How much electricity does a geyser consume per hour?

A geyser consumes electricity equal to its wattage. A 2000 W (2 kW) geyser uses 2 units per hour while the heating element is on, a 3000 W geyser uses 3 units per hour, and a 1000 W geyser uses 1 unit per hour. The element switches off once the water reaches the set temperature, so a geyser rarely runs a full hour continuously.

How much does it cost to run a geyser per month?

For a family using about 30 litres of hot water a day heated by 35°C, a geyser uses roughly 1.4 units/day, or about ₹11/day and ₹330/month at ₹8 per unit. Heavier use (60 litres/day) roughly doubles this to about ₹660/month.

How much electricity does a geyser use per bath?

Heating about 15 litres for one bath by 35°C needs roughly 0.7 units of electricity, costing about ₹5–6 at ₹8 per unit. A bucket bath (about 15 litres) uses far less hot water than a shower, which can use 40–60 litres.

Does a higher wattage geyser use more electricity?

Not for the same hot water. The energy needed depends on the litres heated and the temperature rise, not the wattage. A higher-wattage geyser simply heats the water faster — it draws more power but for less time, so the units consumed are almost the same. Wattage affects heating speed, not total consumption.

How can I reduce my geyser electricity bill?

Lower the thermostat to 50–55°C, switch the geyser on only 15–20 minutes before use and off afterwards, insulate the tank and hot-water pipes, fix dripping hot taps, use a 5-star BEE-rated geyser, and consider a solar water heater which can cut water-heating electricity by 60–80%.

Is it cheaper to leave the geyser on or switch it on each time?

Switching it on only when needed is cheaper. Leaving a storage geyser on all day means the thermostat keeps re-heating the tank as it loses heat (standby loss), wasting units. Turn it on 15–20 minutes before a bath and switch it off after.

🔥 Quick: pick your geyser wattage

then set your hot water use below ↓

🔥 Water Heating Cost

Geyser / Water Heater Electricity Cost Calculator

See how many units your geyser uses and what it costs — per bath, per day and per month — for your hot water habits.

🔥 Geysers are a hidden winter bill spike. Left on all day a geyser keeps re-heating the tank and can quietly add ₹600–1,200 a month. Heating only what you use brings it right down.

Geyser Power (watts)

On the rating label — usually 1000–4500 W

Hot Water Used (litres/day)

1 bucket ≈ 15 L, 1 shower ≈ 40–60 L

Inlet Water Temp (°C)

Winter ~15, summer ~28

Set / Bath Temp (°C)

Electricity Tariff (₹/unit)

Days Used / Month

How This Calculator Works

Water heating energy depends on how much water you heat and by how many degrees — not on the geyser's wattage. Wattage only sets how fast it heats.

It takes about 1.16 watt-hours to heat 1 litre of water by 1°C. The calculator multiplies your litres by the temperature rise, adds a small allowance for heat loss, then applies your tariff.

💰 Related Calculators

❄️ AC Electricity Cost 🧾 Electricity Bill Calculator ☀️ Solar Rooftop Subsidy ⚡ Electricity Cost (kWh to ₹)

💡 Save on Hot Water

→ Set thermostat to 50–55°C, not max
→ Switch on 15–20 min before use, then off
→ Insulate the tank and hot-water pipes
→ Fix dripping hot taps
→ Consider a solar water heater

How Geyser Electricity Consumption Is Calculated

The electricity a geyser uses is the energy needed to raise your hot water from the incoming (inlet) temperature to the temperature you bathe at. It takes a fixed amount of energy to heat water, regardless of how powerful the geyser is — a bigger element just does it faster.

Energy (kWh) = Litres × 4.186 × (Set Temp − Inlet Temp) ÷ 3600 ÷ Efficiency Heating Time = Energy (kWh) ÷ Geyser Power (kW) Cost per Day (₹) = Energy × Tariff (₹/unit) Cost per Month (₹) = Cost per Day × Days Used

Worked Example — 30 litres, 35°C rise

30 L | Inlet 20°C → Set 55°C (ΔT 35) | 90% efficient | 2000 W | ₹8/unit

Energy = 30 × 4.186 × 35 ÷ 3600 ÷ 0.90 = 1.36 units/day
Heating time = 1.36 ÷ 2 = ~41 min/day
Cost = 1.36 × ₹8 = ₹10.9/day → ₹326/month

Geyser Running Cost Reference

Approximate monthly cost at 35°C temperature rise, 90% efficiency, ₹8/unit, 30 days.

Hot Water / Day	Typical Use	Units/Day	Cost/Month
15 L	1 bucket bath	0.68	₹163
30 L	2 bucket baths	1.36	₹326
45 L	3 baths / 1 shower	2.04	₹489
60 L	Family / shower use	2.71	₹652
100 L	Large family	4.52	₹1,086

* Approximate. Cold winter inlet water raises these; summer lowers them. Use the calculator above for your exact case.

Frequently Asked Questions

A geyser consumes its wattage in units per hour while the element is on: a 2000 W geyser uses 2 units/hour, a 3000 W uses 3 units/hour. But the thermostat cuts off once water is hot, so it rarely runs a full hour.

Using ~30 litres/day heated by 35°C, a geyser uses ~1.4 units/day — about ₹11/day or ₹330/month at ₹8/unit. Heavier use (60 litres/day) roughly doubles it to about ₹660/month.

Heating ~15 litres for one bath by 35°C needs about 0.7 units, costing ₹5–6 at ₹8/unit. A bucket bath uses far less hot water than a shower, which can use 40–60 litres.

Not for the same hot water. Energy needed depends on litres and temperature rise, not wattage. A higher-wattage geyser heats faster — more power for less time — so units consumed are almost the same. Wattage affects speed, not total consumption.

Lower the thermostat to 50–55°C, switch on only 15–20 minutes before use, insulate the tank and pipes, fix dripping hot taps, use a 5-star BEE-rated geyser, and consider a solar water heater (saves 60–80% of water-heating electricity).

Switching it on only when needed is cheaper. Leaving a storage geyser on all day makes the thermostat keep re-heating the tank as it loses heat (standby loss), wasting units. Turn it on 15–20 minutes before a bath and off after.

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