Gas Geyser vs Electric: Which Should You Actually Buy?

Gas geysers are widely said to be cheaper to run than electric ones, almost always without a number attached. We computed it, from HP Gas’s published city cylinder prices and two state tariff documents read on 13 September 2026. The claim is true. It is also close to meaningless as a general statement, because the saving swings from 18 paise a bath to ₹6.00 a bath on something that has nothing to do with the geyser: the electricity slab your household already sits in.

In Bengaluru the gas saving is 18 paise a bath. On Mumbai’s 101 to 300 unit slab it is ₹3.07, and above 500 units ₹6.00. So this page is a lookup, not a verdict.

The short answer

Look up your electricity slab before you look at appliances. On a flat state tariff like Karnataka’s, gas saves about 18 paise a bath, a thin margin to set against an appliance Racold tells you to install outside the bathroom. On Maharashtra’s 101 to 300 unit slab, gas is 57% cheaper per bath and the saving is real. If you do buy gas, ventilation is not a tip. It is the condition the Indian Standard prints in red on the front of the body.

How a gas geyser and an electric geyser actually differ

Gas geysers run on LPG cylinder gas or piped natural gas; Racold sells its Eco Instantaneous unit as an LPG/PNG appliance. IS 15558:2005 covers LPG appliances for “instantaneous and continuous production of hot water for domestic use, of nominal useful less than 25 kW”. The electric storage side sits under BEE’s Schedule 10 labelling programme instead.

On speed, Bajaj Electricals describes its gas geyser only as “Fast, direct flame”, and no manufacturer page or manual we searched gives a gas heat-up time in minutes. The one standards-backed timing number is IS 15558:2005’s responsiveness clause: at nominal gas rate, adjusted to a 50 °C rise between inlet and outlet, the time to reach 90% of that rise “shall not exceed 25 s”. Bajaj Electricals’ own table gives 10 to 20 minutes for an electric storage unit’s initial heat-up.

Those last figures are one brand’s list prices on one day, not a market band. Tank or on demand heating is a separate decision this page does not answer.

Gas geyser vs electric: what one hot bath actually costs

Here is the entire calculation.

15 L of water is about 15 kg 15 kg x 25 °C x 1 kcal per kg per °C = 375 kcal 375 kcal / 860 kcal per kWh = 0.436 kWh (BEE conversion factor) 375 kcal / (12,500 x 0.85) = 0.0353 kg of LPG (BEE factor, Racold's published 85%)

Four assumptions, because changing any one changes the answer. A bath is 15 L raised 25 °C above inlet: our modelling choice, not a sourced constant, because no manufacturer, BEE schedule or BIS standard we searched publishes a bath volume or an Indian inlet temperature. LPG is HP Gas’s published city price for the 14.2 kg domestic refill on 13 September 2026. Electricity is the variable charge only, so fixed monthly charges are excluded, ₹150 per kW at BESCOM and ₹130 per connection at MSEDCL, because you pay those whether the geyser runs or not. The electric figure is energy delivered into the water, not drawn from the meter, because no manufacturer we searched publishes a point of use efficiency for an electric storage geyser.

Bengaluru. Against BESCOM’s flat rate, gas is cheaper by ₹0.18 a bath, about 7%, roughly ₹131 a year at two baths a day.

Mumbai. Against MSEDCL’s slabs in the table, gas at ₹2.34 is 3% cheaper on 1 to 100 units, 57% cheaper on 101 to 300, and 72% cheaper above 500. The appliance did not change. The slab did.

At 0.0353 kg a bath, a 14.2 kg cylinder yields about 402 fifteen litre draws.

This is a marginal energy cost comparison and nothing more. It excludes purchase price, installation, cylinder delivery, fixed charges, any subsidy, and the standing loss of an electric storage tank, which pushes the electric side up further: on BEE’s published star bands a 15 L tank left connected loses 0.46 to 0.68 kWh a day at the no-draw test condition. Those bands were last published as valid to 30 June 2017, so they are dated rather than current.

The safety question, answered from the standard

The mechanism. When an LPG appliance does not burn its fuel completely it releases carbon monoxide. Bengaluru West Division police, quoted by Bangalore Mirror on 12 December 2025, describe it accumulating “within minutes in a closed bathroom” because families “often shut doors and windows for privacy or security”. An emergency medical officer quoted by The Times of India on 14 December 2025 describes the same route: without ventilation, the fumes reduce oxygen levels in the body. Oxygen depletion is the paired mechanism.

What the standard requires. IS 15558:2005 does not leave ventilation to editorial opinion. Clause 27.1(f) requires the warning “For use in well ventilated areas only” on the front of the body of the appliance in red, and prominently on the outer package. Clause 17 caps the carbon monoxide to carbon dioxide ratio of exhaust gases at 0.02 at any consumption at which the burner is stable. The current edition is IS 15558:2024, per BIS’s June 2025 product manual, but that text is sold, not published, so every clause here comes from the 2005 edition.

What the record shows. Karnataka police figures reported by Bangalore Mirror on 12 December 2025: 40 deaths across 32 gas geyser incidents in Bengaluru and other parts of Karnataka, most victims found in sealed bathrooms. Deaths by year, as reported: 1 in 2019, 2 in 2020, 15 in 2021, 12 in 2022, 10 in 2023. That series is Karnataka only, it stops at 2023 although the report is from December 2025, and we found no national count beside it.

A closed bathroom in every case those reports describe.

The detail to act on when buying. Racold’s gas manual describes an ODS sensor that cuts the gas when oxygen around the heater falls below “the required standard for human safety”, then adds: “(Available in Eco ODS & Eco ODS+ models only)”. The oxygen depletion sensor is a model tier feature, not a range default. Racold’s own instruction is stricter than the standard: install the heater outside the bathroom in an open area, and if it must go in a closed bathroom, keep windows open or run the exhaust fan.

Electric geysers relocate the risk rather than deleting it: Racold warns that water above 50 °C at the tap “could cause serious scalds or even death from burns”, with children, the disabled and the elderly most exposed.

Hard water and scale, as the manufacturers schedule it

The maintenance schedules our sources publish for scale are written for electric storage units.

A. O. Smith publishes the mechanism: hard water’s calcium and magnesium salts leave “a white, chalky kind of salt deposit in the inner container and on the heating element” that “starts interfering with the efficiency of the water heater”. Racold and Havells confirm it independently, Racold naming limescale in its insufficient-heating checklist, Havells instructing a yearly element check for “No Scale Formation”. Scale also clogs the pressure relief valve, which both treat as a safety part, and Havells asks for its test lever to be worked every two months.

What nobody publishes is when to descale. Havells says it “should be done periodically” with no interval, A. O. Smith routes it to a maintenance contract with no stated frequency, Racold publishes a servicing interval of six months after the first year but not a descaling one, and Bajaj Electricals publishes no schedule. Four brands, no number. Both Racold manuals publish the consequence: “Tank Cleaning and De-Scaling of the product is chargeable.”

Two manufacturers publish the same anode interval, annually, and differ on the threshold: Racold uses a rod diameter below 7 mm, Havells more than 60% consumed. Racold’s tank and element warranty depends on that check. The same chemistry is visible in descaling an electric kettle, and our water purifier guide covers the upstream side.

Which geyser should you actually buy

Start with your bill, not the showroom. On a flat tariff like BESCOM’s, gas buys about ₹131 a year at two baths a day, set against a mandatory red warning label and a city LPG price you do not control. Above the first slab it inverts: on Maharashtra’s 101 to 300 unit band the same bath is 57% cheaper on gas, and it compounds with everything else you run at that marginal rate. Gas also earns its place if you lose power often, a use both Bajaj Electricals and Racold publish.

If you go gas, buy the ventilation and the sensor, not just the geyser. Check the red IS 15558 marking, treat Racold’s instruction to install outside the bathroom as the default, and confirm the specific model has an oxygen depletion sensor, because on Racold’s range it is the Eco ODS and Eco ODS+ only.

Buy electric if you are on a low flat slab, or if the bathroom cannot be ventilated. Then budget for the upkeep above: annual anode and element checks, the valve lever every two months, and a descale none of the four brands will schedule.

What we could not verify

We have domestic tariffs for two states, Karnataka and Maharashtra, both from the regulator’s or the distribution company’s own document. Delhi we could not source: BSES’s tariff pages load but show their tables only in the browser, and the newest BRPL document on DERC’s index is a true up order for FY 2022-23 rather than a retail schedule. Tamil Nadu failed the same way, so Delhi and Chennai appear here as LPG prices and never as a ₹ per kWh. Kerala and Telangana would not connect at all.

Every LPG price here is HP Gas’s, from one source only, for that reason: Indian Oil’s price page would not open for us, and Bharatgas’s price page gave an error. Indane and Bharatgas are usually within a rupee or two, but we have not confirmed it. These are pre subsidy prices.

The question we most wanted to answer and could not: whether your housing society can refuse you a gas geyser. No BIS standard, manufacturer page or government source we searched publishes RWA or municipal approval rules for gas geysers in Indian apartments. IS 15558 governs the appliance, not permission to site it. Our method is at how we research.