तातो पानीको ऊर्जा हिसाबPlan hot-water energy

गिजरले पानी तताउन कति समय र पैसा लिन्छ?How long and how much will your geyser take to heat water?

पानीको litre, सुरु र चाहिएको तापक्रम, heater watt र heat loss राख्नुहोस्। एक पटकको समय, unit र खर्चसँगै महिनाको अनुमान देखिन्छ।Enter water volume, starting and target temperatures, heater watts, and heat loss. See time, energy, cost per heat, and a monthly estimate.

पानी र गिजरWater and geyser

तताउने पानीWater to heat

Tank capacity होइन, वास्तवमा तताइने पानी राख्नुहोस्।Use the water actually heated, not automatically the tank rating.

Heater को rated powerRated heater power

Nameplate वा manual मा भएको input watt राख्नुहोस्।Enter the input watts shown on the nameplate or manual.

पानीको सुरु तापक्रमStarting water temperature

°C

चाहिएको तापक्रमTarget water temperature

°C

तातो पानीले पोल्न सक्छ। प्रयोगको तापक्रम सुरक्षित छ कि छैन जाँच्नुहोस्।Hot water can scald. Check that the delivery temperature is safe for users.

तताउँदाको heat lossHeat-loss allowance

Tank, pipe र वरिपरि जाने ऊर्जा। थाहा नभए 10% केवल नमुना हो।Energy lost through the tank, pipes, and surroundings. The 10% default is only an example.

तपाईंको बिजुली दरYour electricity rate

Rs/kWh

आफ्नो bill मा थप unit लाई लागू हुने हालको दर राख्नुहोस्।Use the current rate that applies to added units on your bill.

महिनामा कति पटक तताउने?Heating cycles per month

times

एक cycle भनेको माथि राखिएको litre लाई सुरु तापक्रमबाट target सम्म तताउनु हो।One cycle means heating the entered litres from the starting temperature to the target.

तताउने नतिजाHeating estimate

अनुमानित तताउने समयEstimated heating time38.7 minheater लगातार rated watt मा चलेको मान्दाif the heater runs continuously at rated watts

एक पटकको input ऊर्जाInput energy per cycle1.291 kWh

एक पटकको खर्चCost per cycleRs 12.91

पानीलाई चाहिने ideal heatIdeal heat into water1.162 kWh

राखिएको heat lossAllowed heat loss0.129 kWh

तापक्रम बढ्नेTemperature rise40.0°C

महिनाको ऊर्जाMonthly energy38.7 kWh

महिनाको अनुमानित खर्चEstimated monthly costRs 387

यो timer वा bill guarantee होइनThis is not a timer or bill guarantee

पानीको वास्तविक mass, voltage, thermostat cycle, tank मा बाँकी तातो पानी, standing loss, pipe loss र scale ले नतिजा बदल्छ। Heat-loss input अनुमान हो। Measured plug energy उपलब्ध भए त्यसलाई प्राथमिकता दिनुहोस्।Actual water mass, voltage, thermostat cycling, leftover hot water, standing loss, pipe loss, and scale change the result. The heat-loss input is an estimate. Prefer measured electrical energy when available.

हिसाब कसरी हुन्छ?How the calculation works

पानीको mass, specific heat र तापक्रमको फरकले ideal heat दिन्छ। Loss को भाग काटेपछि heater बाट चाहिने input energy आउँछ।Water mass, specific heat, and temperature rise give the ideal heat. Dividing by the useful fraction after losses gives the required heater input energy.

water mass kg ≈ water litres × 1 kg/L
temperature rise = target °C − starting °C
ideal heat kJ = mass kg × 4.184 kJ/(kg·°C) × temperature rise
ideal heat kWh = ideal heat kJ ÷ 3,600
input kWh = ideal heat kWh ÷ (1 − heat loss %)
heating time hours = input kWh ÷ heater kW
cost per cycle = input kWh × entered Rs/kWh
monthly cost = cost per cycle × heating cycles

1 litre पानीलाई 1 kg मानिएको छ। यो घरायसी planning approximation हो। Water density तापक्रमसँग अलि बदलिन्छ।One litre of water is approximated as one kilogram for household planning. Water density varies slightly with temperature.

नमुना हिसाबWorked example

25 L पानीलाई 15°C बाट 55°C पुर्‍याउने, 2,000 W heater, 10% heat loss, Rs 10/kWh र महिनामा 30 cycle को नमुना लिऔं। Loss र दर दुवै उदाहरण मात्र हुन्।Take 25 L of water heated from 15°C to 55°C by a 2,000 W heater, with 10% heat loss, Rs 10/kWh, and 30 cycles per month. Both the loss and rate are illustrative.

25 × 4.184 × 40 = 4,184 kJपानीलाई चाहिने ideal heatideal heat into the water

4,184 ÷ 3,600 = 1.162 kWhideal electrical-energy equivalentideal electrical-energy equivalent

1.162 ÷ 90% = 1.291 kWh10% loss सहित inputinput with 10% loss

1.291 ÷ 2 kW × 60 = 38.7 minअनुमानित समयestimated time

1.291 × Rs 10 = Rs 12.91एक पटकको energy chargeenergy charge per cycle

1.291 × 30 = 38.7 kWhमहिनाको ऊर्जाmonthly energy

स्रोत र मान्यताSources and assumptions

OpenStax Chemistry 2e, Energy Basics, checked 10 Sep 2026. The Rice University textbook gives q = c × m × ΔT and liquid-water specific heat as 4.184 J/(g·°C), equal to 4.184 kJ/(kg·°C).
NIST Guide to the SI, Appendix B.9, checked 10 Sep 2026. NIST lists 1 kWh = 3.6 MJ, or 3,600 kJ.
US Department of Energy, 2023 water-heater test procedure final rule, checked 10 Sep 2026. The procedure calculates water-heating energy from withdrawn water mass, specific heat, temperature rise, and recovery efficiency.
IEC 60379:2023, electric storage water-heater performance, checked 10 Sep 2026. It specifies performance measurement methods for household electric storage water heaters.
AEPC, Standards and Labeling, checked 10 Sep 2026. Nepal's AEPC lists electric geysers among appliances studied for energy-efficiency standards.
UK Health and Safety Executive, Scalding and burning, updated 14 Nov 2024 and checked 10 Sep 2026. Its care-setting guidance warns that hot water, especially above 44°C, can scald vulnerable users. This is safety context, not a Nepal installation rule.
Nepal Electricity Authority, Consumer Tariff Rates, checked 10 Sep 2026. Enter the rate applicable to added units on your current bill rather than treating one rate as valid for every user.

Specific heat र kWh conversion बाहेक 1 kg/L, 10% loss, 2,000 W, Rs 10/kWh र 30 cycle सबै नमुना input हुन्। आफ्नो temperature मापन, nameplate, bill र प्रयोगअनुसार बदल्नुहोस्।Apart from the cited specific heat and kWh conversion, 1 kg/L, 10% loss, 2,000 W, Rs 10/kWh, and 30 cycles are example inputs. Replace them with your measurements, nameplate, bill, and actual use.

तातो पानी र बिजुली दुवै जोखिम हुन्Hot water and electricity both need care

यो tool ले thermostat, thermal cut-out, pressure relief, earthing, cable, breaker, RCD/RCBO वा installation design गर्दैन। पानी हातले जाँचेर सुरक्षित नमान्नुहोस्। गिजरको manual पालना गर्नुहोस् र wiring तथा safety devices योग्य electrician बाट जाँच गराउनुहोस्।This tool does not design thermostats, thermal cut-outs, pressure relief, earthing, cables, breakers, RCD or RCBO protection, or installation. Do not assume water is safe by testing it with a hand. Follow the heater manual and have a qualified electrician check wiring and safety devices.