Compare winter and summer inlet temperatures
A homeowner heats 100 L to the same 50°C outlet temperature year-round. Sample inlet temperatures are 10°C in winter and 20°C in summer.
Open CalculatorInputs and calculation
| Tool input | Value |
|---|---|
| Currency | USD |
| Volume or billing unit | liters |
| Volume (L) | 100 |
| Temperature rise (°C) | 40 |
| Heating method | Electric resistance |
| Efficiency (%) | 100 |
| Energy price (USD per input kWh) | 0.25 |
| Water price (USD/L) | 0 |
Heat delivered = 100 × 40 × 0.001163 kWh. Divide by 1 to get about 4.652 input kWh. Multiply input energy by 0.25, add 100 × 0 for water, then round to USD 1.16.
Tool result · USD 1.16
| Tool input | Value |
|---|---|
| Currency | USD |
| Volume or billing unit | liters |
| Volume (L) | 100 |
| Temperature rise (°C) | 30 |
| Heating method | Electric resistance |
| Efficiency (%) | 100 |
| Energy price (USD per input kWh) | 0.25 |
| Water price (USD/L) | 0 |
Heat delivered = 100 × 30 × 0.001163 kWh. Divide by 1 to get about 3.489 input kWh. Multiply input energy by 0.25, add 100 × 0 for water, then round to USD 0.87.
Tool result · USD 0.87
What the comparison shows
Heating the same volume requires one third more energy at a 40°C rise than a 30°C rise. The draw itself stays constant.
Assumptions and limits
Use representative inlet measurements. This isolates the inlet effect and assumes unchanged efficiency and price.