KETTLE BOIL-TIME COMPARISON — YENRA
Guide: https://yenra.com/high-speed-tea-kettle/
Prepared: October 11, 2026

Purpose: record the conditions behind a published time or an observation
during ordinary kettle use. Follow each model's complete operating instructions.
Do not change wiring, bypass controls, insert probes into an operating kettle,
or exceed fill limits. Use models rated for the local electrical supply.

BEFORE COMPARING (complete for A and B)
Exact model and country/market: ___________________________________________
Manual or published test URL: ____________________________________________
Water volume (mL or L; specify units): ____________________________________
Minimum and maximum permitted fills: _____________________________________
Starting water temperature and units, or UNKNOWN: _________________________
Kettle starting condition (cooled/recently heated; scale condition): _______
Location/altitude if known: _______________________________________________
Electrical label: watts ______ voltage ______ frequency ______
Endpoint (e.g. normal automatic shutoff): _________________________________
Keep-warm setting and other active modes: _________________________________

ORDINARY-USE OBSERVATIONS
Measure starting water separately before filling, if measuring temperature.
Keep the lid secured during operation. Start timing when heating starts.
Use the stated visible endpoint; avoid comparing unlike endpoints.
Allow normal cooling between observations and follow the manual throughout.
Model A: date ______ time 1 ______ time 2 ______ time 3 ______ (seconds)
Model B: date ______ time 1 ______ time 2 ______ time 3 ______ (seconds)
Differences in conditions or unknowns: ____________________________________
If the conditions differ, keep the observations separate.

IDEALIZED CALCULATION — NOT A TESTED KETTLE RESULT
Example: 1.0 L water approximated as 1.0 kg; from 20 C toward 100 C;
constant power of 1,500 W; water specific heat approximated as 4,186 J/(kg C).
Temperature rise = 100 - 20 = 80 C.
Q = mass x specific heat x rise = 1.0 x 4,186 x 80 = 334,880 J.
Time = energy / power = 334,880 / 1,500 = 223.25 seconds, about 3 min 43 sec.
For 0.5 L with the same assumptions: 111.63 seconds, about 1 min 52 sec.
Use 0.5 L only if the appliance's minimum fill allows it.
Assumptions: all stated power reaches water, no vessel heating or heat loss;
100 C reference endpoint. Local boiling point and control behavior vary.
Actual switch-off times depend on the appliance and conditions.
Physics source: https://openstax.org/books/college-physics-2e/pages/14-2-temperature-change-and-heat-capacity

DECISION
My normal batch: ______ Is it within each model's fill range? _____________
Does the time difference matter for this routine? _________________________
Handling, controls, or cleaning factors that also matter: _________________
Questions still requiring evidence: ______________________________________