DHW Recirculation Loop Calculator

Calculate heat loss, pump sizing, and return temperature for domestic hot water recirculation loops.

Pipe Loop Length (ft)

Pipe Diameter (in)

Allowable Temp Drop (°F)

Insulation R-Value

Tab to move between fields

Heat Loss

196 BTU/hr

Required Flow Rate

0.04 GPM

Return Temperature130 °F

Pump Size0.01 HP

How to Use This Calculator

Enter Pipe Loop Length (ft), Pipe Diameter (in), and Allowable Temp Drop (°F).
Set Insulation R-Value.
Review Heat Loss (BTU/hr) and Required Flow Rate (GPM).
Use Return Temperature (°F) and Pump Size (HP) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

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