Temperature Rise Calculator
Temperature Rise Calculator
Calculate your ground water temperature and required heating power rise.
Table of Contents
Settings
US North: ~40-50°F, South: ~60-70°F
Comfortable shower: ~105-110°F
Output Performance
Required Temp Rise
65°F
Max Continuous Flow
0.0 GPM
Fixtures Supported Simultaneously
Note: Tankless heaters depend directly on temperature rise. In colder northern climates, your tankless water heater flow capacity is reduced significantly!
Temperature Rise Formula
Calculates the degree rise needed. Since incoming groundwater is cooler in Northern regions, winter heaters must perform a much higher temperature lift than in Southern regions.
Formula Used
Required Rise (ΔT) = Desired Shower/Tap Temp (120*F) - Incoming Groundwater Temp
Reference Quick Chart
| Inlet Groundwater Region | Ground Temperature | Required Rise for 120°F Tap |
|---|---|---|
| Northern US / Canada (Winter) | 35°F - 45°F | 75°F - 85°F Temperature Rise |
| Central US (Year-round average) | 50°F - 55°F | 65°F - 70°F Temperature Rise |
| Southern US / Florida (Summer) | 65°F - 75°F | 45°F - 55°F Temperature Rise |
Recommended Water Heater Products
As an Amazon Associate we earn from qualifying purchases.
High Efficiency
Top Rated
Tankless Water Heaters
Save up to 50% on energy costs with an endless supply of hot water. Best for active, multi-shower households looking to cut utility bills.
Traditional Storage
Best Value
Storage Tank Water Heaters
Reliable and affordable upfront solutions. Delivers high peak-hour volume to ensure you never run out of hot water during busy mornings.