Heat sources
Each option is checked against your loop over a full year, with the well loop's temperature simulated over its design life. Select a row to see its design week.
| Heat source | Peak heat it can add | vs. your peak | Coldest water | Electricity / yr | Cost / yr | Status |
|---|
Design week
Through the year
Soil temperature at pipe depth changes slowly through the year; the heat needed to warm each draw does not.
| Month | Air °C | Soil at pipe °C | Pipe heat loss W | Pump heat kWh/week | Heat added kWh/week | Peak kW | Coldest water °C | Warmest water °C |
|---|
What changes the answer
Heating setpoint
The water leaving the heat exchanger. Well water arrives at , so each extra degree adds about 10 kW during every draw.
Pump control between draws
Pump friction heat grows roughly with the cube of flow, so pump speed decides how warm the loop gets when nothing is drawn. Every option runs at full flow during draws. "Without added heat" shows whether the pump alone still keeps the loop above freezing if the heat source fails.
If the circulation pump stops
Heat can only reach the pipe while water moves, so no heat source protects stagnant water. Standing water in the coldest ground:
How it's calculated
Every formula with your current numbers. Soil, pipe and pump for ; the well check for the selected heat source.