Model A
—Ideal heating time—
Independent water-heater tool
Geyser Heating-Time, Electricity-Cost & Capacity Comparator
Compare two entered models for ideal heating time, one-batch capacity and a usage-based electricity scenario.
Tank size or star rating alone does not determine actual consumption. Heating energy follows water volume and temperature rise; power mainly changes ideal time.
Step 2
Heating and cost comparison
Enter hot-water need and both product values to compare.
Ideal energy and cost per cycle
— · ——Model B
—Ideal heating time—
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| Model | Per use day | Monthly average | Annual |
|---|
Entered standing-loss comparison
- Lower entered standing loss
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- Annual energy difference
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- Annual cost difference
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- Hours kept hot
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How the calculation works
Ideal kWh = litres × 4.186 × temperature rise ÷ 3600. Time = kWh ÷ heater kW. Comparable entered standing loss is scaled by hours kept hot.
Important limits
Real heating differs with efficiency, thermostat control, mixing and losses. Capacity is only a one-batch screen.
References
Use this comparator to review geyser heating time, electricity cost, storage capacity and standing losses using water temperature, usage and tariff inputs. Enter values that represent the household and the geyser options you are comparing.
What to enter
Use the water-temperature, usage and electricity-tariff inputs requested by the comparator. Check the units and compare options on the same basis. The template controls the actual fields and calculations; this supporting copy does not replace its labels, formulas or result logic.
How to read the comparison
Review heating time, electricity cost, storage capacity and standing losses together. A larger capacity may change heating and standing-loss estimates, but the result is a planning comparison rather than a guarantee of hot-water availability, energy use or performance.
Before choosing a geyser
Verify the product's rated capacity, power, installation instructions and electrical requirements. Consider the actual household usage pattern and incoming water conditions. Have the final circuit, earthing and protective equipment checked by a qualified electrical professional before installation.