Pipe Heat Loss Calculator
Calculate energy and cost lost through uninsulated hot water pipes.
Table of Contents
Pipe Settings
Heat Loss & Standby Cost
Adding pipe insulation pays for itself in under a year by retaining heat between water draws and reducing energy costs.
Pipe Heat Loss Calculation
Hot water sitting in uninsulated pipes radiates heat energy into crawlspaces and walls, causing standby cooling. Insulating pipes retains hot water temperature for subsequent usage cycles.
Formula Used
Hourly BTU Heat Loss = Pipe Length * Surface Area * Heat Transfer Coefficient * Temp Difference
Reference Quick Chart
| Pipe Material | Insulation Status | Heat Loss Rate (BTU/hr/ft) |
|---|---|---|
| Bare Copper (3/4") | None | 30 - 45 BTU / hr / ft |
| Bare PEX (3/4") | None | 15 - 25 BTU / hr / ft |
| Copper Insulated (3/4") | 1/2" Foam | 6 - 9 BTU / hr / ft |
| PEX Insulated (3/4") | 1/2" Foam | 4 - 6 BTU / hr / ft |
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