The Appliance Comparison Calculator looks at one specific question inside kitchen thermodynamics and energy economics: what do your appliance efficiency actually add up to? Instead of a vague feeling, it converts the everyday signals you already notice — water volume, impatience level, appliance type, appliance power — into a single score you can track, compare and act on.
The model is built on energy-balance thermodynamics and appliance-efficiency data, the same foundation as our flagship kitchen calculator. Each input is weighted by how strongly that factor predicts real outcomes in the research; the formula and every weight are published below, so you can see exactly why your score is what it is — and argue with it if you like.
Adjust the sliders to match your situation honestly and the score updates live, along with the strongest factors pushing it up or down. Like everything on Quirkulator, the computation runs entirely in your browser: nothing you enter is ever transmitted or stored.
The formula
w1·volume- Water volume (weight +0.9)
w2·impatience- Your impatience level (weight +0.5)
w3·watts- Appliance power (weight -0.9)
w4·start temp- Starting temperature (weight -0.4)
w5·price- Electricity price (weight +0.2)
σ, μ- Sigmoid squash to 0–100, centered on typical values
How it works, step by step
- Rate each input honestly — the Appliance Comparison score is only as good as your self-assessment.
- Watch the live score and note which factor the result panel names as your strongest driver.
- Read your band below — each range comes with a concrete recommended next step.
- Change one input to simulate a change in behavior and see how much the score moves — that sensitivity is the real insight.
- Re-take the assessment after a few weeks; trends across readings mean far more than any single score.
Worked examples
A low-signal scenario
With every input set well below typical — the quiet version of this situation — the model returns 94, landing in the “Burning money politely” band. Your setup delivers heat about as fast and cheaply as physics allows for this volume. Nothing to optimize — enjoy the tea.
A high-signal scenario
Push the main drivers well above typical and the score rises to 94 — the “Burning money politely” band. This combination of volume and power is a scheduled activity, not a wait. Plan around it, batch it, or upgrade the wattage — the calculator quantifies each option.
How to read your score
Frequently asked questions
How does the Appliance Comparison Calculator work?
Pure energy balance: water mass × 4,186 J/kg·K × temperature rise, divided by your appliance’s real delivered power (rated watts × efficiency). The cost figures multiply the same energy by your local electricity price.
Does salt make water boil faster?
No — a teaspoon per litre raises the boiling point by roughly 0.17°C, thermodynamically negligible. Add it for flavor. Starting with hot tap water is the actual shortcut, with the caveat that some plumbing makes that inadvisable for drinking water.
Which appliance heats water most efficiently?
Electric kettles and induction (~85%) lead, microwaves deliver ~90% of their output but at lower power, electric coils run ~75%, and gas burners waste roughly 60% of their heat around the pan — though gas is often cheaper per kWh, which the calculator lets you compare honestly.
Is anything stored?
No — all thermodynamics runs locally in your browser.
Does putting a lid on really help?
On a stovetop, typically 15–25% faster by suppressing evaporative losses — free speed. Kettles are effectively sealed already, which is part of why they win.
Why does waiting feel so much longer than the timer says?
Attention dilates perceived duration — the watched-pot effect is real psychology. The felt-time output applies your impatience factor; the cure is leaving the room, which is free.