Renovating a bathroom, the water heater is the unavoidable big purchase. The gas-versus-electric debate plays out in nearly every household: gas gives instant, endless hot water for multiple showers in a row, but requires a gas line; electric plugs into any outlet and installs easily, but a tank model must preheat and has limited capacity. The difference is not just \"is gas or electricity cheaper\" — installation conditions, upfront cost, thermal efficiency, and lifespan all differ. Run the ledger and the answer depends on whether you have gas and how you shower.
Installation Cost: Gas Needs a Line, Electric Is Plug-and-Play
Start with installation. Gas water heater: the unit is $112 to $420, but installation is the heavy part — you need a gas line and hot/cold water plumbing, $70 to $280 of work; if the home has no gas at all, getting a line installed costs $280 to $700 (hookup plus piping), pushing the total past $840. Electric water heater: the unit is $70 to $280, plugs into an outlet, and needs only inlet/outlet connections, installation $14 to $42 — a total of $84 to $320. The electric unit's upfront advantage is enormous, especially in apartments without gas.
But installation is one-time; annual energy is the long-term line. Use the percentage calculator to work out the payback of the upfront gap: if gas saves $42 a year, a $420 gas-line premium takes about ten years to pay back — for renters or short stays, electric wins clearly; for homeowners staying 10-plus years with gas available, gas's long-term advantage emerges.
Annual Energy: Fuel Prices, Efficiency, and Hot-Water Use
Compare on one basis first. One cubic meter of natural gas holds about 36 megajoules — roughly 10 kWh of heat. At typical residential prices ($0.42 per cubic meter of gas and $0.08 per kWh), one kWh of gas energy costs about $0.042 versus $0.08 for electricity — gas looks half the price on unit cost alone. Now add efficiency: a gas heater converts 80 to 90 percent of fuel into hot water (some heat escapes in exhaust); a tank electric heater converts 90 to 95 percent but loses 10 to 20 percent of its stored heat to standby losses. Combined, gas typically delivers hot water 35 to 50 percent cheaper per liter than electric. Use the unit converter to normalize cubic meters versus kilowatt-hours before comparing, so the \"electricity is cheap\" instinct does not mislead you.
Concretely for a family of three using 100 to 150 liters of hot water a day (10 to 15-minute showers): a gas heater runs $4.20 to $7 a month in fuel, $50 to $84 a year; a tank electric heater runs $8.40 to $14 a month, $100 to $168 a year — a gap of $42 to $84 a year, $420 to $840 over ten years. But electric has an off-peak trick: with time-of-use metering, heating overnight at 30 to 50 percent off peak cuts the annual bill to $70 to $112, narrowing the gap to $20 to $28. Experience differs too: gas is instant and endless — multiple showers in a row with no waiting; a 50-to-80-liter tank gives 15 to 20 minutes of hot water, then needs 30 to 60 minutes to reheat — the \"waiting cost\" is real for long showers or busy households.
Lifespan and Maintenance: 8-10 Years for Gas, 6-8 for Electric
Lifespan and upkeep differ clearly. Gas heaters last 8 to 10 years, need periodic heat-exchanger descaling, and safety matters — proper exhaust venting and ventilation are mandatory to prevent carbon-monoxide risk. Electric tanks last 6 to 8 years, need annual descaling and a sacrificial anode rod every 2 to 3 years ($7 to $14), and the biggest failure is tank corrosion and leaks — choosing a brand with a long tank warranty (8 years plus) is the safer bet. Use the salary calculator to value the maintenance time: gas needs a service visit every six months or so, electric an annual clean plus anode swaps — the lifetime upkeep cost is similar; the difference is mostly which safety concern you watch.
Three household routes. First: gas available, owner-occupied, many showers or baths — a gas heater ($140 to $350 tier), instant and endless, saving $42 to $84 a year in energy; best long-term value. Second: apartment without gas, renting or short stay — an electric heater ($112 to $210 tier), plug-and-play, easy to move, and do not pay thousands to install a gas line for the sake of \"gas savings.\" Third: torn between the two — look at shower habits: one person, 10 minutes, not urgent — electric suffices; a family showering back-to-back with continuous demand — gas (if available) or a large tank (80 liters plus) paired with off-peak electricity. One final warning: confirm your electrical panel and gas line capacity before buying, and run the payback of the installation gap through the percentage calculator — a water heater lasts 8 to 10 years, and choosing wrong is expensive.
FAQ
Q1: Which is cheaper, gas or electric water heating?
Long-term, gas: for the same hot-water use, gas runs $50 to $84 a year versus $100 to $168 for electric — a $42 to $84 annual gap. Off-peak electric tariffs narrow it to $70 to $112. But count installation: a gas line costs $280 to $700, taking about ten years to pay back — electric wins for short stays.
Q2: Can I install a gas heater without a gas line?
Only after installing a gas line ($280 to $700 hookup plus piping) and meeting ventilation requirements (kitchen or balcony, not the bathroom). Not worth it for renters or short stays; for owners staying 10-plus years, the long-term energy savings can pay it back.
Q3: My tank runs out of hot water mid-shower. What can I do?
That is the tank's natural limit: 50 to 80 liters gives about 15 to 20 minutes of showering, then 30 to 60 minutes to reheat. Solutions: bigger tank (80 liters plus), higher set temperature mixed with cold, staggered shower times, or a fast-reheat mode. For long showers or large households, gas (or a tankless electric) is the better fit.
Q4: Are gas water heaters safe?
Safe when installed correctly: exhaust must vent outside, the unit must sit in a ventilated area (kitchen or balcony, never the bathroom), and gas leaks must be checked periodically. Mainstream units are power-vented or balanced-flue with automatic carbon-monoxide shutdown. Buy a reputable brand, use a professional installer, and replace after 8 to 10 years — risk is manageable.