Hot Water Mixing Calculator
Estimate the hot and cold water portions needed to reach a target mixed temperature.
Estimated result
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How this calculator works
Estimate the hot and cold water portions needed to reach a target mixed temperature.
Hot portion = total × (target − cold) ÷ (hot − cold)
Planning note
Results are estimates. Confirm local plumbing codes, product specifications and licensed-professional requirements before construction or safety-critical work.