Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
How to use Plumbing Thermostatic Mixing Valve Setting Calculator and understand its results
- Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
- Enter observedHotFeedC, observedColdFeedC, callerRequestedMixedC, observedTotalMixedLitersMinute using the field table and calculation rules, then run the tool.
- Read idealHotFraction, idealHotLitersMinute, idealColdLitersMinute. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| observedHotFeedC | Observed hot feed c | number | Required |
| observedColdFeedC | Observed cold feed c | number | Required |
| callerRequestedMixedC | Caller requested mixed c | number | Required |
| observedTotalMixedLitersMinute | Observed total mixed liters minute | number | Required |
Enter finite temperatures with hot above cold and requested mixed temperature within their closed interval, plus nonnegative mixed flow. Return hot fraction and both component flows.
hotFraction=(mixed−cold)/(hot−cold); hotFlow=fraction×total; coldFlow=(1−fraction)×total Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| idealHotFraction | Ideal hot fraction | number |
| idealHotLitersMinute | Ideal hot liters minute | number |
| idealColdLitersMinute | Ideal cold liters minute | number |
{
"input": {
"observedHotFeedC": 60,
"observedColdFeedC": 20,
"callerRequestedMixedC": 40,
"observedTotalMixedLitersMinute": 10
},
"output": {
"idealHotFraction": 0.5,
"idealHotLitersMinute": 5,
"idealColdLitersMinute": 5
}
}Limitations and assumptions
No physical valve dial setting, anti-scald protection or water hygiene assurance is provided.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Plumbing Water Heater Sizing Calculator: A storage heater mixes hot water with colder supply water to meet a draw. Recovery during the draw offsets the required usable storage. For a complementary task, use Plumbing Water Heater Energy Calculator: Sensible water-heating energy depends on volume, temperature rise and volumetric heat capacity. Input energy includes an explicit efficiency.
References
Similar or alternative tools
- Plumbing Water Heater Sizing Calculator
A storage heater mixes hot water with colder supply water to meet a draw. Recovery during the draw offsets the required usable storage.
- Plumbing Water Heater Energy Calculator
Sensible water-heating energy depends on volume, temperature rise and volumetric heat capacity. Input energy includes an explicit efficiency.